bryophyta

1. Dr. Thirunahari Ugandhar
Head & Assistant Professor in Botany
BRYOPHYTA

5.  Oldest land plants on earth and have been
around for 400 million years or more
 They do not have true vascular tissue and are
therefore non-vascular plants
 Do not have roots, but have rhizoids, which are
relatively simple, sometimes multicellular
filaments of thin-walled cells that extend from the
photosynthetic tissue into the soil.
 Composed of haploid cells, containing only one set
of chromosomes Have a two-stage life cycle:
gametophyte and sporophyte
 There are about 25,000 species of bryophytes
Divided into three: moss, liverworts, and hornworts

12.  Meaning of Bryophytes: Bryophyta
 (Gr. Bryon = mass; phyton = plant), a division of
kingdom Plantae comprises of mosses,
Hornworts and Liverworts. They are groups of
green plants which occupy a position between
the thallophytes (Algae) and the vascular
cryptogams (Pteridophytes).
 Bryophytes produce embryos but lack seeds
and vascular tissues.
 They are the most simple and primitive group of
Embryophyta.
 They are said to be the first land plants or non-
vascular land plants (Atracheata). Presence of
swimming antherozoids is an evidence of their
aquatic ancestory

13.  Origin of Bryophytes:
 Nothing definite is known about the origin of Bryophytes
because of the very little fossil record. There are two
views regarding the origin of Bryophytes.
 These are:
(i) Algal hypothesis of the origin of Bryophytes.
(ii) Pteridophytean hypothesis of the origin of Bryophytes.
 Algal Hypothesis of Origin: There is no fossil evidence
of origin of Bryophytes from algae but Bryophytes
resemble with algae in characters like-amphibious
nature, presence of flagellated antherozoids and
necessity of water for fertilization.
 This hypothesis was supported by Lignier (1903), Bower
(1908), Fritsch (1945) and Smith (1955) etc. According to
Fritsch (1945) and Smith (1955) Bryophytes have been
originated from the heterotrichous green algae
belonging to the order Chaetophorales for e.g.,

15.  (ii) Pteridophytean Hypothesis of Origin:
 According to this hypothesis Bryophytes are
descendent of Pteridophytes. They are evolved from
Pteridophytes by progressive simplification or
reduction.
 This hypothesis is based on certain characters like-
presence of type of stomata on the sporogonium of
Anthoceros and apophysis of mosses similar to the
vascular land plants, similarly in the sporophytes of
some Bryophytes (e.g., Anthoceros, Sphagnum,
Andreaea) with some members of Psilophytales of
Pteridophytes (e.g., Rhynia, Hormophyton etc.)
 This hypothesis was supported by Scot (1911),
Kashyap (1919), Kidston and Lang (1917-21),
Haskell (1914) Christensen (1954), Proskaner

16.  Plant Body of Oedogonium:
 The thalloid plant body is green, multicellular
and filamentous. The filaments are unbranched
and cells of each filament are attached end to
end and form uniseriate row (Fig. 3.72A). The
filament is differentiated into 3 types of cells: 1.
Basal cell, 2. Apical and 3. Middle cells.
 1. Basal Cell: It is the lowermost cell of the fila-
ment. The cell is long, gradually narrowed and
towards the basal end it expands to form simple,
disc-like, multilobed or finger-shaped structure.
The cell is generally colourless, which performs
the function of fixation to the substratum and
called holdfast.

18.  Distribution of Bryophytes:
 Bryophytes are represented by 960 genera and
24,000 species. They are cosmopolitan in
distribution and are found growing both in the
temperate and tropical regions of the world at an
altitude of 4000-8000 feet.
 In India, Bryophytes are quite abundant in both
Nilgiri hills and Himalayas; Kullu, Manali, Shimla,
Darjeeling, Dalhousie and Garhwal are some of the
hilly regions which also have a luxuriant growth of
Bryophytes. Eastern Himalayas have the richest in
bryophytic flora. A few species of Riccia, Marchantia
and Funaria occur in the plains of U.P., M.P.
Rajasthan, Gujarat and South India.

