Agarikon

Fomes laricis (Jacq.) Murrill, Bull. Torrey
Club 30: 230. 1903.
Boletus Laricis Jacq. Misc. Austr. 1 : 164. 1778.
Boletus officinalis Vill. Hist. PI. Dauph. 3: 1041. 1789.
Boletus pur gans Pers. Syn. Fung. 531. 1801.
Polyporus officinalis Fries, Syst. Myc. 1 : 365. 1821;
Fomes albogriseus Peck, Bull. Torrey Club 30 : 97. 1903. (Type from Michig-an.)
Pilaus firm, at length fragile, ungulate to cylindrical, 3-8X5-10X4-20 cm.; surface anoderm, powdery, white or slightly yellowish, concentrically sulcate, becoming slightly encrusted, tuberculose and rimose ; margin obtuse, concolorous : context soft, tough, at length friable, chalk-white or slightly yellowish, very bitter, with the odor of fresh meal, 1-3 cm. thick ; tubes evenly stratified, concolorous, 5-10 mm. long each season, mouths circular to angular, 3-4 to a miji., edges thin, fragile, white, becoming discolored and lacerate, wearing away with age: spores ovoid, smooth, hyaline, 4X5//; hyphae 5^"; cystidia none.
Type locality : Austria.
Habitat : In EJurope, on living larch ; in America, on living larch, pine and spruce. Distribution : Michigan, Montana, California, and British Columbia ; also in Europe and Asia.