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Page number:21 
Remarks (public):This robust species has a characteristic greenish to olivaceous color of the pileus, is viscid when fresh, and has numerous tangled pileocystidia (Fig. 28). This combination of characters is distinctive in Panellus. Herbarium specimens without notes could be recognized by the combination of long, broad, pleurocystidia and cheilocystidia; the distinctive pileocystidia; and the thick gelatinous cuticle. 
Description type:Non-original description 
Description:Panellus serotinus (Pers. in Hofmann ex Fr.) Kühner Fl. Analytique Champ. sup. p. 67. 1953. Figs. 5-10, 33.
Agaricus serotinus Fries, Syst. Mycol. 1: 187. 182I.
Pileus 2.5-6.0(-10.0) cm broad, 2.0-3.5 cm wide, convex, fan-shaped, conchate; margin often lobed or wavy, viscid, "vetiver green," "olive ochre" to "deep colonial buff" rarely ochraceous in center to "dark greenish olive," "dark ivy green," "citrine drab" to "dark olive buff" occasionally toned purple over the margin, always sessile. Lamellae close to subdistant, narrow, even, clearly marginate, pale orange to "honey yellow" with "yellowish olive" to "brownish olive" rarely "cinnamon buff " on the margin.
Spores 4.0-5.5 x 1.0-1.5 µm, allantoid to cylindric, with amyloid (blue) walls and yellow contents in Melzer's solution; spore print yellow. Basidia 17-21 x 3.0-4.0 µm, narrowly clavate, 4-spored. Pleurocystidia 35-64 x 6.5-11 µm, fusiform, broadly fusiform, to clavate, thin-walled, sometimes with incrustations over the apex, hyaline in KOH, yellowish in Melzer's solution, frequent, projecting up to 1/2 of total length. Cheilocystidia 40-60 x 6.5-12 µm, nearly cylindric, fusiform to narrowly clavate, thin-walled, hyaline in KOH, yellowish in Melzer's solution, abundant, projecting 1/2 to 3/4 of total length. Cuticle with numerous tangled or decumbent, nearly cylindric, fusiform to long-clavate, thin-walled pileocystidia 50-90 x 6-9 µm with yellow contents in Melzer's solution, hyaline in KOH, olive in H20, and arising from a thin cutis composed of interwoven thin- and thick-walled hyphae 2.5-8.5 µm diam., the hyphae yellow in Melzer's solution, hyaline in KOH. Trama of pileus duplex with an upper gelatinous layer containing interwoven, thin-walled hyphae 1.5-3.5 µm diam. and is often folded or partially gelatinized. Lower trama of non gelatinous, interwoven, thin- and thick-walled hyphae 3.5-18.0 µm diam., bearing clamp connections, dingy yellow-brown in Melzer's solution, light yellowish in KOH. Trama of lamellae of loosely interwoven, mostly thick-walled hyphae 2.5-11.0 µm diam., yellowish in Melzer's solution, light yellowish in KOH.
Habit, habitat, and distribution. - Occasionally solitary but usually imbricate on the sides of logs and sticks of various hardwoods and conifers, usually before they become decorticated. Noted on Alnus, Populus, Ulmus, Fagus, Betula, and Quercus, but also on Tsuga heterophylla in the western United States. Fruiting in the fall especially during late September and October. Widely distributed throughout North America, Europe, and Asia.
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