Hemiaustroboletus Ayala-Vasquez , Garcia-Jimenez & Garibay-Orijel, 2022

Ayala-Vasquez, Olivia, Garcia-Jimenez, Jesus, Aguirre-Acosta, Elvira, Castro-Rivera, Rigoberto, Angeles-Argaiz, Rodolfo Enrique, Saldivar, Angel Emmanuel & Garibay-Orijel, Roberto, 2022, Hemiaustroboletus, a new genus in the subfamily Austroboletoideae (Boletaceae, Boletales), MycoKeys 88, pp. 55-78 : 55

Hemiaustroboletus Ayala-Vasquez, Garcia-Jimenez & Garibay-Orijel gen. nov.

Diagnosis.

Hemiaustroboletus is characterised by small and medium basidiomata with slightly ornamented pileus surface, stipe fibrillose to striated without veil, slightly verrucose or cracked to pitted basidiospores and pileipellis formed by an ixotrichoderm or trichoderm.

Etymology.

From the Latin hemi "almost or half", Austroboletus the generic epithet refers to the morphological affinities with this genus.

Generic type.

Hemiaustroboletus vinaceobrunneus Ayala-Vásquez, García-Jiménez & Garibay-Orijel sp. nov.

Generic Description.

Epigeous, stipitate-pileate basidiomata. Pileus reddish-brown, violet-brown, dark violet, reddish-brown, orange-brown, yellow-brown, cinnamon, dry surface, finely velvety, velutinous, rivulose, granular-tomentose, subtomentose, minutely areolate. Hymenophore tubular, circular to angular pores, whitish, pink-purple, lilac, magenta-grey, brown-violet to pinkish-brown, with or without change brown when cut. Context whitish to pale red. Stipe subclavate, tomentose, pruinose, granular furfuraceous, striate surface, longitudinally fibrous, very finely reticulated in tapering towards apex. Whitish basal mycelium. Basidiospores ornamented, slightly verrucose, cracked to pits, fusoid, oval-elliptical, cylindrical to subfusoid, oblong, ovoid-oblong. Cystidia clavate, sphaeropedunculate, subfusoid. Pileipellis an ixotrichoderm or trichoderm; terminal cells cylindrical, fusoid, ventricose-rostrate with or without encrustations in the wall. Caulocystidia fusoid, cylindrical to subclavate and tetrasporic caulobasidia.

Distribution.

Canada, China, Japan, Mexico, South Korea and United States.

Ecology.

Temperate and subtropical forests, with conifers and broadleaf trees ( Abies spp., Quercus spp., Pinus spp.) from 2000 to 3000 m alt.