Clitolyophyllum akcaabatense Sesli, Vizzini & Contu, in Sesli et al., Canadian Journal of Botany 94(2): 75 (2016)
Etymology: “akcaabatense” comes from “Akcaabat”, one of the districts of Trabzon.
Diagnosis: It is distinguished by fruiting on the bark of Picea orientalis; fan shaped and umbilicate, thin and striated pileus, whitish and decurrent lamellae; 2–4 spored basidia; smooth and ellipsoid spores (5.5–) 6.0– 8.0(–9) m × (3.3–)3.5–5(–6.0) m; and unique ITS/LSU/ rpb2 sequences.
Basidiomata clitocyboid. Hyphal system monomitic. Pileus 30–55(–60) mm broad, fan shaped, with a slightly costate to undulating, folded and irregular margin with a small depression resembling a navel and a V-shaped slit where it is connected to the stipe; surface smooth, dull, slightly hygrophanous, translucent-striate toward to margin, gray-beige to beige-brownish, horn-gray, or wood colour when moist (Pale Ochraceous-Buff, Ochraceous- Buff, Yellow Ocher, Cinnamon-Buff, Chamois, Avellaneous), slightly darker toward the centre (Orange-Cinnamon,; Isabella ColorWood Browm,), palecream colored (Light Buff) when dry. Lamellae decurrent, broad towards pileus’ centre, shallow towards margin, thin, L = 35–45, I = 1–4, interveined at base, at first whitish then light cream or beige (Pale Ochraceous- Salmon, Pale Ochraceous-Buff). Stipe 20– 30 mm × 4–7 mm, laterally attached to the pileus, cylindrical to flattened, hollow with enlarged apex and tapering towards the base, sometimes twisted, tough, elastic, at apex smooth and concolorous with pileus surface, 2/3 of the surface towards the base covered with a typical white to creamy, woolly mycelium. Context thin, white to gray-beige. Odour fungoid. Taste indistinct. Spore-print white.
Basidiospores (5.5–)6.0–8.0(–9) μm × (3.3–)3.5–5(–6.0) μm, on average 7.2 μm × 4.2 μm (n = 100), E = 1.50–1.85, Q = 1.58–1.78, ellipsoid, ellipsoid–fusoid, sublacrymoid, thin-walled, hyaline, smooth, nondextrinoid, cyanophilic. Basidia 25–30(–37) μm × 6.5–7.5 μm, 2–4 spored, clavate or subcylindrical, without siderophilous granulation, with basal clamp connection. Basidioles 15–20 μm × 3.5– 5.0 μm, narrowly clavate, subfusoid, subcylindrical. Hymenial cystidia not observed. Hymenophoral trama regular, consisting of cylindrical, subinflated, thin- to slightly thick-walled, nondextrinoid parallel hyphae 3.5– 60(–90) μm × (7.5–)15–25 μm. Pileipellis made up of irregularly cylindrical, clavate, thin- to slightly thickwalled, smooth, subinflated hyphae 40–50(–100) μm × (5.5–)20–30 μm; some hyphae slightly gelatinized with intracellular pigment; terminal elements adpressed to suberect, sometimes pileocystidia-like. Stipitipellis a cutis of cylindrical, parallel, slightly thick-walled, smooth, nondextrinoid, hyphae 5.5–15 μm wide. Caulocystidia 35–45 μm × 4.5–15 μm, irregular, cylindrical, subfusoid or almost subulate, sometimes branched, thin- to slightly thick-walled. Clamp-connections present in all tissues.
Habit, Habitat, And Distribution: solitary to gregarious, growing on the dead bark of Picea orientalis together with mosses. Fruiting in autumn, so far known only from Turkey.
Index Fungorum number: IF814483
Figure. 1. Phylogeny of selected members of the Tricholomatoid clade based on a Bayesian and Maximum Likelihood Inference analysis of a supermatrix of three nuclear gene regions (nrITS, nrLSU, and rpb2). Bayesian posterior probability (BPP) values (in bold) ≥0.75 and Maximum Likelihood bootstrap (MLB) values ≥50% are shown on the branches. The newly sequenced collection is in bold.