273 



than the agaric which harbours Hypomyces luteo-virens), yet I have no doubt as to 

 the parasitic nature of this plant. 



The younger specimens are whitish in colour, and only assume their 

 alutaceous hue when the perithecia are developed. M. Tulasne (Sel. Fung. Carp., 

 m., t. IV., f. 4) gives a figure of the conidia, which are globose hyaline bodies, 

 bom upon verticillate septate threads. 



ffypocrea inclusa, B. & Br., is a species remarkable, both on account of its 

 curious habitat as well as for its fructification ; it is virtually an eight-spored 

 Hypocrea, growing internally upon the hymenium of Tuber puberulum. 



The following seventeen species of ffypomyces naturally fall into two 

 groups, viz., those of which the ascigerous fructification is known, and those of 

 which it is unknown. The former may further be divided into (A) those having 

 larger acute sporidia, and (B) those with smaller obtuse sporidia. 



AscospoKEs Known. 

 A. — Sporidia acute. 



1 Hypomyces chrysospermus, Tul. 



1. Hypomyces chrysospermus, Tul. Conidia, small, white, 

 ovate or oblong, obtuse at both ends, sometimes contracted in the middle ; "01 to 

 •02 nun. long by '005 to 'OOe mm. wide. 



Chlamydospores. Spherical, rough with warts, golden yellow, becoming 

 yellow brown, very abundant ; '013 to '02 mm. in diameter. 



Perithecia. Numerous, crowded, upon and amongst the golden powder of 

 the chlamydospores, ovoid, with a conico-attenuated apex ; at first hyaline, then 

 golden yellow, smooth ; "3 to "32 mm. in height. 



