346 POLYPORACEiE Polypoms 



walnut, lime, oak, elm, Euonymus ; common. May-Feb. P. ioj in. 

 Close to the bark of the tree the pubescence often resembles Ozonium 

 auricomum ; see 237. Sometimes 1 8 in. in diam. Becomes dense and 

 fibrous in age. Tubes sometimes distilling drops of water ; becoming 

 wholly black in age. 



1570. P. euticularis Fr. (from its thinness, skin-like, as compared 

 with 1569 ; cuticula, a thin external skin) a b c. 



P. thin, subrugose, hairy or tomentose, obscurely zoned, yellow- 

 buff to deep vinous-brown. T. somewhat long. Po. minute, 

 vinous- or orange-brown, not dark. Flesh vinous-brown, 

 not dark. 



Single to 3-imbricate. Trunks, beech, fir. Nov. -Dec. P. 5! in. Bearing 

 the same relationship to 1569 as 1544 does to 1543. 



1571. P. spumeus Fr. (from its early condition of frothy-softness ; 



sfiuma, froth). Ivory- or ochre-white. 



P. pulvinate, gibbous, somewhat thick, rugoso-hispid to plane. 



T. somewhat short. Po. minute. 



Single to 3-imbricate. Trunks and stumps, hornbeam, elm, apple, ash, 

 willow, beech, birch, oak. July-Oct. P. 7^ in. 



1572. P. borealis Fr. (from its being common in northern latitudes ; 



borealis, northern) a c. White to yellowish-buff. 



P. subpulvinate, hairy, somewhat thick, fibrous. Po. small, 



sinuoso-flexuous, torn ; marg. barren. 



Single to 3-imbricate. Stumps, pine, fir, spruce. Sept. P. 3§ in. 

 Hartig states that this fungus is the cause of "white-rot" in spruce. 

 Berkeley considers that Ceriomyces {Ptychogaster) albus may be an imperfect 

 state of this species or of 1559. 



b. Plaeodermece. 



1573. P. dryadeus Fr. (from its habitat, oak, Gr. drus) a b c. 



P. pulvinate, thick, rugged to smooth, somewhat ferruginous, 

 becoming fuscous. T. long, pale ferruginous. Flesh vinous- 

 sienna, not dark, streaked and zoned darker. 



Single to 2-imbricate. Taste somewhat acid or astringent. Trunks, oak, 

 beech ; frequent. July-Oct. P. 9 in. Exuding drops all over, which 

 become black in drying. 



1574. P. betulinus Fr. (from its habitat, birch, betula) a b c. 



P. hoof-shaped, zoneless, smooth, thick, the vertex in the form of 

 an urn. or short stem, pellicle thin, cracking, pale umber- 

 whitish, becoming darker. T. very short. Po. minute, white. 



Trunks, branches, birch ; common. May-Jan. P. 8 in. Pores sometimes 

 stained by Hypomyccs rosellus and Hypocrea ochracea. Used by rustics in 

 past times for razor-strops. Said by Hartig to cause the "red-rot " of birch. 



1574a. P. benzoinus Fr. (from its odour of benzoin) a. 



P. woody, conchiform, but constricted at the base, fuscous- 

 rubiginous, somewhat zoned, rugose when dry, and becoming 

 darker. T. long. Po. at first whitish, then ferruginous. 

 Flesh yellowish-white. 

 Subimbricate. Fallen cedars. Jan. P. 7 in. •; Sweet-scented, odour retained 

 in drying. Allied to Trametes. 



