Norris D.H.1,2, Ignatov M.S.3 2000. Observations on stem surface anatomy in Climacium and Pleuroziopsis (Climaciaceae: Musci) // Arctoa. Vol. 9: 151–154 [in English].

1 University Herbarium, University of California, Berkeley 94720 U.S.A.

2 Botanical Museum, University of Helsinki, Box 47, SF 00014, Helsinki, Finland

3 Tsitsin Main Botanical Garden of Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia

KEYWORDS: Pleuroziopsis, Climacium, Climaciaceae, taxonomy, morphology, paraphyllia.

ABSTRACT. Pleuroziopsis was segregated from Climaciaceae into a separate monotypic family Pleuroziopsidaceae by Ireland (1968). According to Ireland, the most important and unique characteristic of Pleuroziopsis is a fluting of the stem by streaks of stem lamellae. However, this pattern of stem fluting is shown to be shared with the genus Climacium, so Pleuroziopsis is returned to Climaciaceae.

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