Original Research

Studies in the genus Riccia (Marchantiales) from southern Africa. 11. Riccia montana and R. alboporosa, a further two new white-scaled species of the group ‘Squamatae’

S. M. Perold
Bothalia | Vol 19, No 1 | a934 | DOI: https://doi.org/10.4102/abc.v19i1.934 | © 1989 S. M. Perold | This work is licensed under CC Attribution 4.0
Submitted: 17 October 1989 | Published: 18 October 1989

About the author(s)

S. M. Perold, Botanical Research Institute. Department of Agriculture and Water Supply, South Africa

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Abstract

Another two new endemic species of the subgenus  Riccia. section  Riccia. group ‘Squamatae , are described:  R. montana and R alboporosa. The distribution of R montana is apparently restricted to high altitudes in the Drakensberg and Witteberg Mountain ranges. The species is characterized by ligulate branches, finely spongy dorsal surface and hyaline to white, calcium-encrusted scales.  R alboporosa is found in Namaqualand. but it is rare It can be recognized by the distinctly porous appearance of the dorsal surface due to the presence of large. ± regularly spaced air pores, which are encircled by six or seven radially arranged, wedge-shaped cells that become white on drying, hence the specific epithet.


Keywords

air pores, anatomy, calcium salts, distribution, endemic, rare, reticulation, scales, spore ornamentation

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