Pluteus thoenii Menolli & Minnis, 2014

Jr, Nelson Menolli, Justo, Alfredo, Arrillaga, Pedro, Pradeep, C. K., Minnis, Andrew M. & Capelari, Marina, 2014, Taxonomy and phylogeny of Pluteus glaucotinctus sensu lato (Agaricales, Basidiomycota), a multicontinental species complex, Phytotaxa 188 (2), pp. 78-90 : 88-89

publication ID	https://doi.org/ 10.11646/phytotaxa.188.2.2
persistent identifier	https://treatment.plazi.org/id/0D5387C7-4F44-FFCD-A5C0-FC836F404886
treatment provided by	Felipe
scientific name	Pluteus thoenii Menolli & Minnis
status	sp. nov.

Treatment

Pluteus thoenii Menolli & Minnis View in CoL , sp. nov. ( Fig. 6 View FIGURE 6 )

MycoBank: MB 809617

Diagnosis: —Similar to P. glaucotinctus but differing in the nrITS sequence ( HM562132 View Materials ) and in having predominantly subglobose basidiospores (Qm = 1.15) and longer cheilocystidia (up to 94 µm long).

Type: — DEMOCRATIC REPUBLIC OF THE CONGO. Haut-Katanga : Kipopo, 19 December 1972, Thoen 5546 (Holotype BR!; nrITS: HM 562132 View Materials ; tef1: KJ 010051 View Materials ) .

Basidiospores [30/1/1] 6.5–8.5(–9.0) × 5.5–7.5 μm (Q = 1.10–1.17; Qm = 1.15; Lm = 7.7 μm; Wm = 6.7 μm), subglobose to broadly ellipsoid, inamyloid, hyaline, smooth, thick-walled. Pleurocystidia 55–85 × 18.0–32 µm; ovoid, clavate or oblong, with rounded apices, colorless, thin-walled. Cheilocystidia 53–94 × 12.0–15.0 µm; narrowly utriform, cylindrical, lageniform, flexuous, colorless, thin-walled. Pileipellis a cutis; terminal elements 70–105 × 10.0–20 µm; cylindrical or tapering towards apex; colorless or with brown pigments; thin-walled. Stipitipellis a cutis; hyphae 5.0– 15.0 µm wide; colorless; thin-walled. Clamp-connections not observed.

Etymology: — thoenii in honor of the collector of the holotype, Daniel Thoen, and for his contribution to the knowledge of fungi from tropical Africa.

Distribution: —Africa: Known only from Democratic Republic of the Congo.

Specimen examined: — DEMOCRATIC REPUBLIC OF THE CONGO. Haut-Katanga : Kipopo, 19 December 1972, Thoen 5546 ( BR!; nrITS: HM 562132 View Materials ; tef1: KJ 010051 View Materials ) .

Notes: —Despite the lack of macro-morphological data from fresh collections of P. thoenii , we consider the DNA sequences, the shape of the basidiospores (Qm = 1.15) and the size of the cheilocystidia (up to 94 µm long) as sufficiently distinctive characters to propose this new species. Pluteus thoenii has been up until now only represented by the holotype, which represents a single herbarium collection from more than 50 years ago that was previously identified by Horak & Heinemann (1978) as P. glaucotinctus .