Polyporus mollissimus L.f. on a cotton stump of oodle fir. Described 7 April 1839. Effused, investing, thin, very white, margin fibrillo-sericeus, fine, minute, substriate, unequal. Now rather concave, closely investing the substratum of wood as if it pins. When young in fibrillo sericeus white with a cushion. The hymenium in some specimens has a pale (tawny?) hue especially when dry, with a low projecting filament, may be strained. Drenched in water make a clear, minute trans-lucence, somewhat along filaments along the strands