662 MINNESOTA BOTANICAL STUDIES. 



Stigmina obclavata (Cke.) 



Sporidesmium obclavatum Cke. Grev. 6:137. 1878. 

 Clasterosporium obclavatum Sacc. Syl. Fung. 4:386. 188(5. 



Stigmina popdli (E. & E.) 



Clasterosporium populi E. & E. Journ, Myc. 7: 134. 1892. 



Stigmina stictica (B.&C.) 



Sporidesmium sticticum B. <fe C. Grev. 3:50. 1874. 

 Clasterosporium sticticum Sacc. Syl. Fung. 4: 388. 1888. 



47. SPORODESMIUM Lk Obs. Myc. 1 : 39. 1809. 



Including Stigmella Lev. Demidoff. Voy. 111. 1842. 



Vegetative hyphae obsolete; sporophore simple, 1 — 2 celled, 

 pedicel-like; conidia discrete or acervulate, muriform or clath- 

 rate-septate inappendiculate, fuliginous or fuscous, ovate to 

 oblong; saprogenous or phyllogenous. 



We have placed in Stigmina all forms which would belong 

 here but for the septation of the spores. This restores the 

 original limitation of Clasterosporium, but restricts Sporodesmium 

 to species with muriform-septate conidia, as limited by Sac- 

 cardo. 



43 species are reported from the United States. The follow- 

 ing changes are required by our arrangement, or for other 

 reasons. 



Sporodesmium bicolor (Pk.) 



Septonema bicolor Pk. Rep. N. Y.Mus. 38:— (60.) 1876. 



Sporodesmium peziza C. & E. Grev. 4:178. 1876. 

 Sporodesmium pithyophila (Cke.) 



Stigmella pithyophila Cke. Grev. 16: 71. 1888. 

 Sporodesmium versisporum Pound & Clements. 



Sporodesmium toruloides E. & E. Proc. Roch. Acad. Sci. 1: 51. 1890, not Fries, 

 nor Cooke. 



48. CONIOTHECIUM Corda. Ic Fung. 1 : 2. 1837. 

 Vegetative hyphae and sporophores obsolete; conidia acer- 

 vulate, inappendiculate, fuscous, muriform-sarcinate, cruciate, 

 or radiate, irregularly globose or oblong; saprogenous or phyl- 

 logenous. 



4 species are reported from the United States. We make 

 one change: 



CONIOTHECIUM SARCOSPORIOIDES (ELL. & ANDER.) 



Sporodesmium sarcosporioides Ell. & Ander. Bot. Gaz. 16: 47. PI. 10 f. 8-10. 1891. 



Myxotrichum Kze. is one of the Gymnoasceae and should not 

 be kept with the Imperfect Fungi. For those forms which are 

 properly Imperfect Fungi Saccardo has proposed the name 

 Myxotrichella. Myxotric.hella is somewhat anomalous, and would 

 have to be placed in a tribe by itself, which might be called 

 Myxotrichelleae. 



