Polyporales » Polyporaceae


Atroporus Ryvarden 1973, in Palacio et all., Plos one, 12(10), e0186183 (2017).

            Diagnosis: Basidiomata annual to biannual, centrally to eccentrically stipitate; pileus circular; pilear surface glabrous, radially striate to finely wrinkled, dark purplish red to blackish; margin sterile, with a black cuticle. Pores circular. Context homogenous, light brown. Stipe cylindrical, solid, bearing a black cuticle (Fig 2E, 2F, 2G and 2H). Hyphal system dimitic with generative and skeletal-binding hyphae; generative hyphae with clamp connections; skeletal-binding hyphae from the context and stipe usually dominating, arboriform, hyaline, IKI; skeletal-binding hyphae in the trama of tubes dextrinoid, with differentiated and wide stalk, and sharply pointed apex. Basidia clavate, 4-sterigmate. Basidiospores narrowly ellipsoid to subcylindrical, thin-walled, smooth, hyaline, IKI- (Figs 3A, 3C, 3E, 3F, 4A, 4B, 4C1 and 4C2).

Index Fungorum Number: IF17126

Type Species: Atroporus diabolicus  (Berk.) Ryvarden 1973, in Palacio et all., Plos one, 12(10), e0186183 (2017).

Notes: Basidiospores descriptions and Melzer reagent reaction of the skeletal-binding hyphae are new diagnostic information for the genus. Atroporus resembles morphologically Polyporus sensu lato and Echinochaete Reid, however, the combination of narrowly ellipsoid to subcylindrical basidiospores, strongly dextrinoid skeletal-binding hyphae with a differentiated apex, and the black cuticle on the pileus are unique to the group Atroporus. All the species grow on dead wood, typically dead fallen branches of relatively thin diameter (up to 10 cm diam.) and cause white rot on the substrate. So far the genus is only known for the neotropics.


Atroporus diabolicus (Berk.) Ryvarden 1973

Atroporus infernalis (Berk.) Ryvarden 1973

Atroporus rufoatratus (Berk.) Palacio, Reck & Robledo 2017

Atroporus tagaeri Toapanta-Alban, Ordoñez & Blanchette 2021

Atroporus yasuniensis Toapanta-Alban, Ordoñez & Blanchette 2021



Palacio, M., Robledo, G. L., Reck, M. A., Grassi, E., Góes-Neto, A., & Drechsler-Santos, E. R. (2017). Decrypting the Polyporus dictyopus complex: Recovery of Atroporus Ryvarden and segregation of Neodictyopus gen. nov. (Polyporales, Basidiomyocta). Plos one, 12(10), e0186183.


About Basidiomycota

The webpage Basidiomycota provides an up-to-date classification and account of all genera of the phylum Basidiomycota.


Supported by 

Thailand Science Research and Innovation (TSRI)

project entitled:

"Macrofungi diversity research from the Lancang-Mekong Watershed and surrounding areas"

(Grant No. DBG6280009)


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