]28 THE CHICAGO ACADEMY OF SCIENCES 



Spores globose, uninucleate, 5 /x. Plant generally 5 to 10 

 cm. high. 



On a dead, prostrate trunk, open woods, near Wheaton. 

 September, 1897. A single specimen. The largest mass was 

 about 10 cm. in diameter; near it were several immature ones, 

 2.5 to 5 cm. high and broad. Edible, but somewhat tough. 



" Growing in abundance on a log in woods south of Naperville, 

 1902." (Umbach.) 



Hydnum erinaceum Bull. 



Pileus white, becoming yellow, fleshy, elastic-tough,p endulous, 

 tubercular, immarginate, torn into fibrils above. 



Aculei very long, straight, equal, pendulous. 



A single plant was found growing out of a decayed spot in the 

 trunk of living Quercus, in woods at Winfield. October, 1904. 

 The specimen was globose, pure white, 3 cm. in diameter, wholly 

 covered with slender spines. 



Hydnum caput-Ursi Fr. (Plate XIX, Fig. 1.) 



White, fleshy, substipitate, tuberculiform, the body covered 

 with short branching processes which bear the spines. 



Spines terete, somewhat flexuous, 12 to 25 mm. long. 



A single plant was found on the dead trunk of a fallen Hicoria 

 ovata, near Wheaton, November, 1900. It was still in vigorous 

 growth, although the upper portion had been blackened by frost. 

 It measured 22 cm. in length by about 11 cm. in height. The 

 species has also been collected by Prof. Umbach, near Naperville. 

 Hydnum septentrionale Fr. (Plates XX, XXI.) 



Fleshy-fibrous, tough, pallid; pilei innumerable, plane, scalari- 

 form, connate behind into a thick solid body, the margin straight, 

 entire. 



Aculei crowded, slender, equal. In woods, on standing 

 trunks. 



A single specimen was found by Mr. Gammon, growing near 

 the base of an oak tree near Evanston. September, 1900. A 

 single specimen found by Mr. Bates, growing in the decayed trunk 

 of a living apple tree, La Grange. November, 1902. The plants 

 give out a strong, unpleasant odor in drying; this persists in the 

 dried plants for years. The photographs are of plants collected 

 in Northern Michigan. 



Hydnum ochraceum Pers. 



Pileus effused-reflexed, coriaceous, thin, zonate, ochraceous. 



Spines minute, o.chraceous-flesh-color. 



On the under side of dead sticks and fallen branches. Fre- 

 quent. Pileus 2.5 to 7.5 cm. broad when well grown, but fre- 

 quently more or less resupinate. 

 Hydnum pallidum C. & E. 



White, effused, subiculum membranaceous, soft, margin vil- 

 lous. 



