Marchantiales - Govt. Victoria College

Marchantiales - Govt. Victoria College

Marchantiaceae
Dr. Maya C Nair
DEPARTMENT OF BOTANY
Govt. Sanskrit College, Pattambi
Marchantiaceae
 Have stalked carpocephala
 Well developed air chambers (Except
Dumortiera) , single or superposed multi
layered
 Well developed air pore
 Well developed air chambers in male and
female receptacles
 Sporogonium
with foot, seta and
capsule
 Well developed elaters
CLASSIFICATION OF
MARCHANTIACEAE(Cavers, 1981)
Marchantiaceae
Astroporae
 Operculatae
 Compositae
Marchantia polymorphaMarchantiaceae
Asterella
Asterella male
Dumortiera
Dumortiera
Dumortiera hirsuta- Marchantiaceae
Marchantia
Dichotomously branched, broader and
dorsiventrally flattened thallus
 Prominent midrib
 Special vegetative propagules, the gemmae in
gemma cup
 Well developed air pores
 Tuberculate and smooth rhizoids
 Ventral multicellualar scales for protection
Ventral surface of Marchantia thallus
Marchantia polymorpha
Marchantia is dioecious
1. Female plant with archegoniophores
2. Male plant with antheridiophores
3. Gemmae cups
4. Dorsal surface of thallus showing air
chamber outlines and pores
Marchantia - thallus structure

Pore
Pores
Photosynthetic
tissue
Rhizoids
Scale
Storage tissue
Rhizoids
 Photomicrograph of cross-section
 Drawing of cross-section
Reproduction in Marchantia
• Vegetative
–Fragmentation
– Formation of adventitious branches
– By gemmae in gemmae cups
• Sexual reproduction
–antheridiophore with antheridia
– archegoniophore with archegonia
Marchantia - Vegetative Reproduction by Gemmae
Single gemma,
with meristems
in notches
Gemmae
Gemma cups on dorsal
surface
Longitudinal section through gemma cup
Marchantia - Sexual Reproduction
Antheridia and Antheridiophores

Male thallus
Sterile jacket
layer
Male thalli with
antheridiophores
from above
Drawing of
longitudinal section
through
antheridiophore,
showing sunken
antheridia & air
chambers
Spermatogenous
tissue
Stalk
Longitudinal section of
antheridium
Marchantia
Archegonia and Archegoniophores
Stalk
Venter
Egg
Female thalli with
archegoniophores
Female
thallus
Drawing of
longitudinal
section through
archegoniophore,
showing inverted
archegonia & air
chambers
Neck canal
cells
Longitudinal section
of archegonia
Marchantia Female thalli with sporophyte
Marchantia - Sporophyte, Sporangium and Spores
Longitudinal section of sporophyte
Lunularia
Marchantia