19.  Habitat of Bryophytes:
 Bryophytes grow densely in moist and shady places and
form thick carpets or mats on damp soils, rocks, bark of
trees especially during rainy season.
 Majority of the species are terrestrial but a few species
grow in fresh water (aquatic) e.g., Riccia fluitans,
Ricciocarpos natans, Riella etc. Bryophytes are not
found in sea but some mosses are found growing in the
crevices of rocks and are being regularly bathed by sea
water e.g., Grimmia maritima.
 Some Bryophytes also grow in diverse habitats e.g.,
Sphagnum-grows in bogs, Dendroceros-epiphytic,
Radula protensa. Crossomitrium -epiphyllous,
Polytrichum juniperinum-xerophytic, Tortula muralis-on
old walls. Tortula desertorum in deserts, Porella
platyphylla-on dry rocks, Buxbaumia aphylla (moss),
Cryptothallus mirabilis (liverwort) are saprophytic.

23.  Distribution and Habitat of Marchantia:
 Marchantia, the most important genus of family
Marchantiaceae is represented by about 65 species.
The name Marchantia was given in honour of
Nicolas Merchant, director of botanical garden of
Gaston d’ Orleans in Blois, France.
 All species are terrestrial and cosmopolitan in
distribution. The species prefer to grow in moist and
shady places like wet open woodlands, banks of
streams, wood rocks or on shaded stub rocks.
These grow best after the forest fire in the burnt soil.
It is perhaps because of nitrification of soil due to
fire (Richard, 1958).

24.  డిస్ట్రిబ్యూ షన్ అండ్ హ్యూ బిటాట్ ఆఫ్ మచ్చ ంటియా:
 మార్ింటీయే, కుటంబం యొక్క మార్ింటీయేర
యొక్క అతి ముఖ్ూ మైన జాతికి చందినది 65
జాతులు.
 మార్
ి ంటియా అనే పేరు నికోలస్ మర్చ ంట్
గౌరవారధం ఇవ్వ బడింది, ఫ్రాన్స్ల ోని బ్
ల
ో యిస్ల
ో ని గాస్ిన్
డి ఓర్లోన్ల బొటానిక్ల్ గార్డెన్ డైర్డక్ ిర్.
 అనిి జాతులు పంపిణీలో భూమి మర్యు
కాస్లో పాలిటన్. ఈ జాతులు తేమతో కూడిన
అడవులు, ఫ్రపవాహ్యల ఒడ్డె, క్లప ర్ళ్ళు లేదా షేడ్ె
బ్
స్ి్ ర్క్సల వ్ంటి తేమ మర్యు చీక్టి ఫ్రపదేశాలో
ో
పెరుగుతాయి. దహన మటిిలో అటవీ అగ్ని తర్వ త
ఇది బాగా పెరుగుతాయి. బహుశా మంటను నేల
నిక్షిపతం చేయడం వ్లో కావ్చ్చచ (ర్చ్ర్ె, 1958).

26.  In India, Marchantia is represented by about 11
species (Chopra, 1943). Udar (1970) reported only 6
species from different parts of the country. These
species are commonly found growing’ in the
Himalayan region at an altitude of 4000-8000 feet.
Eastern Himalayan region particularly supports the
growth of these species.
 Some species are also found growing in plains of
Haryana, Punjab, Uttar Pradesh and hilly regions of
South India.
 Some of the common Indian species are M. palmata,
M. polymorpha, M. simlana etc. M. polymorpha is
most widely distributed species. M. polymorpha var
aquatic grows submerged in swampy meadows. The
thalli with gemma cups are found throughout the
year whereas the thalli with sex organs occur

