44 BULLETIN 175, U. S. DEPARTMENT OP AGRICULTURE. 



Hydnum imbricatum. 



In this species the plants are terrestrial and provided with a stipe. The cap is 

 convex and nearly expanded, fleshy in the center, thinner toward the margin, surface 

 scaly, especially toward the center. The scales may be imbricated, sometimes 

 zonately arranged, or the flesh broken up in a tessellated manner. The cap varies 

 from mouse color to dark brown, with the stem of the same color. The teeth, are 

 coarse, terete, tapering, light brown to ashy. Hydnum imbricatum is of fairly wide 

 geographic range and grows on the ground, especially in pine and chestnut woods. 

 It is edible, but slightly bitter. (PL XXXIII, fig. 1; from F. E. Clements.) 



Hydnum repandum. 



This species is also terrestrial and the stem central or excentric. The cap is more 

 or less irregular, margin repand or wavy, color variable, ranging from light buff to 

 brown or reddish; flesh whitish, compact, and fragile. The teeth are white, conical, 

 and brittle. The stem is thick, even or clavate. Hydnum repandum is quite com- 

 mon and may be found from July to November in woods on the ground, or some- 

 times on much-decayed stumps. It is edible and considered very good. 



Hydnum septentrionale. 



In this species the caps are shelving, imbricated, and arranged in horizontal layers, 

 smaller at the top and bottom and larger in the center. The surface is irregular, some- 

 what rugose, azonate, and white to brownish. The spines are crowded, terete to sub- 

 angular, one-half to three-fourths inch long. This species occurs on various deciduous 

 trees (Fagus, Acer, Ulmus, Nyssa), often attaining considerable size. The edges of 

 the young plant are said to be edible, but they have little flavor. (PI. XXXIII, fig. 2.) 



IRPEX. 



The genus Irpex has no species of great interest to the mycophagist, 

 but several common forms are apt to attract the attention of the 

 amateur collector. Irpex may be distinguished from the preceding 

 genus by the teeth being connected at the base and being less awl 

 shaped than in Hydnum. 



Irpex fusco-violaceus. 



The plants of this species are grayish, effuso-reflexed, thin, and coriaceous; teeth 

 in irregular rows, platelike, incised at the apex,violet brown. The technical descrip- 

 tion of this fungus mentions the silky character of the cap, but most specimens appear 

 tomentose or tomentose-villose. Irpex fusco-violaceus is very common on decaying 

 coniferous trees. 



TREMELLACE^E (jelly fungi). 



Members of the family Tremellacese are typically gelatinous or 

 sometimes waxy, horny when dry, reviving when wet. The plants 

 are irregular in form, almost amorphous, usually stemless, globose 

 or brainlike. The hymenium is smooth; that is, does not develop 

 into gills, tubes, or teeth, except in one genus, Tremellodon. Most of 

 the forms are found on wood; some are edible but not especially good. 



Key to Tremellacese. 



Fruiting body membranaceous, rigid and cartilaginous when dry, 

 reviving when moist, hymenium gelatinous, ear shaped, attached 

 to a narrow base Hieneola. 



