Evidence is presented for the occurrence of one species of Compsothamnionella on the coast of the eastern Cape Province, South Africa. Compsothamnionella is once more separated from Pleonosporium, the chief differences being: (i) a more complex cortication in Compsothamnionella, involving filaments that connect laterals of alternate segments, in contrast to absent cortication or of loose rhizoidal filaments not connecting laterals in Pleonosporium; (ii) development of the procarp on the second to fifth cell below the apex of the female fertile filament in Compsothamnionella, in contrast to Pleonosporium where the procarp develops on the subapical cell only. It is concluded that the tribal position of Compsothamnionella is intermediate between the Ptiloteae and the Compsothamnieae. The South African species is new to science, and the name C. sciadophila is proposed.

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Acta botanica neerlandica

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Koninklijke Nederlandse Botanische Vereniging

H. Stegenga. (1990). The genus Compsothamnionella Itono (Ceramiaceae, Rhodophyta) on the South African coast. Acta botanica neerlandica, 39(1), 93–99.