27.  భారతదేశంలో, మార్చ స్ంయా సుమారు 11 జాతుల
(చోఫ్రపా, 1943) దావ ర్ సూచంచ్బడ్డతుంది.
 ఉడార్ (1970) దేశం యొక్క వివిధ ఫ్రపాంతాల నుండి
కేవ్లం 6 రకాల మాఫ్రతమే నివేదించంది. ఈ జాతులు
4000-8000 అడ్డగుల ఎతుతలో హిమాలయ ఫ్రపాంతంలో
పెరుగుతున్ని యి.
 తూరుు హిమాలయన్ ఫ్రపాంతం ముఖ్ూ ంగా ఈ
జాతుల పెరుగుదలకు మదదతు ఇసుతంది. హర్ూ న్న,
పంజా్, ఉతతరఫ్రపదేశ్ మర్యు దక్షిణ
భారతదేశంలోని కండఫ్రపాంతాలలో కనిి జాతులు
కూడా పెరుగుతున్ని యి.
 సాధారణ భారతీయ జాతులలో కనిి M. పాల్మో టా, M.
పోలిమోర్ా , M. రమోన్న మొదలైనవి. M. పాలీమోర్ా
విస్తృతంగా పంపిణీ చేయబడిన జాతులు. ఎం.
పాలీమోర్ా వే వాటర్ జలము ముర్కి గడిె
మైదాన్నలలో మునిగ్నపోతుంది. స్ంవ్తల రం పొడవున్న

28.  Gametophytic Phase of Marchantia: External
Features of Gametophyte:
 The plant body is gametophytic, thalloid, flat,
prostrate, plagiotropic, 2-10 cm. long and
dichotomously branched (Fig. 1 A).
 Dorsal surface: Dorsal surface is dark green. It has a
conspicuous midrib and a number of polygonal
areas called areolae.
 The midrib is marked on the dorsal surface by a
shallow groove and on the ventral surface by a low
ridge.
 Each polygonal area re-presents the underlying air
chamber.
 The boundaries of these areas represent the walls
that separate each air chamber from the next.

31.  Each air chamber has a central pore. The midrib
ends in a depression at the apical region forming an
apical notch in which growing point is situated (Fig.
28 B).
 Dorsal surface also bears the vegetative and sexual
reproductive structures. The vegetative reproductive
structures are gemma cup and develop along the
midrib. These are crescent shaped with spiny or
fimbriate margins and are about one eighth of a inch
in diameter (Fig. I A, 15).
 Sexual reproductive structures are borne on special
Stalked structures called gametophores or
gamctangiophores. The gametophores bearing
archegonia are called archegoniophores and that
bearing antheridia are called antheridiophores (Fig.
1 A, B).

33.  Ventral surface: The ventral surface of the thallus bears
scales and rhizoids along the midrib. Scales are violet
coloured, multicellular, one cell thick and arranged in 2-4
rows (Fig. 1 C). Scales are of two types:
 (i) Simple or ligulate (ii) Appendiculate. Appendiculate (Fig-
1 C, D) scales form the inner row of the scales close with
midrib. Ligulate scales form the outer or marginal row and
are smaller than the appendiculate scales (Fig. 1 C, E).
 Rhizoids are unicellular, branched and develop as
prolongation of the lower epidermal cells. They are of
two types:
 (i) Smooth-walled rhizoids, (ii) Tuberculate rhizoids. In
smooth-walled rhizoids both the inner and outer wall layers
are fully stretched while in tuber-culate rhizoids appear like
circular dots in surface view (Fig. 1 F). The inner wall layer
modifies into peg like in growth which projects into the cell
lumen (Fig. 1 H). The main functions of the rhizoids are to

