HYSTEKANGIUM — EHIZOPOGOX. 15 



Hydnangium carneum, Wallr., MS. ; Mass., Mon. Gast., p. 37, 

 f. 14. 



Underground or partly exposed. About | in. across. 



HYSTEEANGIUM. Vitt. (fig. 4, p. 11.) 



Peridium distinct, separable ; gleba at first mucilaginous, 

 becoming gelatinous, cavities at first empty ; spores minute, 

 smooth. 



Hystercmghim, Yitt., Mon. Tub., p. 13; Mass., Mon. Gast., 

 p. 87, f. 4. 



Known by the cartilaginous nature of the mature gleba, 

 separable peridium, and minute elliptical, smooth spores. 

 There is often an abundant development of mycelium. 



Hysterangium nephriticum. Berk. (fig. 4, p. 11.) 

 Spherico-depressed, mycelium white, strand-like ; peridium 



rather thick ; gleba tinted with grey or dirty green ; cavities 



minute, irregular, radiating from the base; spores pale, 



elliptical, 18-20 x 5-6 /x. 



Hysteranc/ium nephriticum. Berk., Outl. 294; Cke., Hdbk., 



n. 10o(» ; Mass., Mon. Gast., p. 38, f. 4. 



Amongst clay, &c. From ^ to 1 in., at first white, downy, 



springing from a dense mat of root-like mj'celium. 



Hysterangium Thwaitesii. B. & Br. 



"White, subglobose, becoming reddish when bruised ; 

 spores oblong, apiculate, ])ale olive, 25-30 X 7-9 /a. 



Hysterangium Thoaitcsii, B. and Br., Ann. Nat. Hist., 

 ser. li. V. ii. p. 267 ; Mass., Mon. Gast., p. 39, f. 80. 



On the ground, under trees. About ^ in. across. Peridium 

 thin, separating when dry. 



PtHIZOPOGON. Tul. (fig. 3, p. 11.) 



Peridium thick and persistent, or thin and disappearing, 

 with strands of mycelium traversing its surface ; cavities 

 distinct, at first empty ; sjwres smooth. 



Mltizopogon, Tub, Gioru. Bot. Ital. ii. p. 56 ; Mass., Mon. 

 Gast., p. 39. 



Agreeing with Hysterangium in the smooth ellij)tical spores, 

 but distinguished by the root-like strands of mycelium 



