Öst. Z. Pilzk. 20: 39. 2011.
Common Name: none
Synonyms: Boletus zelleri Murrill; Ceriomyces zelleri Murrill; Xerocomus zelleri (Murrill) Snell
Cap 4-11 cm broad, convex, nearly plane at maturity; brown to blackish-brown, velvety, smooth to uneven, with a whitish bloom when young, occasionally aereolate in age; flesh pallid to yellowish, sometimes bruising blue.
Pores small, pallid, becoming yellowish-green, often (but not always) bruising blue.
Stipe 5-10 cm long, 1-3 cm thick, more or less equal, dry, reddish over a yellow ground color, usually yellow at the base.
Spores 11-15 x 4-6 µm, smooth, fusiform (spindle-shaped). Spore print olive-brown.
Solitary or in small groups from early fall to mid-winter under conifers, particularly Douglas fir and coast redwood.
Edible and good, but often infected with fly larvae.
This handsome bolete is most easily recognized by examining young material which has a blackish-brown velvety cap, yellowish pores that usually bruise blue, and a reddish stipe. Xerocomellus chrysenteron is similar but the cap is not as dark and tends to crack at maturity.
Bessette, A.E., Roody, W.C. & Bessette, A.R. (2000). North American Boletes: A Color Guide to the Fleshy Pored Mushrooms. Syracuse University Press: Syracuse, NY. 400 p.
Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
Klofac, W. (2011). Rotfußröhrlinge (Gattung Xerocomellus) in aktueller Sicht. Österreichische Zeitschrift für Pilzkunde 20: 35-43.
Ladurner, H. & Simonini, G. (2003). Xerocomus s.l. Edizioni Candusso: Alassio. 527 p.
Murrill, W.A. (1912). Polyporaceae and Boletaceae of the Pacific Coast. Mycologia 4(2): 91-100. (Protologue)
Smith, A.H. (1949). Mushrooms in their Natural Habitats. Sawyer's Inc: Portland, OR. 626—p.
Snell, W.H., Singer, R. & Dick, E.A. (1959). Notes on Boletes. XI. Mycologia 51(4): 564-577.
Thiers, H.D. (1975). California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p. (WWW)