35.  Vertical వ్ంతెన ఉపర్తలం:
 థాలస్ యొక్క వెడలుు ఉపర్తలం మధూ సా
ా యిలో ఉండే
ఫ్రపమాణాలు మర్యు భూక్ంపాలు ఉంటాయి. ఫ్రపమాణాలు
వైలెట్ రంగు, బహుళస్ముఫ్రదం, ఒక్ క్ణం మందపాటి
మర్యు 2-4 వ్రుస్లలో అమరచ బడి ఉంటాయి.
ఫ్రపమాణాలు ర్డండ్డ రకాలు: (i) సాధారణ లేదా లిగుూ లేట్
(ii) అనుబంధం. అపెండికుూ లేట్ ఫ్రపమాణాలు midrib తో
దగగరగా ఫ్రపమాణాల అంతరగత వ్రుస్ను ఏరు రుసా
త యి.
వెలుపలి లేదా ఉపాంత వ్రుస్ను ఫ్రపమాణాలు
కలిచేందుకు మర్యు అనుబంధ ఫ్రపమాణాల క్న్ని
చని వి. రజోయిడ్డో ఏక్వ్చ్నం, శాఖ్లుగా ఉంటాయి
మర్యు దిగువ్ ఎపిడెరో ల్ క్ణాల పొడిగ్నంపుగా అభివ్ృదిధ
చందుతాయి.
 అవి ర్డండ్డ రకాలు: (i) సూో త్-గోడలు ఉని భూగరభ
రస్వాదులు, ఉపర్తల దృష్టిలో వ్ృతా
త కార చ్తురఫ్రసాకార
చ్చక్క లు వ్ంటి టవెర్-కాలియులేట్ ర్జిజాయిడ్స్ల ో
క్నిపించేటపుు డ్డ మృదువైన గోడల పొరలో
ో లోపలి
ర్ స్

36.  Anatomy of the Gametophyte: A vertical cross
section of the thallus can be differentiated
photosynthetic zone and lower storage zone (Fig. 2
A, B, E).
 Upper Photosynthetic zone: The outermost layer is
upper epidermis. Its cells are thin walled square,
compactly arranged and contain few chloroplasts.
Its continuity is broken by the presence of many
barrel shaped air pores. Each pore is surrounded by
four to eight superimposed tiers of concentric rings.
(Fig. 2 B) with three to four cells in each tier (Fig. 2
D).
 Air pores are compound in nature. The lower tier
consists of four cells which project in the pore and
the opening of the pore looks star like in the surface
view (Fig. 2 C). The walls of the air pore lie half

37.  Gamatophyte యొక్క అన్నటమీ: Thallus యొక్క ఒక్
నిలువు ఫ్రకాస్ విభాగం కిరణజనూ జోన్ మర్యు
తకుక వ్ నిలవ జోన్ (Figure 2 A, B, E) ను వేరు
చేయవ్చ్చచ .
 ఉని త కిరణజనూ మండలం: వెలుపలి పొర ఎగువ్
ఎపిడెర్ో స్. దీని క్ణాలు స్ని ని గోడల చ్తురఫ్రస్ంగా
ఉంటాయి, కదిదపాటి బ్
కోోప్లపా
ో స్ిోను క్లిగ్న ఉంటాయి.
దీని కనసాగ్నంపు అనేక్ బార్డల్ ఆకారపు గాలి
రంఫ్రధాల ఉనికి దావ ర్ విర్గ్నపోతుంది.
 ఫ్రపతి రంఫ్రధం చ్చట్ట
ి న్నలుగు నుండి ఎనిమిది
ఎనిమిదింటిని క్లిగ్న ఉంటంది. (Figure 2 B) ఫ్రపతి
ఫ్రేణిలో మూడ్డ నుండి న్నలుగు క్ణాలు (Figure 2 D).
ఎయిర్ రంఫ్రధాలు ఫ్రపక్ృతిలో స్మేో ళనం. దిగువ్ ఫ్రేణి
న్నలుగు కోరోను క్లిగ్న ఉంటంది మర్యు ఇది
సూక్ష్ో రంఫ్రధంలో పూరతవుతుంది మర్యు
సూక్ష్ో రంఫ్రధం తెరవ్డం ఉపర్తల దృష్టిలో (నక్ష్ఫ్రతం

