Discovered at Blanket Creek Provincial Park south of Revelstoke (British Columbia, Canada), Odontoschisma macounii (Aust.) Underw. and Scapania spitzbergensis (Lindb.) K. Miill. are reported from their southwesternmost localities in North America, about 1,000 km southward from the recently reported occurrences in British Columbia. In May 1986, at the suggestion of D. H. Vitt, University of Alberta, we visited Sutherland Falls (50050'N, 118005'W; + 500 m in elevation) at Blanket Creek Provincial Park, 23 km south of Revelstoke, on a northern arm of Upper Arrow Lake (British Columbia, Canada). The forest, which covers the area-except at the waterfalls-is of secondary nature, a product of the exploitation of the rich ore-bearing deposits at the turn of the century. However, in spite of this, it hosts a number of plants disjunct from the coastal rain forest. The forest is composed mainly of Thuja plicata, Betula papyrifera, Tsuga mertensiana, T. heterophylla and Pseudotsuga menziesii. Among the bryophytes occurring at this locality, Orthotrichum lyellii and Herbertus aduncus show a similar disjunct distribution pattern (Horton & Vitt 1980). Within the forest, especially in the neighborhood of the falls on the right side of the stream, several cliffs of base-rich siliceous rocks are covered by a very rich and diverse bryophytic vegetation. Among our collections, two species are of particular interest: Odontoschisma macounii and Scapania spitzbergensis. Authority names and nomenclature follow Ireland et al. (1980) for the mosses and Stotler and Crandall-Stotler (1977) for the hepatics. The specimens cited (B. & S. no ... .) are on deposit in BERN, LGHF, UBC and ALTA. 1. Odontoschisma macounii (Aust.) Underw. 0. macounii was collected on a wet vertical cliff bordering the river, about 20 m downstream from the waterfall (leg. Bisang & Schumacker 86326). It was found on sandy material at 30-50 cm above the water level, together with Jungermannia obovata (B. & S. 86588, teste J. Vaiia, Prague), Lophozia heterocolpos (B. & S. 86326b), Blepharostoma trichophyllum (B. & S. 86326c) and Hygrobiella laxifolia (B. & S. 86580). On the lowest zones of the cliff-which are periodically inundated--Scouleria aquatica (B. & S. 86329) was observed, while the highest parts were covered by large mats of Herbertus aduncus (B. & S. 86325). Close to the stands of 0. macounii were the following species: Anastrophyllum minutum (B. & S. 86324), Diplophyllum taxifolium (B. & S. 86320), Plagiopus oederiana (B. & S. 86320b) and Amphidium lapponicum (B. & S. 86587). Since 0. macounii generally occupies mostly open places in tundra or parkland-like forest, the ecology is here somewhat unusual, but not exceptional (Schuster 1974; Godfrey & Schofield 1979). 0. macounii is essentially an artic-alpine, imperfectly circumpolar species. Since its distribution was mapped by Schuster (1958, p. 262, map 68), it has been reported from numerous additional localities in North America. In western America (Fig. 1) it is known from Alaska (some 30 loc.); Schuster 1958, p. 262; Steere & Inoue 1978, p. 322; Godfrey & Schofield 1979, p. 165), Yukon (8 loc.; Hong & Vitt 1977, p. 467); D. H. Vitt, personal communication), Northwest Territories (5 loc.; Steere, Scotter & Holmen 1977, p. 1752; D. H. Vitt, personal communication), British Columbia (2 loc.; Godfrey & Schofield 1979, p. 165) and recently from Saskatchewan (1 loc.; D. H. Vitt, unpublished, personal communication). Our report is the third one for British Columbia and the southwesternmost for North America at 0007-2745/87/237-240$0.55/0 This content downloaded from 207.46.13.111 on Tue, 09 Aug 2016 06:10:19 UTC All use subject to http://about.jstor.org/terms 238 THE BRYOLOGIST [VOL. 90 170 180 170 160 140 100
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Jan 1, 1994
J Delasheras + 2
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