. The Canadian field-naturalist. 4" Kobresia myosuroides • K. simpliciuscula .<3. Figure 5. Ontario distribution of Kobresia myosuroides and K. simpliciuscula. Kobresia simpliciuscula Kenora District: 55°07'N; Cap Henrietta Maria. Dutilly. Lepage 31135. 10 August 1953 (Dutilly et al. 1954). 54°34'N, 84°38'W; Hawley Lake, Sjors. 1961 (Lepage 1966). 54°48'N, 82°23'W; Runway 415, south of Cape Henrietta Maria, Rilev 5850, 23 August 1976 (TRT). 56°22'N, 88°08'W. Rilev 8465. 16 July 1978 (TRT). 55°29'10"N, 85°4ri5"W; SW coast of Hudson Bay, approx. 16 km NW of Winisk, km from
. The Canadian field-naturalist. 4" Kobresia myosuroides • K. simpliciuscula .<3. Figure 5. Ontario distribution of Kobresia myosuroides and K. simpliciuscula. Kobresia simpliciuscula Kenora District: 55°07'N; Cap Henrietta Maria. Dutilly. Lepage 31135. 10 August 1953 (Dutilly et al. 1954). 54°34'N, 84°38'W; Hawley Lake, Sjors. 1961 (Lepage 1966). 54°48'N, 82°23'W; Runway 415, south of Cape Henrietta Maria, Rilev 5850, 23 August 1976 (TRT). 56°22'N, 88°08'W. Rilev 8465. 16 July 1978 (TRT). 55°29'10"N, 85°4ri5"W; SW coast of Hudson Bay, approx. 16 km NW of Winisk, km from coast. Sims 2043. 20 July 1978 (SSMF, TRT). 55°22'35"N, 85°22'50"W; SW coast of Hud- son Bay, approx. 7 km NW of Winisk, 2 km from coast. Sims 2182, 2185, 26 July 1978 (SSMF, (TRT). 55°02'N, 82°4rW. Rilev 9169. 27 Julv 1978 (TRT)^ 54°47'N, 82°39'W. Rilev 9358, 28 July 1978 (TRT). 54°50'N, 82°46'W. Rilev 9372. 28 July 1978 (TRT). 55° 12'N, 84° 17'W. Rilev 9401. 29 Julv 1978 (TRT). 54° 19'N, 84°30'W. Rilev 9476, 29 July 1978 (TRT). 54°38'N, 84°37'W; slope of Sutton River about 1 km from the river. Rilev 9567, 29 July 1978 (TRT). 54°38'N,85°20'W. Rilev 9631. 30 June 1978 (TRT). 53°38'N, 83°29'W. Rilev 9737. 3 August 1978 (TRT). The distribution in Ontario (Figure 5) of this circumpolar arctic-alpine sedge is much more wide- spread than indicated by the few early records. The dozen subsequent records are all from calcareous habitats; six were made from open graminoid or open low shrub fens with pH's between and , peat depths from 7 to 50 cm. These fen sites all had a vascular plant ground cover dominated by Scirpus cespitosa, with Carex rariflora, C. livida, C. limosa, Betula glandulifera, Juniperus horizomalis, and Mvrica gale as common associates. The most com- mon bryophytes recorded were Scorpidium scor- poides, Tomenlhvpnum nitens. and Drepanocladus spp. The non-wetland sites in which Kobresia sim- pliciuscula occurs include a var
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