Trichaptum biforme (Fr.) Ryvarden 1972

Coriolus prolificans (Fries) Murrill
Polyporus prolificans Fries, Epicr. Myc. 443. 1838.
Polyporus laceratus Berk. Ann. Mag. Nat. Hist. 3: 392. 1839. (Type from I^ouisiana.) Polyporus Flabellum Mont. PI. Cell. Cuba 388. pi. 15. f. 2. 1842. (Type from Cuba.) Polyporus Menandianus Mont. Ann. Sci. Nat. II. 20 : 362. 1843. (Type from New York.) Polyporus subflavus I^€v. Ann. Sci. Nat. Ill, 5 : 300. 1846. (Type from New York.) Polypoftis xalapensis Bepk. Jour. Bot. & Kew Misc. 1 : 103. 1849. (Type from Mexico.) Polyporus Sartwellii Berk. & Curt. Grevillea 1 : 51. 1872. (Type from New York.) Polyporus ilictncola Berk. & Curt. Grevillea 1 : 52. 1872. (Type from Alabama.) Polyporus pseudopargamenus "Dixim.. Myc. Univ. no. 1102. 1878. (Type from New York.)
Pileus exceedingly variable, sessile or affixed by a short tubercle, dimidiate to flabelliform, broadly or narrowly attached, 2-5X2-6X0.1-0.3 cm. ; surface finely villose-tomentose, smooth, white or slightly yellowish, marked with a few narrow indistinct latericeous or bay zones ; margin thin, sterile, entire to lobed : context very thin, white, fibrous ; tubes 1-3 mm. long, white to discolored within, mouths angular, somewhat irregular, 3-4 to a mm., usually becoming irpiciform at an early stage, edges acute, dentate, becoming lacerate, white to yellowish or umbrinous : spores smooth, hyaline.
Type locality : Mexico.
Habitat : Dead deciduous trunks.
Distribution : Canada to Florida and west to Wisconsin and Mexico ; also in Europe.

Coriolus biformis (Klotzsch) Pat. Tax. Hymen. 94. 1900
1 Boletus cervinus Schw. Schr. Nat. Ges. Leipzig 1 : 96. 1822. (Type from North Carolina.)
Polyporus bifoi'mis Klotzsch, Linnaea 8 : 486. 1833.
Polyporus molliuscuhis Berk. Lond. Jour. Bot. 6^: 320. 1847. (Type from Ohio.)
Polyporus carolinensis Berk. Jour. Bot. & Kew Misc. 1 : 102. 1849. (Type from South Carolina.)
Polyporus chariaceus Berlc. Jour. Bot. & Kew Misc. 1 : 103. 1849.— Grevillea 1 : bl>. 1872. (Type
from North Carolina.) Polyporus scurrosus B. & C. Grevillea 1 : ,52. 1872. (Type from North Carolina.)
Pileus effused-reflexed, imbricate, laterally connate, the reflex^d portion dimidiate, conchate, 2-5X5-12X0.3-0.7 cm. ; surface white, obscurely zonate, nearly smooth, somewhat silky, fibrillose-tomentose ; margin acute or obtuse, undulate to lobed : context softcorky, white, 1-2 mm. thick ; tubes 3-5 mm. long, white to discolored within , mouths large and irregular, variable in size, averaging 2 to a mm., edges thin, lacerate-dentate, white to discolored or light-bay: spores oblong, slightly curved, smooth, hyaline, 7-9X2.5-3/^ ;
hyphae 4/^ ; cystidia none.
Type locality : Boreal North America. Habitat : Dead deciduous wood of various kinds. DiSTRiBiTTiON : Canada to Florida and west to Iowa and Kansas.

Trichaptum biforme is a species of poroid fungus in the order Hymenochaetales. It is a saprobe that decomposes hardwood stumps and logs. It is inedible. It is widely distributed and occurs on at least 65 tree hosts, but rarely on conifers. It is sometimes confused with Trichaptum abietinum, which grows almost exclusively on conifers.