. Guide to Sowerby's models of British fungi in the Department of Botany, British Museum (Natural History) . t on rotting stumps, and knownfrom every other British species of Polyporus by its shining-brilliantcrimson-chestnut pileus and stalk. This fungus has been found preserved in peaty beds in thefens of the eastern counties; it also occurs, with P. igniarius,P. fonientariHs, and Dcednlea quercina, in the lake-side pile-dwellingsof Switzerland and Italy. 131. Polyporus sulphureus Bull.—Pileus juicy-cheesy, fleshy,undulated, somewhat smooth ; flesh light sulphur-colour, oftensplitting, when
. Guide to Sowerby's models of British fungi in the Department of Botany, British Museum (Natural History) . t on rotting stumps, and knownfrom every other British species of Polyporus by its shining-brilliantcrimson-chestnut pileus and stalk. This fungus has been found preserved in peaty beds in thefens of the eastern counties; it also occurs, with P. igniarius,P. fonientariHs, and Dcednlea quercina, in the lake-side pile-dwellingsof Switzerland and Italy. 131. Polyporus sulphureus Bull.—Pileus juicy-cheesy, fleshy,undulated, somewhat smooth ; flesh light sulphur-colour, oftensplitting, when mature and vigorous containing sulphur-yellowmilk; pores minute, plane, sulphur-yellow; usually stem less. P. stilphweus, a beautiful and easily recognised species, grows,often caespitose, on living trees and stumps ; it is frequent on oldyews. A well-marked characteristic is its distinct sulphur-colour,sometimes spotted with saffron-red. This species is sometimesluminous. 132. Polyporus caesiusFr.—Pileus fleshy, unequal, silky; tubesvery small, unequal, long; pores torn into teeth. The tubes change. 56 GUIDE TO THE MODELS OF FUNGI. colour to a faint bluish-grey on being bruised, and by this characterit may be easily recognised. P. cccsius is a common fungus on dead firs, sometimes onrotten stem fragments. The whole plant is ivory-white, softish-tough,and stalkless. 133. Polyporus betulinus Fr.—Pileus white, then brownish,fleshy, corky, hoof-shaped, zoneless, edge obtuse, pellicle thin,cracking, and sometimes separating; tubes short, minute, whitish,at length separating. Common on living and dead trunks and branches of birch fromspring to early winter. This is the razor-strop fungus. Thick slicesof flesh cut from large examples are used as razor strops. The mycelium of this fungus sometimes forms sheets like hardleather beneath the bark of birches, and, without producing pilei,destroys the firmest wood. This leathery mycelium has beendescribed under the name of Xylostroma
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