Studies in the Marchantiales (Hepaticae) from southern Africa. 8. The genus <i>Plagiochasma</i> (Aytoniaceae: Aytonioideae) and six local taxa

Abstract

A taxonomic account is given ot the genus Plagiochasma Lehm. & Lindenh. and its two subgenera. Micropvlum Bischl. and Plagiochasma. The first subgenus is represented in southern Africa by P. rupestre var. rupestre (J.R. & G. Forst.) Steph. and P. rupestre var. volkii Bischl.: the second by P. appendiculatum Lehm. & Lindenb. (newly recorded for the region). P. heccarianum Steph.. P eximium (Schiffn.) Steph. and P. microcephalum (Steph.) Steph. var. microcephalum. Descriptions and illustrations of these taxa together with distribution maps and a key to the subgenera and species are provided.

Keywords

• Hepaticae
• Marchantiales
• <i>Plagiochasma appendiculatum</i>
• <i>P. heccarianum</i>. <i>P. eximium</i>
• <i>P. microcephalum</i> var. <i>microcephalum</i>
• <i>P. rupestre</i> var. <i>rupestre</i>
• <i>P. rupestre</i> var. <i>volkii</i>
• southern Africa