CALIFORNIA ACADEMY OF SCIENCES. 41 



Erysiphe (Erysiphella) trina. 



Epiphyllous, mycelium covering orbicular spots, pruinose, 

 fugacious : perithecia clustered, minute, yellowish brown, m 56 

 — 70 : appendages none : asci 3, nearly globular, p- 32 — 38 : 

 sporidia 2, oblong-elliptic, or somewhat boat-shaped, very 

 large, completely filling the ascus. /< 28 — 32 18 — 20. 

 On living leaves of Quercus agrifolia. Berkeley, Jan. 



3012. 

 THECLOSPORA, nov. gen. 



Spores surrounded by a cleft, hyaline border, borne 

 on slender branching lryphae, compacted into a globular 

 woolly mass. 

 Theclospora bifida. 



Heaps scattered, globular, 1 — 2 mm. in diameter, loosely 

 attached to the surface, white, becoming yellow : lrypha aris- 

 ing from irregular, yellowish, elongated masses, rough, slen- 

 der, bearing at intervals granular spores, surrounded by a 

 broad and firm hyaline or yellowish border, marked with 

 concentric striae, and cleft on opposite sides, the hypha 

 apparently passing through. ^ 24 — 40. 



On rotting leaves of Eucalyptus globulus. San Francisco, 

 Dec. 3612. 



The place of this fungus in classification is very uncer- 

 tain, and it is only placed here because of its connection 

 with the next. 



CLEISTOSOMA, nov. gen. 



Perithecia orbicular, membranaceous. Asci borne on 

 branching threads, globose, evanescent, Sporidia hemis- 

 pherical, echinulate. 



Cleistosoma purpureum. 



Perithecia purple black, very delicate, soon dehiscent, 

 developed . within the heaps of Cleistosoma purpureum, 

 which it stains purple; asci globular, hyaline, 8-spored, 

 yu 9 — 12 : sporidia purple, hemispherical, long-echinulate 

 round the disk margin, /u 3 — 4. 3606. 



