Ignatov M.S.1, Robinson H.1, Ignatova E.A.1 1998. Studies on the exostome of Brachytheciaceae (Musci) // Arctoa. Vol.7: 153–188 [in English].

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

2 Department of Botany, Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, U.S.A.

3 Biological Faculty, Moscow State University, Moscow 119234 Russia

KEYWORDS: bryophytes, mosses, perisome, papillae, SEM.

ABSTRACT. The exostome structure of Brachytheciaceae was studied with the scanning electron microscope. 63 species of 17 genera were involved: Brachythecium (21 species), Bryoandersonia (1), Camptothecium (2), Cirriphyllum (1), Eurhynchiella (1), Eurhynchium (9), Homalotheciella (1), Homalothecium (5), Myuroclada (1), Palamocladium (2), Platyhypnidium (4), Rhynchostegiella (6), Rhynchostegium (5), Scleropodium (2), Scorpiurium (1), Steerecleus (1). Rhynchostegiella, Homalothecium and Homalotheciella have many advanced characters, mostly clearly adaptive to xeric environments. Exostome patterns provide evidences for the segregation of Camptothecium from Homalothecium, Platyhypnidium from both Rhynchostegium and Eurhynchium, Steerecleus from Rhynchostegium, Eurhynchiella from Rhynchostegiella.

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