What You Should Know
Strobilurus trullisatus is a small mushroom, nondescript in appearance but notable for being highly restricted in habitat: most species grow only on conifer cones. It is recognized by a pale-colored cap with pinkish tones and a yellowish-brown stem base. The fruitbodies often arise from buried cones, so a little excavation may be required to make the substrate apparent.
Strobilurus kemptonae is an older name for this mushroom.
Other names: Douglas-Fir Cone Mushroom.
Strobilurus trullisatus Mushroom Identification
0.4-1.7 cm broad, convex, expanding to nearly plane and slightly depressed; surface smooth to faintly wrinkled, pallid brown at the disc shading to a pale pinkish, striate margin; flesh thin and white.
Adnate to adnexed, close, white to pinkish-tan.
1.5-4.5 cm tall, 0.1-0.2 cm broad, white, subtomentose above, yellowish-brown and pubescent below, orange-brown mycelium at the base; veil absent.
Thin; whitish; unchanging when sliced..
3.5-6 x 2-3 µm, elliptical, smooth, nonamyloid.
Solitary to grouped on decaying Douglas fir cones; from late summer in areas of fog drip to mid-winter. Originally described from Alaska; distributed in the Pacific Northwest and northern California and sometimes reported from the Rocky Mountains.
Unknown. Too small to be of any culinary value.
Basidia 18–22 x 3–5 µm; clavate; 4-sterigmate. Cheilocystidia 30–60 x 5–6 µm; utriform to subcylindric, with a capitate apex; smooth; thin-walled; hyaline in KOH. Pleurocystidia 30–50 x 8–12 (–18) µm; utriform to subcylindric, with a subcapitate to capitate apex; smooth; thin-walled; hyaline in KOH. Pileipellis hymeniform; terminal cells 7.5–12.5 µm wide, obpyriform, hyaline in KOH—with interspersed pileocystidia 35–70 x 5–10 µm, subcylindric to narrowly fusiform, developing a capitate apex, smooth, hyaline in KOH. Clamp connections not found.
Strobilurus trullisatus Look-Alikes
Favors Sitka spruce cones, tends to be browner without a pinkish cast, and has thicker-walled pleurocystidia that lack granular material at the tip (and lack an apical collarette).
May grow on debris, tends to be browner (often grayish brown) and its pleurocystidia lack apical collarettes.
Differentiated by its slightly larger size, crowded gills, weakly amyloid spores, pleurocystidia that lack apical collarettes, hyphae with clamp connections, and cap cuticle composed of repent, radially oriented filamentous hyphae.
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