Marchantiales, Anthocerales and Polytrichales : A comparision

Marchantiales, Anthocerales and Polytrichales : A comparision

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  BRYOPHYTES Marchantiales, Anthocerales and Polytrichales Dr.K. Kannathasan Assistant Professor of Botany APA COLLEGE OF ARTS & CULTURE, PALANI 624 601
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  Marchantiales Polytrichales Distribution Widelydistributed Tropical and temperate countries Genus and Species 35 and 420 15 and 350 Examples Marchantia, Targionia, Reboulia, Riccia, Plagiochasma Polytrichum, Pogonatum, Atrichum, Oligotrichum, Lyellia Gametophyte External Strictly thallose Green, flat and thick, dichotomous branch Apical notch, Areole Smooth and tuberculate rhizoids, Scales Highly organised Leaf-distal limb and proximal sheathing base Lamellae Gametophyte Internal Two distinct region Photosynthetic and Storage region. Air pores and chambers present Epidermis, Cortex and Central Strand
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  Thallus ̶ External MarchantiaAnthoceros Polytrichum
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  Thallus ̶ Internal Marchantia Anthoceros Polytrichum Stem LeafRhizome
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  Sexual Reproduction Antheridiophore Anthoceros Polytrichum Marchantia Archegoniophore Antheridium Archegonium Antheridium Archegonium
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  SPOROPHYTE Marchantia Anthoceros Polytrichum
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  Marchantiales Polytrichales Asexual Reproduction Fragmentation (Riccia, Marchantia) Adventitiousbranches (Targionia, Riccia) Gemma(Marchantia, Lunularia) Tuber(Riccia) Vegetative buds (Bulbils) Death or breakage of rhizoids Sexual Reproduction Sex organs : dorsal, acropetal order Sessile or stalked Antheridia surrounded by perigonial cluster Archegonia surrounded perichaetial leaves Sporophyte Calyptra:cover Foot, seta and capsule Capsule wall single layer Elaters present Columella Operculum Peristome Capsule several layers
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