Ditrichum austrogeorgicum: a synonym of D-hyalinum (Musci, Ditrichaceae)

Ditrichum austrogeorgicum (Card.) Seppelt, a species originally described i n 1906 from South Georgia as Pseudodistichium austrogeorgicum Card., is con sidered to be conspecific with Ditrichum hyalinum (Mitt.) O. Kuntze. The la tter had been first described in 1859 as Leptotrichum hyalinum Mitt. from m aterial collected on the Falkland islands and Hermite island near Cape Horn , but it had been first recognized as a separate taxon, Didymodon longifoli us (Brid.) Hook. f. & Wils. var, tenuifolius Hook. f. & Wils., in 1847. Pse udodistichium austrogeorgicum f. brevifolium Card. and P austrogeorgicum va r, longifolium Broth. in Card. & Broth. are reduced to synonymy with Ditric hum hyalinum. Some details of the type material of the last are illustrated (C) 1999 Adac/Editions scientifiques et medicales Elsevier SAS.