Arnell, Marchantiales, Riccia albolimbata, R. albosquamata, white scales

Abstract

Arnell s (1957. 1963) inadequate descriptions, poor drawings, mistakes in the text and key. as well as mixed collections, have all contributed to the confusion regarding the identity of his species  R albolimbata and  R albosquamata.  Volk s collections (Arnell 1957) of the latter consist mostly of two white-scaled species in the same packet: one is  R. albolimbata and the other is R argenteohmbata Volk & Perold (Volk  et al. 1988). Evidently Amell used characters of both plants to describe  R. albosquamata. although the type specimen.  Volk 452. consists of only  R albolimbata (plus fragments of  R atropurpurea Sim and  R. trichocarpa Howe).  R albosquamata is accordingly to be regarded as a taxonomic synonym of R albolimbata.