38.  Just below the upper epidermis photosynthetic
chambers are present in a horizontal layer (Fig. 2 B).
Each air pore opens inside the air chamber and
helps in exchange of gases during photosynthesis.
 These are chambers develop schizogenously
(Vocalized separation of cells to form a cavity) and
are separated from each other by single layered
partition walls. The partition walls are two to four
cells in height. Cells contain chloroplast. Many
simple or branched photosynthetic filaments arise
from the base of the air chambers (Fig. 2 B).

40.  Storage zone:
 It lies below the air chambers. It is more thickened in
the centre and gradually tapers towards the
margins. It consists of several lasers of compactly
arranged, thin walled parenchymatous isodiametric
cells. Intercellular spaces are absent.
 The cells of this zone contain starch. Some cells
contain a single large oil body or filled with
mucilage. The cells of the midrib region possess
reticulate thickenings. The lower most cell layer of
the zone forms the lower epidermis. Some cells of
the middle layer of lower epidermis extend to form
both types of scales and rhizoids (Fig. 2 B).

41. reproduction in Marchantia.
Vegetative Reproduction in Marchantia:
Vegetative propagation of Marchantia takes place
by the following methods:
(a) By progressive Death and Decay of the
Thallus:
Like Riccia, the vegetative propagation of
Marchantia is quite common which takes place
by the unlimited growth of the branches and
decay from the base. When the decay of cells
reaches dichotomy, the two lobes becomes
separated from each other and the each separa-
ted lobe forms independent plants

42. (b) By Adventitious Branches:
Vegetative propagation is also known to take
place by the development of adventitious
branches from the ventral side of the thallus or
even from the reproductive buds (e.g. M.
palmata). These branches, on separation from
parent thallus, grow into new plants.
(c) By Gemmae (Singular = Gemma):

43.  The most common method of vegetative
propagation is by specialised asexual multicellular
bodies, known as gemmae. They are borne in large
numbers in small receptacles called gemma cups
present on the dorsal surface of the thallus in the
midrib region.
 A gemma cup is about 2 mm in diameter and 3 mm
in height, the margins of which are hyaline, lobed,
spinuous or entire.
 Many small stalked gemmae develop on the floor of
the gemma cup. Each gemma is vertically attached
to the base of the gemma cup by a one-celled stalk.
 he gemmae are multicellular, biconvex, discoid
bodies constricted at the middle. The two notches in
the constriction possess a row of apical cells
showing two growing points.

45. Sexual Reproduction in Marchantia:
 In Marchantia, the production of sex organs is dependent on
environmental conditions like day length, humidity, excess of
nitrogenous substance, etc.
 The sex organs are borne on special stalked receptacles called
gametophores. The receptacles bearing male (antheridium)
and female (archegonium) sex organs are called
antheridiophore and archegoniophore or carpocephallum,
respectively.
 These are developed on separate plants, so that the
Marchantia is dioecious or heterothallic. Although, the
gametophores are erect branches, they are actually the direct
extension of the prostrate vegetative thallus.
 This is clearly evident from the dorsiventral nature of the
erect shoots with air chambers, air pores and rhizoids.

47. Antheridiophore:
 The antheridiophore (Figs 6.8 and 6.12) shows a 1-3
cm long prismatic stalk bearing at its apex a slightly
convex (peltate) disc which is usually a 8-lobed
structure. Each lobe represents the apex of a branch
along whose upper (dorsal) median line the
antheridia are borne in a row.
 The antheridia develop in a acropetal manner i.e.,
the oldest are being at the center and the youngest
ones towards the periphery.
 The antheridia are within the flask- shaped
antheridial chamber. Each antheridial chamber
contains a single antheridium. Each antheridial
chamber is separated from one another by air
chambers with air pores.

