Systematic position: Division : Bryophyta- The true grow are always absent, they lack vascular tissues and homosporous. Class class Hepaticopsida: -Gametophyte dorsiventrally differentiated thallus, chloroplasts devoid of paranoids, rhizoids without septa. Order : Marchantiales- Ventral portion of thallus parenchymatous ,scales and rhizoids bow on the ventral side of thallus ,rhizoids smooth walled and tuberculate. Family Ricciaceae,: Rosette deal ,dichotomously weaponed thallus ,sex organs in the middledorsal groove,sporogonium simple capsule and not differentiated into foot, seta, and capsule. .Genus: Riccia:- Thallus usually rosette like,scales present on the margins, assimilatory filamentous are vertical and unbranched. Habitat or occurrence: The genus Riccia with about 200 species, is cosmopolitan in its distribution and ordinarily grows in moist soils especially during the after rains .About 29 species make believe reported from different parts of India. Riccia belongs to the common Indian
species are Riccia siliata, R. hitra, R. discolor, R. glauca, R. gan start upica, R. melansspora, R. hirta, R.crystallina absolute majority of the species are terrestrial, a few are free adrift(p) or submerged aquatics e. g. R. fluitans, R. natans. The plant R. crystallina occurs at an meridian of 14,000 ft.
in Western Himalayas. External morphology(Gametophyte phase) In Riccia, the gametophytic plant consistency is the dominant phase in the life cycle. The gametophyte is a prostrate, dorsi-ventrally flat, dichotomously branched, green, fleshy thallus. each(prenominal) branch is either linear or wedge-shaped or obcordate and as the dichotomous branches grow in concert from one place, the plant usually exhibits a shape of a rosette or a circular patch. Each branch is thick in the median region and thin towards the margin. Each branch shows a conspicuous, longitudinal furrow along the mid a notch at the tip where the growing chief is located. On the ventral surface are present...If you want to get a full essay, order it on our website: Ordercustompaper.com
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