Rhizomnium andrewsianum (Steere) Kop., a high-arctic circumpolar moss, is reported as new to Finland upon a collection made in the Kuusamo District, and as new to Norway upon a recently discovered herbarium specimen from the county of Finnmark. On 3 August 1967 Bowers collected Rhizomnium andrewsianum (Steere) Kop. from a wet roadcut in Oulanka National Park, Finland. The basis for identification was the description by Steere (1958a) and the chromosome number and morphology (Bowers, 1966a,b). A duplicate specimen was also sent to Koponen, who agreed with Bowers' identification. Koponen (1968b) recently revised the Finnish Rhizomnium collections but found no specimens of R. andrewsianum among them. A search through the Cinclidium specimens in the larger Finnish herbaria (Koponen, 1969b) was also without result. Thus Bowers' specimen seems to be the first collection of the species from Finland. Rhizomnium andrewsianum was also represented by an unidentified collection sent to Koponen by the Botanical Museum of Oslo University. The specimen was collected in 1888 by E. Jorgensen in northern Norway, county of Finnmark, Vassbotnfjell in the district of Talvik. No more precise information of the habitat is given on the label. Nyholm (1968) reported Mnium andrewsianum as new to Norway, but the specimen (Stord Island, Tysseskar, 59?50'N, 5?27'E, Holmen 186, in c) was found by Koponen to be Rhizomnium punctatum (Hedw.) Kop. Thus, Jorgensen's specimen from Finnmark seems to be the only known from Norway. Rhizomnium andrewsianum is closely related to R. pseudopunctatum (Bruch & Schimp.) Kop. and, because of its close resemblance, could easily be mistaken for that species. In addition to the fact that R. andrewsianum is dioecious and R. pseudopunctatum synoecious, we can add the following differences (see also Koponen, 1968a,b): Micronemata and micronematous initials are absent on the upper stem parts in R. andrewsianum, but they are present in R. pseudopunctatum; the old stem parts of R. andrewsianum often retain a lustrous reddish color but in R. pseudopunctatum the stems turn brownish, only the young stem parts being reddish. According to Steere (1958a) the capsule of R. andrewsianum is similar to that of R. pseudopunctatum. However, the outer peristome teeth are more similar to those of R. punc1 This study was supported in part by a grant-in-aid of research from the Society of the Sigma Xi, and in part by a grant from the University of Helsinki. 2 Present address: Department of Biology, Northern Michigan University, Marquette, Michigan 49855. 3 Department of Botany, University of Helsinki, Unioninkatu 44, Helsinki 17, Finland. This content downloaded from 157.55.39.243 on Thu, 06 Oct 2016 04:38:39 UTC All use subject to http://about.jstor.org/terms 1969] BOWERS & KOPONEN: RHIZOMNIUM ANDREWSIANUM 253 tatum than to those of R. pseudopunctatum, and the capsules are horizontal. Thus, although the size of the plant and the leaf characters are most similar to R. pseudopunctatum, the above facts seem to ally the species to R. punctatum. Rhizomnium andrewsianum is easily separated even in the sterile condition from any Cinclidium species through the absence of an elongate area of macronematous initials present only in Cinclidium (Koponen, 1968a, 1969a). Since its description by Steere (1958a) Rhizomnium andrewsianum has often been recorded from the arctic and hemiarctic America (Steere, 1958b; Persson, 1962, 1963; Persson & Holmen, 1961; Persson & SjSrs, 1960; Bowers, 1966a, 1966c, 1968). Persson and Holmen (1961) and Kuc (1963) recorded the species from Spitzbergen; Steere (1958a) and Bardunov (1965) reported it from Siberia. Smirnova (1966) mapped the distribution in Russia and reported four localities on the Kola Peninsula not far from the Finnish border. Thus, the present finds from Finland and Norway were to be expected. These finds also suggest that it may be possible to discover some other members of the high-arctic element of bryophytes (Steere, 1953, 1954, 1985) in northern Scandinavia. Specimens examined: GREENLAND. Ameralik Fjord, Vahl, 1830 (H-BR). Disko Fjord, Igdlokasik, 69?34'N, 54?W, Holmen 14047 (H). SPITSBERGEN. Svalbard, collector unknown (c). Kings Bay Distr., Ossian Sarsfjellet, 1 km N of the bird cliff, beside boulders in Cassiope tetragona heath, Arnell &7 Mdrtensson, 1956 (c) (see Arnell & Mtrtensson, 1959, p. 144). NORWAY. FINNMARK: Talvik, Vassbotnfjell, Jorgensen, 1888 (H, O). FINLAND. KUUSAMO: Oulanka National Park, in wet roadcut N of Oulu University Field Station, Bowers bb-1900 (HERB. BOWERS, H). USSR. IRKUTSK DIST.: In valle fl. Tunka, Smirnow, 1926 (H-BR). YAKUT ASSR: In valle fl. Lena, Kumachsur, 70o30' lat. bor., Nilsson-Ehle, 1898 (H).
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