48. Development and Structure of Antheridium:
 The development of antheridium in Marchantia is similar to that of
Riccia.
 The antheridium develops from the antheridial initial, situated on the
dorsal surface of the disc of the antheridiophore. The antheridial initial
increases in size and a transverse division differentiates it to an outer cell
and a basal cell (Fig. 6.1 3A, B).
 The basal cell follows no further development. The outer cell later
undergoes transverse division forming a basal primary stalk cell and a
terminal primary antheridial cell (Fig. 6.13C). Eventually the antheridium
is formed from the primary antheridial cell. The basal primary stalk cell
however, forms the stalk of the antheridium (Fig. 6.13D-G).
 A mature antheridium has a short stalk and a globular body encircled by a
sterile jacket which encloses a number of sperm mother cells. A single
sperm mother cell forms two triangular androcytes, each of which
develops a biciliated sperm or antherozoid (Fig. 6.13H). The dehiscence of
antheridium in Marchantia is similar to that of Riccia.

50. Archegonium:
 Development and Structure of Archegonium: Like Riccia, the archegonia
of Marchantia also develop from a single superficial dorsal cell, called the
archegonial initial (Fig. 6.16A).
 The conical shaped initial cell becomes conspicuous, increases in size,
and projects above the surface.
 The initial cell divides by a transverse wall to form an upper (or outer)
primary archegonial cell and a lower (or inner) primary stalk cell (Fig.
6.16B).
 The primary stalk cell by a few irregular divisions forms a short but
distinct multicellular stalk of the archegonium. The primary archegonial
initial undergoes several phases of regular divisions to form the
archegonium (Figs. 6.16B-H).
 A mature archegonium (Figs. 6.15B) is a pendulous flask-shaped
structure with a short stalk, which attaches to the lower (ventral) surface
of the archegonial disc. A single archegonium has a basal swollen venter
containing an egg cell, a ventral-canal cell and a row of neck canal cells
inside the elongated neck.

53. Sporophyte:
Development of the Sporophyte:The fertilised egg
enlarges in size and fills up the cavity of the venter.
It invests itself immediately with a thin cellulose wall
and becomes the oospore or zygote which is the
mother cell of the sporophytic generation.
The zygote cell inside the venter divides first by a
transverse wall forming an outer epibasal cell and an
inner hypobasal cell (Fig. 6.17A). This is followed by
a second division at right angle to the first division
forming a quadrant of cells. The two upper epibasal
cells of the quadrant divide and re-divide to form the
capsule and the upper part of the seta.

58. Structure of the Mature Sporophyte:
The mature sporophyte of Marchantia (Fig. 6.18A) is differentiated into three parts
— foot, seta and capsule.
(a) Foot:
It is an expanded bulbous mass of cells at the base of the sporogonium, serves as an
absorbing and anchoring organ. It absorbs nutrients from the gametophyte.
(b) Seta:
It is a slightly elongated stalk that connects the foot to the capsule. The cells are
parenchymatous and elongated lengthwise. Thus, seta increases in length and pushes
the mature capsule out of the calyptra.
(c) Capsule:

59. (c) Capsule:
It is a yellow-coloured spherical structure, contains numerous spores and
elaters. The capsule is protected by three coverings viz. calyptra perigynium and
perichaetium.
Dehiscence of the Capsule:
The jacket of the hanging mature sporogonium (capsule) gets dried and splits
longitudinally into a variable number of longitudinal lobes (Fig. 6.18B). These
lobes extend from the apex to the middle of the capsule. The discharge and
dispersal of sport to the air are assisted by the coiling and uncoiling of the
elaters due to their hygroscopic nature.
The spores are almost rounded and are very minute in size (12 to 30 µm in
diameter) with a thin inner intine and a slightly thicker outer exine (Fig. 6.18D).
In some species an additional layer called perispore is also found outside the
exine.