238 HYDNEI. 



Hydnum. margin sterile beneath. Stem 12-18 mm. (%-% in.) long, 4-6 mm. 

 (2-3 lin.) thick, slender, somewhat equal, floccose, base tuberous. 

 Spines 2-3 mm. (1-1% lin.) long, slender, pallid then ferruginous. 

 Very like H. scrobiculatum. 



In fir woods. Rare. Aug.-Oct. 



Name zona, a zone. Zoned. Batsch f. 224. Fr. Hym. Eur. p. 605. 

 Berk. Out. p. 258. C. Hbk. n. 846. S. Mycol. Scot. n. 806. Nees Syst.f. 

 242. 



*** 



Spines unchangeable and spores 'whitish. 



12. H. nigrum Fr. Pileus azure-blue-black, zoneless, but with 

 a white margin when in fullest vigour, corky-rigid, club-shaped 

 when young, then turbinate, at length flattened, piano-depressed, 

 tubercular, tomentose, black internally. Stem 2.5 cent, (i in.) 

 long, stout, often rooting, unequal, black, tomentose at the base, 

 internally of the same colour. Spines awl-shaped, thin, rather 

 short, white. 



Csespitose, rarely scattered, growing into each other in various forms. 

 Inodorous. It differs from all others in being internally black. 



In pine woods. Street, Somerset. 



Sometimes zoned, as in the fig. of Fries. Spores round, papillose, 4 mk. 

 W.G.S. Name niger, black. Fr. Hym. Eur. p. 605. Icon. t. 5. f. 2. 



B. & Br. n. 1296. Seem. Jorirn. 1868, p. 334. Bath Trans. 1870, p. 86. 



C. Hbk. n. 847. B. pileus olivaceous-cinereous. Batsch f. 223. 



13. H. graveolens Delast. Pileus 2.5 cent, (i in.) and more 

 broad, black-fuscous, internally fuscous, margin whitish, coria- 

 ceous, thin, soft, zoneless, rugose, smooth ; flesh of the same 

 colour but paler. Stem 2.5 cent, (i in.) or a little more long, 

 scarcely 2 mm. (i lin.) thick, tough, very slender, equal, smooth, 

 even polished, fuscous-black. Spines curt, decurrent, grey. 



The pileus when dry becomes cinereous. It differs remarkably from neigh- 

 bouring species in its softer, thin substance, and in its odour which is almost 

 that of Melilot. Commonly densely gregarious or caespitose, but not growing 

 into each other. 



In fir woods. Rare. Sept.-Nov. 



Retaining its scent for years. Name graveolens (gravis-oleo), strong-smell- 

 g. Delast. Fr. Hym. Eur. p. 605. 

 C. Hbk. n. 848. S. Mycol. Scot. n. 807. 



ing. Delast. Fr. Hym. Eur. p. 605. Icon. t. 6./. i. Berk. Out. p. 258. 

 1. Mvcol. 



14. H. melaleucum Fr. Pileus black, coriaceous, thin, rigid, 

 irregular, striate, with little elevations at the disc, margin white. 

 Stem slender, smooth, black. Spines white. 



Inodorous. Pileus plane. 



