486 HYMENOGASTRACE.E Sphcerobolus 



2098. S. terrestris W. G. Sm., Thelebolus terrcstris A. & S. — not 



of Tode — (from the frequent habitat, the earth j terrestris, 



pertaining to the earth) a b c. 



Pe. at first hemispherical, saffron-yellow honey-colour or sienna, 



seated on a dense tomentose Sub. of buff-white here and there 



brownish Myc. Peri, spherical, colour as Pe. 



Crowded in troops. Earth, leaves, pine, moss, rotten wood, oak. Mar.- 

 Nov. Diam. ^ in. 



Fam. XL HYMENOGASTRACEiE 



Subterranean. Peridium indehiscent. Capillitium absent. 

 Spores 2-7. Species 2099—2122 



Key to the Genera. 



Spores globose war ted. 



Sterile base of peridium well developed 123 Octaviania. 



Sterile base of peridium absent 125 Hydnangium. 



Spores smooth. 



Sterile base of peridium absent. Spores elliptical ... 124 Melanogaster. 

 Gleba cartilagineo - glutinous. Spores minute, 



elliptical 126 Hysterangium. 



Peridium with root-like fibres on the surface 127 Rhizopogon. 



Spores large, elliptical or fusiform, rugulose or nodulose. 



Sterile base of peridium well developed 128 Hymenogaster. 



CXXIII. OCTAVIANIA Vitt. 

 (After Dr. Vincent Ottaviani.) 



Peridium continuous or cracked, cottony, running down into a 

 well developed sterile base. Trama byssoid, easily divisible, cells 

 at first empty, peripheral cells small, spherical, central cells much 

 larger and irregular. Spores 2-7, globose, warted. (Fig. 140.) 



Distinguished from Hydnangium by the presence of a sterile 

 basal stratum and from Melanogaster in the cavities of the gleba 

 being at first empty and the trama byssoid. Species 2099 — 2101 



2099. 0. asterosperma Vitt. (from the star-shaped spores ; Gr. aster, 

 a star, sperma, a seed) a b c. 

 Globose, regular or irregular. Pe. continuous or cracked into 

 areolae, minutely downy, at first whitish-buff, then rosy-salmon, 

 clouded umber. 67. salmon, slightly buff, cells umber. 



Generally near the surface, often partially exposed. Odour sweet, of Ocymum 

 basilicum, sometimes of new cheese or pungent. Adhering to buried 



