. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 2(a) A distinct and level trimline at perched basin Site 2, 79 cm above water at time of sampling. Physcia caesia was only col- onizing lichen below the trimline. (b) A Staurothelecommunity at a beaver-dam influenced semi-restricted basin (Site 10) with a trimline 40 cm above water, (c) At this isolated, bedrock upland perched basin (Site 12), above the trimline (left half of photo), dominants are Rhizocarpon, Xanthoparmelia, Aspicilia, and Melanelia. At the indistinct trimline (60 cm above water), there is a lichen-
. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 2(a) A distinct and level trimline at perched basin Site 2, 79 cm above water at time of sampling. Physcia caesia was only col- onizing lichen below the trimline. (b) A Staurothelecommunity at a beaver-dam influenced semi-restricted basin (Site 10) with a trimline 40 cm above water, (c) At this isolated, bedrock upland perched basin (Site 12), above the trimline (left half of photo), dominants are Rhizocarpon, Xanthoparmelia, Aspicilia, and Melanelia. At the indistinct trimline (60 cm above water), there is a lichen-free whitish band, followed by a blackish Staurothele band, and below that, extending under water, a mixture of oxide-staining and Staurothele thalli. (d) A level trimline influenced by bird feces at perched basin Site 11, 102 cm above water. Above the trimline (white line) Xanthoria elegcms dominates the cover (its orange thalli do not contrast well against the bedrock in the gray scale image); Physcia caesia is the only other colonizing lichen present. The dark band below the trimline is composed of Staurothele. (e) A high, indistinct, wavy trimline (white line near the backpack) at Site 5 on Lake Athabasca, 224 cm above water. Dominant colonizing lichen below the trimline was Physcia caesia, accompanied by amphib- ious Staurothele (white S) near water level, (f) A wavy and indistinct trimline at Site 7, 220 cm above water, along the Rochers River. Note the patch of flaked rock (pointer from P) in which several young lichens have established, (g) A Leproloma vouauxii trimline on a moist and shady vertical to overhanging gneiss at Site 4, behind a levee, 230 cm above river level, (h) A high, distinct level trimline at the semi-restricted "*"site, 218 cm above water. Note the band of lichen-free white weathered rock below the trimline, below that the blackish Staurothele band, and the lowest band (light gray, but reddish orange in color) of iron oxide stained P
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Keywords: ., bookcentury1900, bookdecade1910, books, booksubjectnaturalhistory
