KEYS TO THE MORE IMPORTANT GENERA OF FUNGI IMPERFECTI 609 



Key to the More Important Genera of Family Melanconiaceae 



Conidia nonseptate, hyaline, globose to ellipsoid to cylindrical, sometimes fusoid 

 or allantoid. 

 Acervulus immersed, but early erumpent, bright-colored, somewhat gelatinous; 

 some species, at least, parasitic upon Uredinales. 



Hainesia 

 Acervulus immersed but remaining covered by the host epidermis for a con- 

 siderable time; pale or eventually dark-colored; spores surrounded by 

 slime; mostly parasitic or saprophytic on herbaceous parts of higher 

 plants, not on Uredinales. Setae wanting. Gloeosporium 

 Much like Gloeosporium but the very short conidiophores arising from a firm 

 base, almost stromatic, or even resembling a small sporodochium. Per- 

 fect stage Elsinoe. Sphaceloma 

 Similar to Gloeosporium but with pale or colored setae around or in the acervulus, 

 their presence often depending upon the substratum. 



Colletotrichmn^^ 

 Similar to Gloeosporium but growing only on branches of woody plants. 

 Conidia straight or almost so. Myxosporium 



Conidia allantoid. Naemospora 



Conidia nonseptate, globose to ovoid, etc., dark-colored. 



Conidia more or less globose; mostly saprophytic on twigs of woody plants. 



Melanconium 

 Conidia fusiform, often curved; mostly on herbaceous plants. 



Cryptomela 

 Conidia hyaline, with one transverse septum. 



Parasitic on leaves; conidia more or less oblong. Marssonina 

 Usually on twigs (rarely on leaves), conidia oblong to fusoid. 



Septomyxa 

 (Rhynchosporium, with conidia strongly beaked, and growing mostly on grasses 

 is sometimes placed in this group.) 

 Conidia colored, with one transverse septum. Mostly saprophytic on twigs. 



Didymosporium 

 Conidia hyaline, with two or more transverse septa; on leaves or twigs. 



Septogloeum, 

 Conidia colored, with two or more transverse septa. 



Conidia not beaked, emerging in a black drop or cirrhus. 



Stilhospora 

 Conidia not beaked, not emerging in a drop or cirrhus. 



Basal cell of conidium usually colorless; the elongated conidiophore persist- 

 ent on the conidium; walls of the cells thin and collapsing slightly on 

 drying. 



Coryneopsis 

 Basal cell of conidium colored; walls of the cells of conidium usually much 

 thickened; conidiophores usually shorter than the spore. 



Coryneum 

 Conidia with colorless upper cell forming a sort of beak. 



Conidia three to five septate, arcuate, only the two middle cells colored. 



Toxosporium 



1" Some species may be confused with Vermiadaria or with Volutella. 



