Pseudotomentella sorjusensis Svantesson & Larsson & Larsson 2021, sp. nov.

• Main Authors: Svantesson, Sten, Larsson, Karl-Henrik, Larsson, Ellen
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Fungi; Basidiomycota; Agaricomycetes; Thelephorales; Thelephoraceae; Pseudotomentella; Pseudotomentella sorjusensis; Jokkmokk; Lule Lappmark
• Online Access: https://doi.org/10.5281/zenodo.6495788; http://treatment.plazi.org/id/03D787D31633F968FF4A14B3D26308F8

Pseudotomentella sorjusensis Svantesson, sp. nov. (Fig. 4) MycoBank No. : MB 835163. UNITE SH : SH1185284.08 FU. Etymology : the name refers to Sorjus, an older spelling of the type locality. Type : SWEDEN. Lule Lappmark: Jokkmokk, Sårjås N, low alpine heath on ground with intermediate pH, on underside of stone, 17 August 2016, S . Svantesson 298 (holotype: GB!, GenBank Acc. No. ITS: MT 146448). Basidiome annual, resupinate, membranaceous; effused to approximately five centimetres in diameter. Mature parts continuous, with a firm, fibrous and compact yet soft and rather elastic texture. Hymenium smooth; greenish brown when fresh, brown with a reddish hue when dried. Immature parts discontinuous, byssoid with a cottony texture. Subhymenium and hymenium of immature parts blue grey when fresh, blue grey to grey brown when dried. Subiculum well-developed, loose, fibrous, brown; forms the outer edge of the basidiome, extending noticeably beyond the hymenium. Hyphal cords lacking, but loose bundles of subicular hyphae sometimes present. Hyphal system monomitic, clamp connections absent from all hyphae. Subicular hyphae noticeably long and straight, thick-walled; forming a loose tissue. Individual hyphae (3.0–) 3.1–4.3 μm wide, with a mean width of 3.6 μm; brown to orange brown in KOH, orange brown in water; inamyloid. Subhymenial hyphae often somewhat sinuous, thin to thick-walled; forming a rather dense tissue. Individual hyphae 3.3–5.2 (–5.5) μm wide, with a mean width of 4.3 μm; hyaline to brown in KOH, with a green or blue green reaction in the presence of air; pale green to pale orange green in water, with strongly granular contents; occasionally amyloid. Encrustation none observed. Basidia with four slightly curved sterigmata, occasionally two-sterigmate; clavate to narrowly clavate, sometimes clavopedunculate, thin-walled, with one–three slight constrictions. Dimensions: 41–56 (–59) × (10.1–) 10.3–12.1 (– 12.6) μm; mean dimensions: 48 × 11.5 μm. Sterigmata (7.0–) 7.2–8.9 (–9.2) μm long, with a mean length of ...