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Laccaria amethysteo-occidentalis- the "western" Amethyst Deceiver -can be found commonly in the coniferous forests of northwestern United States and western Canada. In contrast, its eastern relative, L. amethystina, appears to be restricted to the temperate deciduous or mixed coniferous-deciduous forests in eastern North America and Europe as well as tropical Quercus forests of Central America and Colombia.
Laccaria amethysteo-occidentalis is a mushroom found under conifers, usually pine, growing alone, scattered or gregariously in western North America.[2]
The cap is 1–7 cm; broadly convex to plane, becoming nearly flat with age; often with a central depression. The surface is nearly bald, or fibrillose to scaly. Cap is hygrophanous, dark purple, purple, fading to brownish purple or buff.[3]
The gills are attached to the stem, sub-distant to distant, purple fading to dull lilac or grayish purple. The stem is 1.5–12 cm long and 0.5–1.5 cm thick, equal or slightly swollen at the base and strongly grooved, with striated, coarse hairy or scaly purplish to pale purple color. The flesh is thin purple to whitish.[4] The mushroom is edible.[1]
Spores are 7.5–10.5 x 7–16 µm, subglobose or broadly elliptical. The spore print is white.
This species is similar to L. amethystina but differs by occurring than hard wood forest and in Eastern North America, rather than conifers forest; having a smaller sporocarp; and being a lighter purple color. L. bicolor is smaller and less purplish; L. laccata has whitish mycelium at its base.[5] Cortinarius violaceus is darker and has a less fibrillose stipe.[5]
Laccaria amethysteo-occidentalis is a mushroom found under conifers, usually pine, growing alone, scattered or gregariously in western North America.
