Key to 6 Floccularias in North America 
1. | Yellow shades present on the gills or cap, at least by maturity. | 2 |
1. | Yellow shades absent from gills and cap in all stages of development. | 4 |
2. | Young cap bright yellow and prominently scaly. | |
2. | Young cap dull yellow or brownish; bald or with appressed fibrils but not prominently scaly. | 3 |
3. | Edge of the cap not bright yellow at maturity; hyphae in pileipellis often constricted at septa (illustration). | |
4. | Cap grayish to grayish brown, at least over the center. | |
5. | Young cap prominently scaly. | Floccularia straminea var. americana f. alba |
5. | Young cap smooth or with appressed fibers. | Floccularia albolanaripes f. alba |
References
Cripps, C. L., V. S. Evenson & M. Kuo (2016). The essential guide to Rocky Mountain mushrooms by habitat. Urbana: University of Illinois Press. 260 pp.
Lange, C. (2018). Floccularia Pouzar. In Knudsen, H. & J. Vesterholt, eds. Funga Nordica: Agaricoid, boletoid, clavarioid, cyphelloid and gastroid genera. Copenhagen: Nordsvamp. 626–627.
Mitchel, D. H. & Smith, A. H. (1976). Notes on Colorado fungi II. Species of Armillaria (Fr.) Kummer. (Agaricales) Mycotaxon 4: 513–533.
Mitchel, D. H. & Smith, A. H. (1978). Notes on Colorado fungi III: New and interesting mushrooms from the aspen zone. Mycologia 70: 1040–1063.
Thiers, H. D. & Sundberg, W. J. (1976). Armillaria (Tricholomataceae, Agaricales) in the western United States including a new species from California. Madroño 23: 448–453.
Volk, T. J. & Burdsall, H. H. (1995). A nomenclatural study of Armillaria and Armillariella species (Basidiomycotina, Tricholomataceae). Synopsis Fungorum 8.
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Kuo, M. (2020, February). The genus Floccularia. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/floccularia.html
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