This is the first of several projected articles on the taxonomy of southern African Metzgeriaceae H. Klinggr. A brief history of the genus Metzgeria Raddi in southern Africa, the only local representative, is presented. Family and genus descriptions, as well as a key to the species, are provided. Of the seven species currently recognized in southern Africa, M. nudifrons is the only species with gemmae on the dorsal surface of the thallus. It is also characterized by the distinctly broad costa, hairy male branchlets as well as single and straight hairs on the ventral face and margins of the thallus. Metzgeria nudifrons is described, illustrated and its geographical distribution mapped.
Paulo E.A.S. Câmara, Jacques van Rooy, Micheline Carvalho Silva and Robert E. Magill
In the Flora of southern Africa area, comprising the countries of South Africa, Namibia, Botswana, Lesotho and Swaziland, the moss family Sematophyllaceae consists of three genera (Trichosteleum, Donnellia and Sematophyllum) and nine species. Core sematophyllous taxa with collenchymatous exothecial cells, long rostrate operculum, linear leaf cells and differentiated alar cells are included in the family. Meiothecium fuscescens is transferred to Donnellia and a new combination made. Sematophyllum wageri is reduced to synonymy under S. brachycarpum and a lectotype is designated for S. dregei. Each species is described and its distribution mapped.