TAXONOMIC AND NOMENCLATURAL STATUS OF TROCHISCIA KUTZING AND TROCHISCIA-MONILIFORMIS MONTAGNE

Trochiscia moniliformis Montagne (1838) was published as a marine spec ies of the freshwater genus Trochiscia Kutzing (1834). Accrediting Mon tagne with having established a genus of diatoms bearing the name Troc hiscia is erroneous. The genus Podosira Ehrenberg (1840) is based on T . moniliformis. The correct name of this species is P. hormoides (Mont agne) Kutzing. The current treatment of Trochiscia as a genus of chlor ococcalean algae is supposedly based on Kutzing's second use of the na me (1845), but none of the four original species is identifiable. Ther efore, the name should be rejected not only because it is a later homo nym, but because its taxonomic application is uncertain. The name Gloc hiococcus De Toni (1888) is available for certain species originally a ssigned to Acanthococcus Lagerheim (1883) (not Acanthococcus Hooker f. & Harvey 1845 in the rhodophycean family Cystocloniaceae) and subsequ ently transferred to Trochiscia.