Erythrophylloporus Ming Zhang & T.H. Li, Mycosystema 37(9): 1111-1126 (2018)

Vadthanarat, Santhiti, Amalfi, Mario, Halling, Roy E., Bandala, Victor, Lumyong, Saisamorn & Raspe, Olivier, 2019, Two new Erythrophylloporus species (Boletaceae) from Thailand, with two new combinations of American species, MycoKeys 55, pp. 29-57 : 29

Erythrophylloporus Ming Zhang & T.H. Li, Mycosystema 37(9): 1111-1126 (2018)

Description.

Basidiomata stipitate-pileate with lamellate hymenophore, small to medium-sized; Pileus subhemispheric to convex when young becoming convex to plano-convex to plano-subdepressed when old, dry, pruinose or velutinous, subtomentose to tomentose, yellowish-orange to red; pileus context vivid yellow to yellowish-orange. Hymenophore lamellae, slightly thick, decurrent, deeply yellowish-orange to deep orange or reddish-orange to orange red or brownish-orange to red. Stipe central to slightly excentric, cylindrical or clavate, yellowish- to reddish-orange to yellowish red, with scattered yellowish- to reddish-orange to red scales on surface, with bright yellow basal mycelium; stipe context solid, yellow to reddish-yellow or yellow with olivaceous brown. Staining none or slightly reddening or greening or gradually bluing or dark violet, greyish to blackish-blue when bruised on the basidiomata or context or lamellae. Spore print olivaceous brown. Basidiospores ovoid or ellipsoid to broadly ellipsoid to subovoid, thin-walled, with non-bacillate surface. Basidia clavate to narrowly clavate. Cheilocystidia and pleurocystidia present, subcylindrical or narrowly conical to narrowly fusiform to ventricose with slightly or obtuse apex, thin-walled, sometimes thick-walled, originating more or less deeply in the sub hymenium or from hymenophoral trama, hyaline or sometimes containing yellowish-brown pigments. Pileipellis a subcutis to cutis to trichoderm to palisadoderm, composed of thin to slightly thick-walled hyphae. Clamp connection absent in all tissues.

Typus species.

Erythrophylloporus cinnabarinus Ming Zhang & T.H. Li.

Known Distribution.

Asia (China and Thailand), North America (Mexico) and Central America (Costa Rica).

Remarks.

Erythrophylloporus is easily distinguished from other lamellate Boletaceae genera by a combination of the following characters: the intense orange to red colour of the pileus and lamellae; bright yellow basal mycelium; ovoid or ellipsoid to broadly ellipsoid to subovoid basidiospores with non-bacillate surface; pleurocystidia originating more or less deeply in the subhymenium or from hymenophoral trama.