Hypomyces microspermus
Mycologia 81(3): 426. 1989.
Common Name: none
For descriptions see Rogerson & Samuels and Siegel & Schwarz
Ascospores fusiform-ellipsoid, (8–) 10–15 x (2.3–)3–4 µm.
Widespread and common, fruiting on boletoid species, especially Xerocomellus and Xerocomus.
Unknown.
Initially a white mold on boletes, then becoming bright yellow. Easily confused with Hypomyces chrysospermus, which has much larger spores.
Beug, M.W., Bessette, A.E. & Bessette, A.R. (2014). Ascomycete Fungi of North America. University of Texas Press: Austin, TX. 488 p.
Rogerson, C.T. & Samuels, G.J. (1989). Boleticolous Species of Hypomyces. Mycologia 81(3): 413-432. (PDF) (Protologue)
Siegel, N. & Schwarz, C. (2016). Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.
Siegel, N. & Schwarz, C. (2024). Mushrooms of Cascadia: A Comprehensive Guide to the Fungi of the Pacific Northwest. Backcountry Press: Keeland, CA. 576 p.
Valdez, G.U. & Douhan, G.W. (2012). Geographic structure of a bolete-infecting cryptic species within the Hypomyces microspermus species complex in California. Mycologia 104(1): 14-21.
