KEYS TO THE MORE IMPORTANT GENERA OF FUNGI IMPERFECTI 605 



Pycnidia without ostiole or with irregular opening. 

 Conidia oblong, pointed at each end. 



Sclerotiopsis 

 Conidia oblong, ends rounded. Plenodomus 

 Pycnidia with long beak. Sphaeronetna^ 



Pycnidia in a radiating subiculum. Asterovia 



Conidia with several early disappearing apical appendages. 



Neottiospora 

 Conidia produced in chains. Sirococcus 



Pycnidia with appendages or hairs. 

 Appendages unbranched. 



Bristles all over the pycnidium; spores ellipsoid, curved. 



Verinicularia 

 Bristles mostly around the ostiole; spores straight. 



Pyrenochaeta 

 Appendages stellate or stellately branched at the tip. 



Staurochaeta 

 Pycnidia (rarely) single or several in a stroma or frequently represented only 



by pycnidial cavities in the stroma. 

 Pycnidium mostly single, often without definite, distinct stroma. Conidia 



of two types, oval on long conidiophores and long 

 slender stylospores, usually curved like a hook at one 

 end, on short conidiophores. 



Phomopsis 

 Pycnidial cavities several in a stroma, with separate ostioles. 

 Conidia large, more or less fusiform, straight. 



Fusicoccum 

 Conidia cylindrical or ovoid, straight. Dothiorella 



Conidia small, allantoid. Cytospora 



Pycnidial cavities often with a common ostiole, conidia straight. 



Ceuthospora 

 Conidia colored. Phaeosporae 



No stroma, rarely with a subiculum. 

 Pycnidia glabrous, with regular ostiole. 



Conidia oval or elongated, strikingly large. Sphaeropsis 

 Conidia spherical or ellipsoidal, very small. 



Coniothyrium 

 Pycnidia glabrous, with pronounced beak. Naemosphaeria 

 Pycnidia glabrous, with lobed, irregular mouth. 



Harknessia 

 Pycnidia with external hairs or bristles. Chaetomella 



Stroma present; pycnidia superficial or at first in the stroma. 



Haplosporella 

 Conidia two-ceUed. Didymosporae 



Conidia hyaline, pale greenish in some species. Hyalodidymae 

 Pycnidia free, without subiculum or stroma. 

 Pycnidia glabrous. 



Pycnidia without beak. 



Pycnidia in definite spots on leaves or stems. 



Spores without appendages. Ascochyta 



^ Species of Ophiostoma with dissolved asci may be confused with this. 



