738 MINNESOTA BOTANICAL STUDIES. 



24. MICROCERA Desm. Ann. Sci. Nat. Bot. III. 10:359. 



1848. 



Sporodochia conical or pulvinate; conidiophores filiform, 

 subverticellate; conidia narrowly falcate, many-septate. 



Not very well distinguished from Fusarium. One species is 

 reported from North America. 



Tribe Triinmatostromeae. 



Sporodochium pulvinate, or disciform, fuscous; sporophores 

 obsolescent or obsolete; stroma cellular when present, some- 

 times lacking; conidia catenulate, catenulae often branched, 

 acervulate, simple to phragmosporous, fuscous. 



25. STRUMELLA Fr. Summa Veg. Scand. 2:482. 1849. 

 Sporodochium irregularly verruciform; sporophore very 



short, obsolescent; chains of conidia irregularly multiramose; 

 conidia ovoid to fusoid, simple. 



Five species of this anomalous genus occur in the United 

 States. 



26. TRIMMATOSTROMA Corda. Ic. Fung. 1 : 9. 1837. 

 Sporodochium pulvinate, more or less carbonaceous; sporo- 

 phore obsolete; conidia oblong, phragmosporous. 



A single species is reported for this country. 



