Inonotus luteoumbrinus (Romell) Ryvarden 2005

Pyropolyporus sublinteus Murrill, sp. nov
Pileus corky to soft-woody, dimidiate, applanate, 6-8 X 7-10 X 1-2 cm.; surface finely tomentose to glabrous, very thinly encrusted, smooth, almost free from markings of any kind, light-bay to almost black; margin thin, rarely lobed, tomentose, ferruginous: context corky, slightly zonate, melleous, 3-10 mm. thick; tubes distinctly stratified, separated by layers of contexj:, 2-6 mm. long each season, umbrinous within, mouths subcircular, 7 to a mm., edges thin, entire, becoming umbrinous : spores globose, smooth, brown, 5 // 1 hyphae 8 // ; cystidia none.
Stalle^^&fdTs^tlf" '^"'P'^^^^^'^P^' Mexico, on decayed wood of mesquite, March, 1889, Lulu Distribution : Known only from the type locality.