Taxilejeunea pulverulenta (Lejeuneaceae, Jungermanniopsida), a poorly known species from the Neotropics, is transferred to Lejeunea

Lejeunea pulverulenta comb. nov. (basionym Taxilejeunea pulverulenta), a species known from Guadeloupe, Ecuador and Mount Roraima, Guyana is described and illustrated. The species is characterized by its yellowish-green and dull colour in the herbarium, cells with trigones, intermediate thickenings and strongly papillose and waterrepellent surface, small inflated lobules, imbricate and large underleaves with auriculate bases, gynoecia terminal on short branches with again fertile innovations, up to three gynoecia in a row.A comparison of Lejeunea pulverulenta with the morphologically closely related L. cerina and L. controversa is provided. Characteristics of the genus Taxilejeunea are briefly discussed. A lectotype for Taxilejeunea pulverulenta is designated.