Photo: © Steve Trudell
Tricholoma sejunctum
(Fr.) Quel.

Pileus: 4 - 11 cm broad; conic to ovoid to broadly and shallowly umbonate at first, then convex to campanulate; margins inrolled at first, becoming decurved and then finally straight and entire when young, but cracking to lacerate when mature; surface moist to viscid at times dry, hygrophanous, with prominent appressed grey to black fibrils; disc dark grey, changing to pale yellow when drying, towards margins pale to light yellow with some green; context 5 mm at junction with stipe, fragile, soft, hygrophanous, grey below disc becoming ochraceous yellow throughout; taste mild to farinaceous; odour farinaceous.

Lamellae: Notched, spaced close to crowded, 1 cm broad, edges serrate to cracking, seperating from context towards margins; pallid, ivory to ochraceous when young then pale yellow when mature, white towards stipe becoming yellow towards margin; 1 lamellulae.

Stipe: 6 - 9 cm long X 0.7 - 1.5 cm wide; surface dry, at times moist, silky fibrous appearing striate, when young fusoid ventricose but becoming equal at maturity, flexous, fragile, at times breaking; colour light yellow at apex becoming white at base; context solid at first then hollow, white to orange white.

Microcharacteristics: Spore print white; spores 5 - 7 X 4 - 6 µm, subglobose to broadly ellipsoid, inamyloid; no clamp connections; hymenial cystidia not abundant, when present filiform to club shaped.

Comments: This species is common in these forests and is distinguished by having a viscid yellowish pileus with dark fibrils. The pale yellow to buff lamellae of this species will distinguish it from similar species that have more rich and even yellow lamellae or species with pure white lamellae.

Further Reading:

Shanks, K.M. 1997. The Agaricales (gilled fungi) of California. 11. Tricholomataceae II. Tricholoma. Mad River Press. Eureka, Ca. pp 54.