What You Should Know
Russula albonigra is a species of fungi in the family Russulaceae. The cap is convex to infundibuliform, whitish, sticky. The stipe is dusky, or white above, pale gray-ochreous towards the base. The gills are decurrent, crowded, thick, unequal, connected by veins, dusky whitish or yellowish. The flesh is white, turns black or sooty. The taste is somewhat bitter and unpleasant to mild. Habitat solitary to gregarious in duff under conifers; fruiting from fall through winter in mixed conifer or hardwood-conifer forests along the north coast and the Sierra foothills.
First described by the mycologist Julius Vincenz von Krombholz in 1838, its specific epithet comes from Latin albus and niger, which mean white and black.
Edible but low food quality. Used after 15 minutes of boiling, boiled, fried, and salting.
Russula albonigra Mushroom Identification
5 - 10 cm in diameter, first convex, with a twisted edge, later spread, concave-spread, with a thick smooth edge. The surface of the cap is smooth, dry, matte, sticky in wet weather, white, brownish, dirty-white-brown, lighter whitish at the edges, black when dry. In young specimens in places of contact turns black.
The plates are narrow, thick, of various lengths, initially white, whitish, creamy, blacken in maturity, blacken in places of damage.
3 - 7 cm high, 1.5 - 2.5 cm in diameter, cylindrical, smooth, dense, initially white, black with age, black in places of contact.
The flesh is dense, firm, brittle, white, black on the cut, odorless, and with a slightly pungent taste. Reaction with FeSO4 (iron sulphate) turns the flesh green.
7.7-9 * 5.7-6.7 microns, elliptical, elongated, finely warty.
Russula albonigra Look-Alikes
Also forms robust white fruitbodies that soon turn black and lack a red staining phase; however, R. atrata has a thicker gelatinous pileipellis, which can be distinguished only through microscopic analyses.
Has a viscid cap: it may redden slightly before turning smoky brown or grayish black.
Redden before blackening.
Russula albonigra Synonyms
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