. The Canadian field-naturalist. 294 The Canadian Field-Naturalist Vol. 93. Figure 6. Typically dense clump of Pellaea occidentalis growing in hair-line fissure in open, south-facing limestone rock face. South (5 km) of Canmore Alberta, 1 November 1977. Table 1—Comparison of characteristics of Pellaea atropurpurea, P. occidentalis, and P. suksdorfiana. Source: \, Rigby and Britton (1970): 2, Tryon (1957); 3, This study Characteristics P. occidentalis P. suksdorfiana P. atropurpurea Source Chromosome no. 2n = 58 2«= 116 In = 87 1 No. of spores per 64 (small) 32 (large) 32 (large) L2 sporangium
. The Canadian field-naturalist. 294 The Canadian Field-Naturalist Vol. 93. Figure 6. Typically dense clump of Pellaea occidentalis growing in hair-line fissure in open, south-facing limestone rock face. South (5 km) of Canmore Alberta, 1 November 1977. Table 1—Comparison of characteristics of Pellaea atropurpurea, P. occidentalis, and P. suksdorfiana. Source: \, Rigby and Britton (1970): 2, Tryon (1957); 3, This study Characteristics P. occidentalis P. suksdorfiana P. atropurpurea Source Chromosome no. 2n = 58 2«= 116 In = 87 1 No. of spores per 64 (small) 32 (large) 32 (large) L2 sporangium Frond length Maximum 15 cm Maximum 20 cm Maximum 35 cm 1,3 Frond displacement* Dense, thickly Open and spreading. Erect and spreading. clumped "pin extending out beyond extending up and outward cushions" flush with rock face from ledges far beyond rock face rock face Rachis color* Golden to dark brown Reddish-brown to brown-purple Purple to blackish-purple 1,3 Stipes* Thin and brittle Thicker and sturdy. Thick and sturdy. 3 old stipes rarely sparsely heavily pubescent inconspicuous pubescent, old stipes conspicuous and often silvery color old stipes abundant, silvery color Pinnae* Mitten-shaped and Oblong-lanceolate and Lanceolate to oblong- 1, sessile; margins (at least lower) lanceolate and strongly reflexed petioled: margins strongly reflexed petioled; margins slightly reflexed Pinnae angle Perpendicular Acute Broad 2,3 to rachis Site preference* Dry exposed Shaded cool, E-or Dry partially-shaded. 3 SW-facing limestone N-facing calcareous cliffs by water SW-facing limestone ?Feature of particular value for field Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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