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464 Persoonia – Volume 42, 2019 Suillus gastroflavus Fungal Planet description sheets 465 Fungal Planet 948 – 19 July 2019 Suillus gastroflavus Zvyagina, Rebriev, Sazanova & E.F. Malysheva, sp. nov. Etymology. ‘gastro’ refers to the artificial genus Gastrosuillus; ‘flavus’ Typus. RUSSIA, Magadan Region, Srednekansky district, vicinity of Seim- refers to similarity with Suillus flavus. chan village, meadow of Seimchanka river, N62.96157° E152.3382°, on soil in flooded mixed forests with Larix cajanderi and Salix schwerinii, S. bebiana, Classification — Suillaceae, Boletales, Agaricomycetes. 15 Aug. 2010, N. Sazanova (holotype MAG 3480, ITS and LSU sequences GenBank MK572960 and MK607461, MycoBank MB830213). Mature basidiomata epigeous or subhypogeous, secotioid, 1.5–3.3 cm broad, 1.5–2.7 cm high in dry specimens and 3–5 Additional materials examined. RUssIA, Magadan Region, Ten’kinsky dis- trict, Orotuk station, N62.03089° E148.65059°, on soil in mixed forests with cm broad, 5–7 cm high when fresh. Pileus completely enclos- Larix cajanderi and Betula middendorffii, 25 Aug. 1995, N. Sinelnikova, MAG ing the gleba, adpressed, subspherical to slightly irregular with 1339; Magadan Region, Srednekansky district, vicinity of Seimchan village, margin fused with stipe and partial veil. Surface mucous and meadow of Kolyma river, N62.83388° E152.43129°, on soil in wet mixed pale yellow in wet weather, yellow-brown in herbarium, covered forests with Larix cajanderi, Betula platyphylla, Salix spp., 28 Sept. 2018, by scales of yellowish brown stuck hairs. Context partly hygro- N. Sazanova, MAG 5122, ITS sequence GenBank MK572961. phanous, fleshy, white in central part, yellowish and thin under Notes — The greyish hymenophore and scales on the pileus peridium. Tubes disorganised, angular, big and different in size, indicate that our taxon belongs to a group of closely related fused with stipe and partial veil, lilaceous-grey. Stipe rudimental, species in Suillus viscidus s.lat. The main microscopic differ- conical, more or less centrally attached, in central part 0.5–0.8 ence of the new species from another species of this group is cm long and 0.2–0.5 cm broad in herbarium specimen, 1–3 in spore size and form. Suillus gastroflavus has broader spores, cm long and 1–1.5 cm broad when fresh, concolorous or the majority having a narrowed and elongated apiculus. Suillus lighter than pileus, covered by yellowish brown hairs. Context gastroflavus clearly differs from another known secotioid Suil­ hygrophanous, white in young specimens and yellowish to lus spp. by a greyish hymenophore. According to phylogenetic brownish in old. Basidiospores 10.3–13(–13.8) × 5.7–6.8(–7.2) analysis, the nearest species for the new taxon is Suillus visci­ μm, Q = 1.6–2.1(–2.3), ellipsoid, ovoid, inequilateral in profile, dus s.lat. Differences from other secotioid Suillus spp. ranged often with narrowed and elongated apiculus, moderately thick- 8–12 %. Suillus gastroflavus is a third known secotioid Suillus walled, brown, smooth. Basidia 22–32 × 6.5–9 μm, clavate to species and first secotioid Suillus taxon in Eurasia. subclavate, hyaline or with yellowish brown context in KOH. Cystidia 39–95 × 5.7–8.1 μm, cylindric and slightly widened in upper part, hyaline or with brown context in KOH, arranged in fascicles. Pileipellis ixocutis, covered by septate and swollen interwoven hyphae, 7–21 μm broad. Rhizopogon roseolus DQ179127 Rhizopogon luteolus EU784398 Suillus bresadolae GU187544 Suillus bresadolae L54084 Suillus viscidus JF908723 Suillus grisellus KX230582 Suillus grisellus KX230583 Suillus aeruginascens MK573972 Suillus laricinus LC029032 Suillus viscidus KJ415106 Suillus gastroflavus MK572960 Suillus gastroflavus MK572961 Gastrosuillus laricinus M91612 Gastrosuillus laricinus M91611 Suillus grevillei MK568018 Suillus clintonianus MK573973 Suillus grevillei KU059562 Suillus punctipes KU059605 Suillus punctipes KU059592 Suillus variegatus KU059626 Suillus variegatus KU059629 Suillus variegatus KU059628 Suillus umbrinus lU74619 Suillus suilloides U74618 Suillus suilloides U74617 Suillus suilloides U74616 Suillus amaranthii U74615 Suillus plorans KU059596 Suillus plorans KU059585 Suillus spectabilis KT964689 Suillus spectabilis KU721556 Suillus spectabilis L54104 ITS rDNA phylogenetic tree obtained with MrBayes v. 3.2.5 under GTR+I+G model for 10 M generations. The GenBank accession numbers are indicated Colour illustrations. Mixed forest with Larix cajanderi, Magadan Region, after species names. Support values are indicated on the branches (posterior Russia. Holotype basidiomata, spores and cystidia. Scale bars = 10 µm. probabilities). Scale bar = 0.1 expected substitution per site. Elena A. Zvyagina, Surgut State University, Surgut, Russia; e-mail: [email protected] Yury A. Rebriev, South Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia; e-mail: [email protected] Nina A. Sazanova, Institute of Biological Problems of the North, Far East Branch of the Russian Academy of Sciences, Magadan, Russia; e-mail: [email protected] Ekaterina F. Malysheva, Komarov Botanical Institute of the Russian Academy of Sciences, Saint Petersburg, Russia; e-mail: [email protected] © 2019 Naturalis Biodiversity Center & Westerdijk Fungal Biodiversity Institute.
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