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

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.

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