f 



283 



Perithecia minute, crowded, ovoid or spherical, with a conical apex. Emer- 

 gent, pallid, the free portion becoming brown or nearly black ; '38 mm. high by 

 •3 mm. wide. 



Asci cylindrical, 16 mm. long by "OO? to "008 mm. wide. 



Sporidia eight, uniseriate, elongato-elliptic, acute, straight, mucronate at 

 either end, greenish or yellowish, hyaline, simple, '628 to '03 mm. long by '005 

 to "006 mm. wide. 



Hypomyces viridis. Berk, and Broome Ann. N. H., No. 1101. 



,, „ Karsten. Myc. Fenn. n., p. 211. 



,, ,, Saccardo Mich, i., p. 286. 



„ „ Phillips and Plow. Grev. vin., p. 104, t. 130, f. 1 (a-cj. 



Sphaeria viridis. Alb. and Schw. Consp. , p. 8, t. 6, f . 8. 



,, luteo-virens. Fries Sys. Myc. 11., p. 339. 



On various Agarics, especially Lactarii. Ray's Plantation, South Woot- 

 ton, 1878-9-80, C. B. P. 



This is a very marked species, which I have had one opportunity of watch- 

 ing through various stages of its development. It attacks the fungus (usually as 

 Lactarius) before it appears above ground. In this early state the agaric looks as 

 if it had been dipped in the yoke of an egg. So completely were my specimens 

 infected, that it was impossible to identify the host beyond being an agaric. In 

 a short time the yellow colour darkens and becomes a dirty cinerous green, more 

 or less dark in tint. The affected agaric usually increases pari passu with the 

 Hypomyces, and does not tend to putrifaction to any abnormal degree. 



Plate 7, Fig. 2. a Portion of Lactarius with the Hypomyces. Nat. size. 

 i Perithecia, enlarged. 

 c Perithecium X 140. 

 d Sterile threads of conidia Xt40o. 

 e Asci and sporidia X 400. 

 y Sporidia X 800. 



10. Hjrpomyces terrestris. Plow. <£• Baud. Conidia parasitic upon 



Agarics, consisting of branched hyaline septate tubes, bearing at their extremities 



oval or pyriform conidia, which are filled with transparent, granular endochrome ; 



'025 to '03 mm. long by "01 mm. wide. 



Stroma at first a mere web of white arachnoid threads, spreading over the 

 ground, which gradually becomes thicker and consolidates into Corticium-like 

 patches of from 1 to 2 cm. in diameter, of a pale flesh-colour. 



Perithecia sub-globose, at first inmiersed in the stroma, then nearly half 

 free, reddish in colour ; "3 mm. in diameter. Ostiola conoid red. 



Asci cylindrical ; '15 to '2 nun. long by "OlS mm. wide. 



Sporidia eight, fusiform, acute, sometimes appendiculated, hyaline, unise- 

 riate ; '03 to "04 mm. long by "008 to '01 mm. wide. 



Hypomyces terristris. Plow and Boud. Grevillea viii., p. 10.5, pi. 130, f. 2. 



On the ground, beneath or in close proximity to the place in which the 

 conidiiferous agaric has decayed. 



