Neofavolus subpurpurascens (Murril) Palacio & Robledo, 2019

Palacio, Melissa, Silveira, Rosa Mara Borges Da & Robledo, Gerardo Lucio, 2019, Neofavolus subpurpurascens comb. nov., with new records from the Neotropics, Phytotaxa 405 (4), pp. 180-186 : 183-184

Neofavolus subpurpurascens (Murril) Palacio & Robledo comb. nov.

MycoBank MB 826917

Basionym: Hexagonia subpurpurascens Murrill , North American Flora 9(1): 51 (1907).

Synonyms: Polyporus subpurpurascens (Murrill) Ryvarden, Mycotaxon 23: 181 (1985); Favolus subpurpurascens (Murrill) Sacc. & Trotter, Syll. fung. (Abellini) 21: 357 (1912).

Description:—Basidiome annual, fragile, centrally to laterally stipitate, solitary or clustered in small groups (2–3 basidiomes); pileus circular to reniform, centrally depressed, up to 2 cm diam., 0.1 cm thick, glabrous, azonate, light purplish, slightly tessullate when living, purplish ochraceous and tessellate when dry; stipe up to 2 cm long., 0.3 diam., light yellowish brown to purplish, with reddish dyes, more purplish and thicker towards the base, with a whitish attachment disc, smooth to longitudinally rugose when dry; margin acute, incurvated when dry; context thin (0.2 mm thick) to absent. Pore surface light brown yellowish, pores 1–2/mm, angular, hexagonal, radially elongated, decurrent, with hyphal pegs. Hyphal system dimitic: generative hyphae clamped, hyaline, thin walled, 3–6 μm diam., skeletobinding hyphae arboriform, hyaline to yellowish, thick walled, with a wide lumen 3–6 um diam. (in the principal stalk) or 2–3 μm diam. (in the branches), IKI–. Hyphal pegs 23–26 μm diam., composed of generative hyphae. Pileipellis present as a cutis composed of light brown, parallel, agglutinated, thick-walled generative hyphae, distinct from the contextual hyphae, which are hyaline, interwoven and non-agglutinated ( Fig. 2 ). Basidia 18–22 × 6–8 μm, 4-sterigmate, clavate. Basidiospores 9–12 × 2,5–4 μm, Q= 3.2, n= 100/5, narrowly cylindrical, with a slightly supraapicular depression, smooth, thin walled, hyaline, guttulate, IKI-.

Geographical distribution:— Neofavolus subpurpurascens is a rare species, described from Jamaica and also recorded in Brazil ( Coelho & Silveira 2014). This is the first record from Argentina and Bolivia.

Remarks:— Neofavolus subpurpurascens is a species recognized by its purplish basidiomes, compared to other Neofavolus taxa, which are white to cream or brownish ( Sotome et al. 2013; Seelan et al. 2015). The specimens under study match the macro and microscopical descriptions based on the type collection provided by Ryvarden (1985) and ( Coelho & Silveira 2014). Also we examined type material through NY virtual herbarium. Additionally, we found that the pilear surface is a cutis composed of light brown, parallel, agglutinated, thick-walled generative hyphae ( Fig. 2c ). Specimens:— ARGENTINA. Jujuy: Ledesma, Parque Nacional Calilegua, Mesada de las Colmenas, La Cascada trail, on dead twig, 1170 m, 23°42’1.5’’S, 64°51’56.8’’W, 6 March 2005, Robledo 383 (CORD); Robledo 385 (CORD); Robledo 390 (CORD);— BOLIVIA. La Paz: Nor Yungas, Rio Yariza, 23 February 1956, Singer B1346 (LIL);— BRAZIL. Rio Grande do Sul: Santa Maria, Seminários São José, 23 March 2007, Coelho & Cortez 624–1 (ICN); Coelho & Cortez 624–2 (ICN).

Figures

FIGURE 2. Morphological characteristics of N. subpurpurascens. a. pore surface detail. (Robledo383). b. pilear surface detail (Robledo390). c. pileipellis detail (CG624–1), cutis composed of light brown, parallel, agglutinated, thick-walled generative hyphae. d basidiospores (CG624–1). Scale bar: a,b=1cm; c,d=10 μm.