Hyphodermella brunneocontexta sp nov (Basidiomycota, Polyporales) from the island of Mayotte (France)

Hyphodermella brunneocontexta sp. nov. (Basidiomycota, Hymenochaetales), collected in Mayotte (France, Comoros archipelago, Indian Ocean), is described and illustrated. The new species is characterized by a resupinate basidiome with many, very small aculei, locally with odontioid appearance, with apically projecting, heavily encrusted single to three or four congregated hyphae, a monomitic hyphal system with simple septate hyphae, clavate or subcylindrical, sometimes stocky basidia, and ellipsoid, oboval to subglobose, smooth, thin-walled, non-amyloid spores. The most important feature is the brown context with thick-walled hyphae, densely interwoven, welded together, sometimes forming a pseudoparenchymatic texture, particularly in the subiculum, which, in addition, is crammed with crystal conglomerates.