POLYPORUS 583 



C. P. firm, tough, subcoriaceous, corky, or leathery. Caespitose. 



1927. P. giganteus (Pers.) Fr. (= Polyporus acanthoides (BuU.) Quel.) 

 Boud. Icon. t. 153. yi>ya<;, a giant. 



P. 10-80 cm., date brown, at first pale, then brownish yellow, disc at 

 length black, densely imbricated, dimidiate, very broad, flaccid, sub- 

 zoned, rivulose, depressed behind, cuticle breaking up into granules 

 or fibrillose squamules. St. 3-10 x 2-5 cm., whitish, connato-branched 

 from a common tubercle, sometimes wanting. Tubes whitish, decur- 

 rent, 1-2 mm. long; orifice of pores whitish, becoming fuliginous and 

 black when touched or rubbed, round, or angular, minute. Flesh white, 

 becoming black, tough, subcoriaceous. Spores white, globose, 4-5 /A, 

 with a large central gutta. Smell sour. Taste unpleasant. Forming 

 dense masses at the base of beeches, oaks, elms, chestnuts, and 

 robinias. July Jan. Common, (v.v.) 



1928. P. acanthoides (Bull.) Fr. aicavdos, acanthus; etSos, like. 

 P. 590 cm., ferruginous, or pale chestnut, densely imbricated, in- 



fundibulif orm, inciso-dimidiate, subzoned, longitudinally rugose, thin. 

 St. white, then rufescent, connato-branched. Tubes white, then rufescent, 

 short; orifice of pores white, then rufescent, lamelloso-sinuate, thin, 

 toothed. Flesh faintly rufous, thin, 4-6 mm. thick, pliant, then 

 coriaceous. Spores white, "subglobose, 4 x 3/u," Massee. In dense 

 clusters on trunks, roots, and buried wood. Sept. Rare. 



1929. P. alligatus Fr. (= Polyporus imberbis (Bull.) Quel.) 



Alligatus, bound up. 



P. 2-5-8 cm., tan isabelline, imbricated, unequal, very variable, 

 irregularly club-shaped, or variously expanded, dilated, often circular 

 in outline, undulate, villose, sessile. Tubes white, short; orifice of 

 pores white, minute, readily stopped up with flocci. Flesh paler, rigid, 

 fibrous. Spores "pale, elliptical, 6 x 7/u," Massee. On roots, often 

 wrapping round stipules and grasses. Sept. Rare. 



1930. P. heteroclitus (Bolt.) Fr. Bolt. Hist. Fung. t. 164, as Boletus 

 heteroclitus Bolt. erepo/eXtTo?, leaning to one side. 



P. 6 cm., orange, sessile, flat, expanded on all sides from a radical 

 tubercle, lobed, villose. Tubes golden yellow, short; orifice of pores 

 yellow, becoming brownish, irregular, and elongate. On the ground 

 under oaks. Jan. Rare. 

 P. salignus Fr. = Daedalea saligna Fr. 



B. Sessile. 



VI. P. with a rigid crust, often resinous. Tubes heterogeneous, separable ; 

 pores round, rarely polygonal. Spores white, or slightly coloured. 

 Cystidia coloured, or none. Annual. Growing on wood. 



