Monographs Details: Riccia chiapasensis Jovet-Ast
Authority: Bischler, Hélène, et al. 2005. Marchantiidae. Fl. Neotrop. Monogr. 97: 1--262. (Published by NYBG Press)
Description:Species Description - Thalli in gregarious patches; lobes 2-3 times forked, 7-8 mm long, 1.5-2.5 mm wide, truncate and slightly emarginate apically; dorsal side light green when dry. Median groove shallow and wide, hardly distinct. Pores bounded by 4-5 thin-walled cells. Ventral scales hyaline, small, not reaching lobe margins. Cross section of lobes 0.8-1 mm high, usually 2.5-3 times as wide as high; dorsal side obtuse laterally, without wings; flanks obliquely ascending; ventral side slightly convex; air chambers in 1 layer. Monoecious. Sporangia hardly bulging dorsally. Spores 84-96 µm diam., brown; wing irregular, 2-5 µm wide, undulate, crenulate, slightly thickened on margin, granulose; distal face with 9-12(-14) areoles of 7 µm diam, across diam., with thin, granulose, red-brown ridges and tubercles; proximal face with facets of 60-70 areoles, smaller than those of distal face, 1.5-2 µm diam., with a tubercle in each comer, triradiate scar weak.

Discussion:Riccia chiapasensis is distinguished from the other neotropical Riccia species by its spores having numerous areoles (60-70) on the proximal face.
Distribution:Mexico North America| Chiapas Mexico North America|