FRUITBODY annual, solitary, pileate, applanate, dimidiate to semicircular with a contracted base, up to 6 cm wide and long, up to 6 mm thick at the base, coriaceous to corky hard when dry. PILEUS glabrous, dull to semi-glossy, broadly zonate in flat to weakly sulcate zones, pale ochraceous to tan, a very thin cuticle absent or present, seen only in old and weathered specimens, margin sharp and entire. PORE SURFACE cream to ochraceous, darkens to pale cinnamon-fulvous in old specimens, pores round and entire, 4-6(7) per mm, tubes as pores, up to 3 mm deep. CONTEXT ochraceous to cork-coloured, 1-3 mm thick.
HYPHAL SYSTEM trimitic, generative hyphae with clamps, 2-3 µm wide, skeletal hyphae abundant, thick-walled, hyaline, 3-7 µm wide, binding hyphae also abundant, strongly branched with thick-walled to solid side branches, 3-5 µm wide. SPORES cylindrical to narrowly ellipsoid 6-7 × 2.5(3) µm.
HABITAT. On deciduous wood. DISTRIBUTION. Paleotropical species from Western Africa to Australia, but in Africa at least, a rare species and only one collection has been seen from East Africa, Kenya: Eastern Prov, Neyeri distr. Regati Forest Sta. Mt. Kenya (R. 9805, O).
REMARKS. The species is quite close to T. cingulata Berk. which, however, soon becomes sooty grey to black on the pileus and distinctly dull. However, the species is distinguished from T. cingulata by the spores as the latter has spores 5-6.5 × 3.5-4, i.e. broadly ellipsoid. T. marianna is characterized by the glabrous, semi-glossy pale tan pileus, commonly in wide and sulcate zones and the fairly small pores.