E-Flora BC: Electronic Atlas of the Flora of British Columbia

Panellus serotinus (Schrad.) Kuehner
late oyster mushroom

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi

© Alex Bodden  Email the photographer   (Photo ID #72969)

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Distribution of Panellus serotinus
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Species Information

Panellus serotinus is recognized by its viscid, greenish to yellowish or violet-tinted, kidney-shaped or fan-shaped cap up to 10cm or 15cm in diameter, pale yellow to ocher or pale orange gills, short, stubby, lateral stem, and growth on wood. Mycobank uses the name here (accessed Jan. 28, 2014), with Sarcomyxa serotina as a synonym, but the online Index Fungorum, accessed Jan. 28, 2014, gives the current name as Sarcomyxa serotina. It is fairly common in the Pacific Northwest in fall and winter, (Arora). Panellus serotinus is found specifically in BC (in Redhead(5)). It was reported from OR by Kauffman(5) and by Zeller(2). The University of British Columbia has collections from BC and the University of Washington has collections from WA, OR, ID, CA, AK, and NY. It occurs throughout much of North America (Phillips) and also occurs in Europe (Breitenbach).
2.5-10(15)cm, kidney-shaped or fan-shaped, "margin incurved, often lobed or wavy"; olive-green to yellow-green, ocher, greenish brown, or with violet tones; viscid when moist or when old, (Arora), 3-10cm, conchate, flabellate [fan-shaped], to broadly lingulate [tongue-shaped], convex becoming indented and undulating, margin inrolled when young; light green, yellow-olive, to brown-olive or reddish olive; "smooth, strongly slimy-lubricous when moist", finely velvety when dry, appressed fibrillose-scaly, increasingly squamose [scaly] toward the stem, margin becoming somewhat striate, (Breitenbach), "olive-green or yellowish, often with a flush of violet", (Phillips), "dull green, yellowish green, bluish gray or dull brown", (Ammirati)
thick, firm, with a gelatinous layer under the cuticle; white, (Arora), thick near stem, thinning out toward margin, soft, spongy; watery whitish, (Breitenbach)
adnate to decurrent, close; "pale orange to ochraceous to pale yellow", often fading when old, (Arora), subdecurrent and +/- set off from stem, 50-110 reaching stem, broad at cap margin, increasingly narrow toward the stem, forking, 5-16 subgills between neighboring pairs of gills; cream then cream to ocher; "edges smooth and somewhat floccose", (Breitenbach), crowded, narrow; ocher-yellow to slightly violet on edges, (Phillips)
absent or if present, laterally attached, short and stubby, 0.5-2.5cm long; yellow to brownish or cap-colored; hairy or velvety, (Arora), 0.8-1.5(2)cm x 0.8-2cm, short, conic, solid; "punctate from dark scales on an ocherish to saffron-yellow background, sometimes almost strigose toward the base", (Breitenbach)
absent (Arora)
not distinctive (Bessette), faint, pleasantly mushroomy (Breitenbach)
not distinctive or bitter (Bessette), "mild, somewhat bitter after being chewed for a rather long time", (Breitenbach)
Microscopic spores:
spores 4-6 x 1-2 microns, sausage-shaped [cylindric to slightly curved], smooth, typically amyloid at least in dried specimens, (Arora), spores 3.7-6.5 x 1-1.5 microns, cylindric, allantoid, smooth, with droplets; basidia 4-spored, 13-20 x 2.5-3 microns, cylindric, with basal clamp connection; pleurocystidia sparse, like cheilocystidia, cheilocystidia numerous, 30-60 x 9-15 microns, clavate to fusiform, "sometimes with yellowish contents or covered in places with an amorphous, refractive substance", (Breitenbach)
Spore deposit:
yellowish (Arora), white (Breitenbach)

Habitat / Range

scattered or in shelving groups "on dead hardwood logs and branches (especially wild cherry), sometimes also on conifers", fall and winter, usually appearing late in season, (Arora), single to clustered or imbricate on dead or living wood or hardwoods, (Breitenbach), often found on alders in December and January (Sept)

Synonyms and Alternate Names

Acanthocystis serotinus (Schrad.) Konrad & Maubl.
Pleurotus serotinus (Schrad.) P. Kumm.
Sarcomyxa serotina (Schrad.) P. Karst.

Taxonomic and Nomenclatural Links

Genetic information (NCBI Taxonomy Database)
Taxonomic Information from the World Flora Online
Index Fungorium
Taxonomic reference: Compte rendu hebdomadaire des Sciences de l'Academie des sciences, Paris 230: 1889. 1950

Additional Range and Status Information Links


yes, mediocre and sometimes bitter as it ages, (Arora), no (Phillips), edible but rather tough, must be cooked a long time over low heat, (Bessette), stomach upset recorded (Brown)

Additional Photo Sources

Related Databases

Species References

Breitenbach(3)* (as Sarcomyxa), Arora(1), Phillips(1)*, Miller(14)*, Lincoff(2)*, Ammirati(1)*, Schalkwijk-Barendsen(1)*, Courtecuisse(1)*, Bessette(2)*, Barron(1)*, Sept(1)*, Hansen, L.(2), Brown(1), Kauffman(5) (as Pleurotus), Zeller(2) (as Pleurotus),

References for the fungi

General References