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Page number:213 
Remarks (public):Basidiocarps of C. focicola are distinguished from those of C. perennis by their larger pores and the absence of the antler-like hyphal elements found on the pilear surface of the latter. It also tends to occur singly or in small numbers on burnt soil and campfire sites. C. perennis often fruit in large numbers, commonly along trails or on disturbed sites. Microscopically the cylindrical spores will separate C. focicola from the more oblong-ellipsoid spores of C. perennis. Both have pilei that become pale and grayish with age in contrast to C. cinnamomea which are far more persistently dark brown and shiny. 
Description type:Non-original description 
Description:Coltricia focicola (Berk. & Curt.) Murr. - . Am. Fl. 9:92, 1908. - Polyporus focicola Berk. & Curt.. J. Linn. Soc. Bot. 10:305. 1868.
Basidiocarps annual, stipitate, pileus circular, often centrally depressed. 1-4 cm in diameter, margin often incised or lobed. tough and coriaceous when fresh, more brittle when dry. upper surface first rusty brown to cinnamon, becoming more grayish from the center and with age brownish gray, tomentose, multizonate, in dry condition usually with radial wrinkled ridges, stipe cinnamon to rusty brown, finely tomentose to velvety, 1.5-5 cm long and 2-5 mm in diameter, pore surface cinnamon to rusty brown, pores angular. thin-walled, in age pore-mouths becoming lacerated and more irregular. usually 1-2 per mm and not decurrent on the stipe, but often larger pores do occur near the stipe and then somewhat radially elongated. up to 2 mm in longest dimension. tubes rusty brown. up to 5 mm deep. context cinnamon, dense 1-2 mm thick.
Hyphal system monomitic with two types of generative hyphae, a) straight to sparingly branched, 4-8 µm wide, and with a wide lumen, yellow to pale rusty brown and with numerous simple septa. this type predominant in the trama and the context, b) strongly branched and twisted, narrow, 2-4.5 µm wide, and with few simple septa. hyaline to pale golden yellow, most common in the stipe-context, only scattered in the pileus context. the latter hyphae simulate binding hyphae and make the stipe harder than the context in the pileus.
Setae none.
Basidia clavate, 18-23 x 7-8 µm, 2 to 4-sterigmate, simple septate at the base. Basidiospores cylindrical to cylindric-ellipsoid. hyaline to golden yellow, weakly dextrinoid in Melzer's reagent, 8-11 x 4-5 µm.
Type of rot. Terrestrial, evidently not a wood-rotting fungus.
Cultural characteristics. Unknown.
Sexuality. Unknown.
Substrata. On the ground, usually on burnt over soil, or around old campfire sites. Distribution. Apparently arare fungus in Europe. reported by Pilat from the Carpathians (as Polystictus perennis va. focicola). Also known from Mongolia and eastern North America.
 
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