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Summary: 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).
Cap: 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)
Flesh: thick, firm, with a gelatinous layer under the cuticle; white, (Arora), thick near stem, thinning out toward margin, soft, spongy; watery whitish, (Breitenbach)
Gills: 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)
Stem: 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)
Veil: absent (Arora)
Odor: not distinctive (Bessette), faint, pleasantly mushroomy (Breitenbach)
Taste: 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)
Pleurotus ostreatus is somewhat similar but Panellus serotinus has gills that soon become yellow, and a distinctly punctate-scaly, yellow stem (Breitenbach). Panus conchatus has a +/- lilac-brownish, but never greenish cap, lateral stem, and appears earlier in the year, (Breitenbach).
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
18/11/2019 5:48:42 AM
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