Rhoicosphenula paradoxa (Lange-Bert.) Lange-Bert., Kociolek, A.A.Saber & Cantonati, comb. nov.

(Figs 2, 3)

Gomphosphenia paradoxa Lange-Bert., Nova Hedwigia, 246, pls I-III (1995).

REGISTRATION. — http://phycobank.org/102719

Distribution

This is the type species of this still monotypic genus. It was collected from the Neotropical, black-water River Tec in Venezuela, at 1200 m a.s.l., in the surroundings of the Roraima Tepui, a table-top mountain formed by remains of a large sandstone plateau that once covered the granite bedrock. Besides R. paradoxa comb. nov., the type material includes several representatives of the genera Eunotia, Actinella, and Brachysira, as well as other species indicating high humicacids content.