Monographs Details: Riccia erythrocarpa Jovet-Ast
Authority: Bischler, Hélène, et al. 2005. Marchantiidae. Fl. Neotrop. Monogr. 97: 1--262. (Published by NYBG Press)
Family:Ricciaceae
Description:Species Description - Thalli in gregarious patches, with unpleasant smell; lobes 1-2 times forked, 4-6 mm long, 0.7-1.1 mm wide, obtuse apically; dorsal side light green with narrow, light brown margins; flanks inflexed when dry, violet; ventral side violet. Median groove shallow, only apically distinct. Epidermal cells disintegrating, basal walls strongly thickened. Ventral scales reaching lobe margins, hyaline, or violaceous with hyaline margins. Rhizoids pinkish. Cross section of lobes 0.9 mm high apically, 0.55-0.6 mm high in older parts, 1-1.5 times as wide as high; dorsal edge ending laterally in a peak of 2 hyaline uniseriate cells with thickened walls; flanks ascending and convex, with wide, red-violet strip in inner layers and narrow, pink-violet strip in outer layer; ventral edge convex; cells of dorsal and ventral tissue thin-walled. Dioecious? Spores subspherical, 100-136 µm diam., red-brown or red, with dark black-red ornamentation, wingless; distal face with 10-12 (-14) complete areoles across diam., with thick, sometimes anastomosing ridges, or areoles incomplete with thick, sinuose ridges and large tubercles; facets of proximal face with subhexagonal areoles with thick ridges and ± anastomosing tubercles, or with incomplete areoles and vermiculate thickenings, or with strong tubercles, triradiate scar weak.

Discussion:Riccia erythrocarpa is distinguished by the cross section of lobes, which are nearly as wide as high, and the strong thickening of the basal walls of the epidermal cells. The species shares this latter characteristic with R. sorocarpa; however, in R. sorocapra all walls of the epidermal and hypodermal cells are thickened (in R. erythrocarpa only the basal wall of the epidermal cells). Additionally, the spores of the 2 species are different, having a conspicuous wing in R. sorocarpa but lacking one in R. erythrocarpa.
Distribution:Bahia Brazil South America|