16 PUNGUS-FLOEA. 



springing from the general surface of the peridium ; in the 

 last character agreeing with Melanogaster, from which the 

 present genus is distinct hy the minute subequal cavities of 

 the gleba. 



Rhizopogon rubescens. Tul. (fig. 3, p. 11.) 

 Irregularly ovate or globose, with long, slender, root-like 

 mycelium, white, becoming reddish when exposed, yellowish- 

 olive when mature, cavities small, numerous ; spores el^intic- 

 oblong, very pale, 11 X 4^5 /a. 



Mhieopogon rubescens, Tul., Fung. Hypog. 89, t. xi. f. 4, t. ii. 

 f. 1.; Berk., Outl. 294; Cke., Hdbk., n. 1052; Mass., Mon. 

 Gast., p. 39, f. 7. 



Amongst sand in fir-woods. Gregarious, f— IJ^ in., smell 

 sour when young, foetid when old. 



Rhizopogon luteolus. Tul. 



Globose or elongated, white, then brownish-olive, peridium 

 thick, with numerous strands of mycelium ; cavities minute, 

 rounded ; spores narrowly elliptical, pale olive, 8 X 3 yu,. 



BMzopogon luteolus, Tul., Pung. Hypog. 87, t. i., f. 5 and t. 

 xi. f. 5 ; Mass., Mon. Gast., p. 40, f. 9. 



Underground or partly exposed. Solitary or gregarious, 

 ^-1^ in., smell slight when immature, then strong. 



HYMENOGASTER, Tul. (fig. 5, p. 11.) 



Peridium fleshy or thin, continuous with the sterile base ; 

 cavities of gleba empty at first, irregularly scattered or 

 radiating from the base, tramal walls not byssoid; spores 

 elliptical or fusiform, rough or smooth. 



Hymenogaster, Tul., Fung. Hypog., p. 63 ; Mass., Mon. Gast., 

 p. 41. 



Characterised by the large elliptical or fusiform spores, 

 sterile basal stratum, and cavities of the gleba being empty 

 at first. 



Hymenogaster Klotzschii. Tul. 

 Obovate or subglobose, base fibrillose, dirty white, be- 

 coming reddish-ochre inside ; spores elliptical, minutely 

 warted, pale brown, 18-20 x 11-13 /u. 



