Variations in Plants Part- 2

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IMPORTANT EXAMPLES OF LIVERWORTS : IMPORTANT EXAMPLES OF LIVERWORTS The thallus is dorsiventrally ribbon like. Riccia fluitans is only aquatic species. Rhizoids are unicellular and are of two types : 1. Smooth walled 2. Tuberculated

Slide 2 : Dorsal side of thallus has vertical air chambers. The capsule is composed of single layer of sterile cells. Nurse cells are formed along with spores instead of elaters

Marchantia…Liverwort : Marchantia…Liverwort Bear both sex organs on different thalli, therefore, are dioecious. In Marchantia, archegonia form on the underside of rays protruding from the umbrella-shaped caps of archegoniophores (archegonium

Slide 4 : Antheridia form in chambers along the upper side of disc-shaped caps of antheridiophores (antheridium bearers). Asexual reproduction occurs by Gemmae or CUPULES. Spores are dispersed by Elaters in capsule which exhibit hydrochasy. Amphigastria present on ventral side.

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