Key to about 20 North American Stropharioid Mushrooms
|1.||Fresh cap scarlet to orange.|
|1.||Fresh cap otherwise colored (brown, tan, yellow, wine red, purplish, white, green, blue).|
|2.||Found in woodchips, landscaping areas, waste places (and so on) in coastal California (perhaps elsewhere?); stem smooth to finely hairy.|
|3.||Cap with blue or green colors (if stem bruises blue, see Psilocybe).|
|3.||Blue or green colors absent.|
|4.||Gill edges colored like the faces during all stages of development; chryso-cheilocystidia abundant.|
|4.||Gill edges often whitish at maturity, contrasting with the faces; chryso-cheilocystidia absent or very rare.|
|5.||Cap dark green to dark blue when young, often fading to yellowish; ring fairly well developed, at least when young.|
|5.||Cap bluish or greenish when young, but becoming whitish with faint bluish tints; ring poorly developed, even when young.|
= S. albocyanea
|6.||Mature cap medium sized to large; regularly greater than 5 cm in diameter.|
|6.||Mature cap small; rarely greater than 5 cm in diameter.|
|7.||Cap without scales, typically wine red when young, becoming brownish--but occasionally brownish when young, or in one form white in all stages of development; ring prominent and well developed, with distinctive bent-back scales or "claws" on its underside; growing in woodchips, landscaping areas, mulch, and so on; spores 11-14 x 7-9 µ.|
|7.||Not completely as above.|
|8.||Found in western North America (especially northern California and the Pacific Northwest); tall (mature stem 8-15 cm long); cap slimy and yellow, fringed with drooping white veil remnants on the margin.|
|8.||Not completely as above.|
|9.||Stem conspicuously scaly, especially when young.|
|9.||Stem smooth, fibrillose, or slightly shaggy when young, but lacking conspicuous scales.|
|10.||Cap yellow and dry, innately scaly ("scales" not merely veil remnants; not easily rubbed off); spores not longer than 8 µ.|
|10.||Not completely as above.|
|11.||Young cap purple brown to reddish brown; stem 1-2 cm thick; chrysocystidia present on gill faces.|
|11.||Young cap yellow to orangish brown; stem .5-1 cm thick; chrysocystidia absent.|
|12.||Found in hardwood forests in eastern North America; cap dull brownish yellow; ring thin but persistent and membranous; spores 6-7 µ long.|
|12.||Found in western North America under aspens, cottonwoods, and alders (especially in riparian ecosystems); cap yellowish to whitish; ring fragile, soon disappearing or remaining only as a zone of fibrils; spores 13-16 µ long.|
|13.||Young cap wine red; reported from piles of hardwood debris in flooded lowlands in Illinois and Indiana.|
|13.||Cap otherwise colored; distribution and ecology various.|
|14.||Stem shaggy-scaly; cap slimy, dull yellow to orangish; found in woods; spores 12-14 µ long; chrysocystidia absent.|
|14.||Not completely as above.|
|15.||Growing in grass, on dung, in woodchips, in gardens, and so on.|
|16.||Found in western North America under aspens, cottonwoods, and alders (especially in riparian ecosystems); mature cap 3-5 cm across; spores 11-15 µ long; chrysocystidia apparently absent.|
|16.||Not completely as above.|
|17.||Cap whitish (sometimes with a yellowish center); fresh stem dry; reported from Michigan and California.|
|17.||Cap honey yellow; fresh stem with a slimy sheath; reported near Seattle "among leaves in woods" and from Oregon "on humus under spruce."|
|18.||Ring fairly persistent, usually remaining throughout development.|
|18.||Ring ephemeral, usually disappearing with maturity or persisting merely as a zone of fibrils.|
|19.||Fresh, young cap yellow to yellowish; spores 7-11 µ long or 13-16 µ long.|
|20.||Growing in grassy areas across North America; spores 7-11 x 4.5-5.5 µ.|
|20.||Growing in wood chips and in waste places on the West Coast; spores 13-16 x 7-9 µ.|
|21.||Fresh stem with a slimy sheath; cap convex to nearly round, but not bell-shaped; spores 15-19 µ long.|
|21.||Not completely as above.|
|22.||Growing in wood chips in western North America; cap 3-5 cm across, yellow becoming whitish; spores 11-15 µ long.|
|22.||Not completely as above.|
|23.||Cap 1-2.5 cm across, bell-shaped, yellowish brown with a darker center; spores 17-19 µ long.|
|23.||Cap slightly larger than above, convex to planoconvex, paler than above; spores shorter.|
|24.||Stem about 2 mm thick; widely distributed in North America.|
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Kuo, M. (2018, November). Stropharioid mushrooms. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/stropharioid.html