Pound and Clements: north American hyphomycetes. 647 



placed as a sort of appendix after the perfectly known species 

 in the same manner in which Aecidium follows Puccinia. 



The following scheme will show the groups we propose and 

 their relationship: 



SPOKODESMIACBAE. 



toruleae. 

 Chalareae. 



Ramularieae. 

 Helminthosporieae. 

 dlplosporieae. helicosporieae. 



Sporodesmieae. 



Myxotrichelleae. 

 MUCEDINACEAE. 



TRICnOTIIECIEAE. 



Arthrobotryteae. 



Trichodermeae. 



BOTRYTEAE. VeRTICILLIEAE. 



Periconieae. Polyactideae. Dematieae. 



Stachybotryteae. 

 Cephalosporieae. 



STILBACEAE. 



Stilbeae. 



coremieae. isarieae. 



TUBERCULARIACEAE. 



TUBERCULARIEAE. 

 VOLUTELLEAE. FUSARIEAE. CYLINDROCOLLEAE. 



Order HYPHOMYCETEAE. 



Family SPORODESMIACEAE (Fr.) 



Sporodesmiacei Fr. Syst. Myc. 3:489. 1829. 

 Sporophores free, short and scarcely distinct from the con- 

 idia, or if distinct, simple or subsimple, and rigid. 



Tribe Toruleae (Fr.; 



Torulei Fr. Sunim. Veg. Scand. 2:504. 1849. 



Mycelium wanting or but slightly developed, sporophore 

 either entirely wanting or breaking up into chains of conidia, 

 conidia catenulate, not enclosed in a sheath. 



Torula and Alysidium are quite closely related, perhaps the 

 most substantial difference being in the color. But from this 

 point the group falls readily into two series, the one composed 

 of rigid, coarse, dark- colored forms, the other of more delicate, 



