Riccia mauryana Steph.

  • Authority

    Bischler, Hélène, et al. 2005. Marchantiidae. Fl. Neotrop. Monogr. 97: 1--262. (Published by NYBG Press)

  • Family

    Ricciaceae

  • Scientific Name

    Riccia mauryana Steph.

  • Type

    Type. D. F.: Cerro de Guadalupe, Maury (3228) (holotype, G).

  • Synonyms

    Riccia andina Müll.Frib., Riccia dorsiverrucosa Hässel

  • Description

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    Species Description - Thalli in gregarious patches; lobes 2-3 times forked, 3-10 mm long, l-2.5(-3) mm wide, rounded apically; dorsal side light green to grayish green, with narrow, hyaline margins; ventral side pale green or brownish. Median groove deep. Epidermal cells disintegrating, ovate-rounded where intact, with basal and lateral walls somewhat thickened, the basal granulose; hypodermal cells with ± thickened walls. Ventral scales hyaline, imbricate, lunulate, entire, of large cells (60-72 × 36-50 µm), bordered by smaller cells. Cross section of lobes 2-6 times as wide as high, 0.5-0.7 mm high; dorsal edge acute laterally; flanks obliquely ascending, or slightly concave, recurved and acute apically; ventral edge convex; dorsal tissue in 6-8 cell layers of large cells with 2 thickened walls or with thick, branched strips and a hyaline, thin, longitudinal strip. Dioecious? Spores subspherical, 67108 µm diam., red-brown with darker ornamentation, wingless, but sometimes with a narrow, incomplete and irregular, hyaline or yellowish strip; distal face with 7-14 areoles across diam., ridges thick, ± hidden by conspicuous tubercles; proximal face with incomplete areoles with low ridges and small tubercles, triradiate scar weak.

  • Discussion

    Riccia mauryana belongs to the species group comprising R. vitalii, R. ridleyi, R. ekmanii, and R. weinionis, all with thickened cell walls in dorsal tissue. However, in these species the thickened longitudinal bands never extend over the entire walls, whereas in R. mauryana 2 walls are entirely or nearly entirely thickened, and the other walls show a narrow, longitudinal, hyaline strip.

    Hassel de Menéndez (1963) treated R. andina and R. dorsiverrucosa as distinct species but did not recognize R. mauryana.

  • Distribution

    Riccia mauryana is a species known from S United States (Texas (Schuster, 1992b)), Mexico (D. F., Guadalupe Is. (Clark, 1953), Hidalgo, Mexico, Oaxaca, Puebla, San Luis Potosí), Brazil (Pernambuco), and Argentina (Catamarca, Salta). The species is infrequent and has been collected on soil and soil over rocks (granitic or calcareous soil, lava), exposed in seepage areas, on water edges and along paths, or sheltered around tree bases in open forests, or under scrub, from 80 m to 2800 m.

    Pernambuco Brazil South America| San Luis Potosí Mexico North America| Distrito Federal Mexico North America| Hidalgo Mexico North America| México Mexico North America| Oaxaca Mexico North America| Puebla Mexico North America| Salta Argentina South America| Catamarca Argentina South America|