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- Q1856753 subject Q8607987.
- Q1856753 abstract "Riccia is a genus of liverworts in the order Marchantiales.The plants are small and thallose, that is not differentiated into root, stem and leaf. Depending on species, the thallus may be strap-shaped and about 0.5 to 4 mm wide with dichotomous branches or may form rosettes or hemirosettes up to 3cm in diameter, that may be gregarious and form intricate mats.The thallus is dorsiventrally differentiated. Its upper (dorsal) surface is green and chlorophyll-bearing, with a mid-dorsal longitudinal sulcus (furrow or groove). Air pores occasionally break through the dorsal surface, giving the thallus a dimpled appearance.The lower (ventral) surface has a mid-ventral ridge bearing multicellular scales that originate as a single row but normally separate into two rows as the thallus widens. The scales are multicellular and hyaline (glassy) in appearance, or violet due to the pigment anthocyanin.Rhizoids are nearly lacking in aquatic forms, but there are usually numerous unicellular rhizoids of two types on the ventral surface. One type is called smooth and the other type is the pegged or tuberculated rhizoids; these help in anchorage and absorption. The inner surface of the smooth rhizoids is smooth while that of the tuberculate rhizoid will have internal cell wall projections.Plants are usually monoicous, and sexual reproduction is by antheridia and archegonia. Asexual reproduction occurs by spores, by fragmentation of the rosettes, and by formation of apical tubers. Spores are large (45 to 200 µ) and formed in tetrads.One of the more than 100 species in this genus is the "slender riccia" (Riccia fluitans), which grows on damp soil or, less commonly, floating in ponds, and is sometimes used in aquariums.".
- Q1856753 class Q189808.
- Q1856753 division Q189808.
- Q1856753 family Q146314.
- Q1856753 kingdom Q756.
- Q1856753 order Q139099.
- Q1856753 thumbnail Riccia_huebeneriana_Lindenb._Kohatakegoke.JPG?width=300.
- Q1856753 wikiPageWikiLink Q1043.
- Q1856753 wikiPageWikiLink Q1129321.
- Q1856753 wikiPageWikiLink Q128700.
- Q1856753 wikiPageWikiLink Q133697.
- Q1856753 wikiPageWikiLink Q139099.
- Q1856753 wikiPageWikiLink Q146314.
- Q1856753 wikiPageWikiLink Q150053.
- Q1856753 wikiPageWikiLink Q175821.
- Q1856753 wikiPageWikiLink Q177332.
- Q1856753 wikiPageWikiLink Q183319.
- Q1856753 wikiPageWikiLink Q189808.
- Q1856753 wikiPageWikiLink Q207495.
- Q1856753 wikiPageWikiLink Q262547.
- Q1856753 wikiPageWikiLink Q291512.
- Q1856753 wikiPageWikiLink Q43177.
- Q1856753 wikiPageWikiLink Q45782.
- Q1856753 wikiPageWikiLink Q5463681.
- Q1856753 wikiPageWikiLink Q753457.
- Q1856753 wikiPageWikiLink Q756.
- Q1856753 wikiPageWikiLink Q850653.
- Q1856753 wikiPageWikiLink Q8607987.
- Q1856753 wikiPageWikiLink Q908438.
- Q1856753 wikiPageWikiLink Q944420.
- Q1856753 classis Q189808.
- Q1856753 divisio Q189808.
- Q1856753 familia Q146314.
- Q1856753 name "Riccia".
- Q1856753 ordo Q139099.
- Q1856753 regnum "Plantae".
- Q1856753 type Eukaryote.
- Q1856753 type Moss.
- Q1856753 type Plant.
- Q1856753 type Species.
- Q1856753 type Thing.
- Q1856753 type Q19088.
- Q1856753 type Q756.
- Q1856753 comment "Riccia is a genus of liverworts in the order Marchantiales.The plants are small and thallose, that is not differentiated into root, stem and leaf. Depending on species, the thallus may be strap-shaped and about 0.5 to 4 mm wide with dichotomous branches or may form rosettes or hemirosettes up to 3cm in diameter, that may be gregarious and form intricate mats.The thallus is dorsiventrally differentiated.".
- Q1856753 label "Riccia".
- Q1856753 depiction Riccia_huebeneriana_Lindenb._Kohatakegoke.JPG.
- Q1856753 name "Riccia".