Abstract
Pogotrichum filiforme Reinke, currently referred to as Litosiphon filiformis (Reinke) Batters, and Leptollematella fasciculata (Reinke) Silva have been studied under various sets of culture conditions through several successive generations. In Pogotrichum a simple life history has been found with swarmers from the plurilocular sporangia in the prostrate and erect parts of the thalli giving rise to new plants of similar morphology. The genus Litosiphon is typified with L. pusillus (Carm. ex Hook.) Harv., and the type species is compared with the species studied in culture. The two are found to differso much that resurrection of the old generic name Pogotrichum is suggested for the latter. The systematic position of Pogotrichum is discussed with special emphasis on the possibility of placing algae of this type at the beginning of the brown algal system, and a new family, Pogotrichaceae, is proposed. Unilocular sporangia in Leptonematella fasciculata have been found in culture for the first time. They occur only at low temperature and short day conditions. A closer taxonomic relation between Leptonematella and Pogotrichum is suggested.
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