MICROSTROMA OOSPORA. 277 



. The present species appears to have been confounded with 

 Fusidium griseum, Link so hopelessly that it is impossible 

 to give synonyms. 



Forming very delicate whitish, filmy patches on the tinder 

 surface of the leaves. 



Tribe 2. Oosporeae. Sacc. 

 OOSPOKA. Wallr. (emend. Sacc.) (fig. 1, p. 274.) 



Tufts effused or pulvinate, lax or rather compact ; fertile 

 hypha short, slender, simple or sparingly branched ; conidia 

 regularly concatenate, globose or elliptical, bright-coloured 

 or colourless. 



Oospora, Wallr., PI. Crypt., p. 182; Sacc., Syll., iv. p. 11. 



Characterised by the globose or broadly elliptical, bright- 

 coloured or colourless conidia being arranged in a con- 

 catenate or moniliform manner. Analogous with the genus 

 Torula in the Dematieae. 



* Conidia colourless. 



Oospora fasciculata. Sacc. & Vogl. 



Tufts at first distinct, becoming confluent, white, then 

 greyish, fertile hyphae branched, ascending ; conidia con- 

 catenate, broadly elliptical. 



Oospora fasciculata, Sacc., Syll., iv. 23. 



Oidium fasciculatum, Berk., Eng. PI., p. 349 ; Cke., Hdbk., 

 n. 1813. 



On decaying oranges. Bare. 



Oospora epilobii. Sacc. & Vogl. 



Tufts white, effused, conidia broadly elliptical or globose, 

 forming long concatenate chains, colourless, 4 p or 4 x o ft- 



Oospora epilobii, Sacc., Syll., iv. 24. 



Torula epilobii, Cda., Ic. Fung., iv. p. 23, ser. vi. f. 75. 



On living stems and leaves of various species of Epilobium. 

 Kare. 



Forming very delicate bloom-like patches. 



Oospora lactis. Sacc. 

 Tufts snow-white, velvety, raembranaceous, sterile hyphae 



