242 FUNGUS-FLORA. 



then brownish-orange ; pores irregular and elongated, yellow, 

 then brownish. 



Polyporus heteroditus, Fries, Syst. Myc. i. 344; Berk., 

 Eng. Flora, vol. v. p. 135; Cke., Hdbk., p. 269. 



Boletus heteroditus, Bolton, t. 164. 



On the ground, growing from stumps, partly covered 

 with soil. 



Pileus 2^ in. broad ; it shoots out several flat pieces from 

 a hard and coriaceous root, which is white within, lying on 

 the surface of the earth in a horizontal direction. Pores 

 very variable in size and form. (Purton, MS.) 



Polyporus salignus. Fr. 



Tufted, coriaceous, soft, elastic, pilei dimidiate, imbricated, 

 flattened and more or less reniform, whitish, covered with 

 adpressed down, grooved near the tumid, more or less lobed 

 margin ; pores crowded, thin, elongated, intricately waved, 

 white. 



Polyporus salignus, Fries, Epicr., p. 452; Hym. Eur., p. 

 544; Cke., Hdbk., p. 269. 



On decaying willows. 



Pilei imbricated, white, 24 in. across, rather thick. In- 

 odorous. 



Polypoms spongia. Fr. 



Caespitose, much divided ; pilei 3-6 in. across, spongy, 

 soft, very numerous, dimidiate, connate in large, dense 

 tufts, becoming almost plane, wrinkled and rugulose, 

 strigoso- velvety, ferruginous -brown, when dry almost 

 orange-brown, flesh about ^ in. thick, margin thin, soft, 

 fibrous, bright brown ; pores short, about ^ in., rather small, 

 entire, sulphur-coloured, then brownish ; spores elliptical, 

 very pale yellow, almost colourless, 7 x 4 p.. 



Polyporus spongia, Fries, Monogr. ii. p. 268 ; Fries, Hym. 

 Eur., p. 542 ; Fries, Icones, t. 180, f. 2. 



On dead trunks of pine, &c. Allied to Polyporus 

 ScJiweinitzii, but distinguished by the usually densely 

 tufted habit, brighter colour, and shorter, small, entire 

 pores, which average about |- mm. across. A yellow-brown 

 colouring-matter present in every part is soluble in an 

 alkaline solution or in methylated spirit. 



