Riccia a genus of liverworts that boasts unique features and ecological significance. This presentation offers a comprehensive exploration of Riccia's biology, habitat, and importance in various ecosystems. Discover the intricate structures, reproductive strategies, and ecological roles that make Riccia a fascinating subject in the world of botany. Whether you're a seasoned biologist or a nature enthusiast, this presentation promises insights into the hidden wonders of Riccia.

1. RICCIA
M A H E K S I R A J I N A M D A R &
D R . N I S H A C H O U D H A R I
This Photo by Unknown Author is licensed under CC BY-NC-ND

5. R I C C I A :
• Thallus present in rosette shaped
structures.
• All scales are alike and present on
margins
• Presence of only capsule without foot
and seta.

7. . All species are terrestrial and prefer to
grow on moist and shady places except Riccia fluitans, which is an aquatic species and
occurs floating in still stagnant water or submerged below the surface of standing water.

10. Figure: Vertical cross-section of the Riccia thallus showing
internal tissue differentiation

11. https://www.inaturalist.org/observations?place_id=any&taxon_id=53014&view=species
https://blogs.ubc.ca/biology321/?page_id=6956
https://www.researchgate.net/publication/260246718_Riccia_Hepaticae_Ricciaceae_of_West_Bengal
https://www.researchgate.net/publication/362832190_OCCURRENCE_OF_RICCIA_CAVERNOSA_HOFFM_IN_SATP
UDA_RANGE_OF_MAHARASHTRA_INDIA

15. Figure: Different stages of antheridium development in
Riccia

19. Figure: L.S. of Riccia mature archegonium

21. Figure: Development of
sporophyte in Riccia

23. Spore :
The spores are haploid, uninucleate, and pyramidal in shape. They are very small, 0.05 to 0.12 mm in diameter.
Each spore remains surrounded by three wall layers: the outermost exosporium, the middle mesosporium, and the innermost
endosporium.
The outermost exosporium, or perispore, is thin, mucilaginous, ornamented, and very strongly cutinized. The middle-layer
mesosporium is differentiated into 3 concentric zones. The innermost endosporium is composed of cellulose and pectose.