KEYS TO THE MORE IMPORTANT GENERA OF FUNGI IMPERFECTI 619 



Conidia formed in chains, mostly colored. 



Conidiophore branched at the summit in a manner resembling Penicillium. 



Haplographmyn 

 Conidiophore bearing a few lateral branches with chains of conidia. 



Dernatium 

 Conidiophore dendroidally much branched, the ends of the branches 

 bearing acrogenously produced chains of conidia, resembling some 

 species of Cladosporium but conidia not septate. 



Hormodendron 

 Conidiophore nodulose, with clusters of phialides at the nodes. 



Gonatorrhodium 

 Conidia hyahne or almost so; conidiophores dark, or hyaline and then dark 

 sterile hyphae present. 

 Conidiophores unbranched, straight, usually hyaline, upright, close together, 

 among tall usually dark sterile hyphae, sometimes growing from the 

 foot of such hyphae. 

 Conidia ellipsoid or allantoid. 



Sterile hyphae wavy, unbranched. Sarcopodiwn 



Sterile hyphae circinate, imbranched. Helicotrichum, 



Sterile hyphae repeatedly forked, with circinately curved branches. 



Circiiiotrichum 

 Conidia fusiform, curved. EUisiella 



Conidiophores bearing the conidia on lateral branches or sessile on the sides. 

 Conidiophores unbranched, conidia sessile near the upper end. 



Chloridium 

 Conidia arising on lateral branches from the middle portion of the conidio- 

 phore, cylindrical. Chaetopsis 

 Fertile branches of the conidiophore not confined to the middle portion. 

 Branches verticillately borne; conidia globose or ovoid. 



Verticicladium 

 Branches irregular, conidia fusiform. Menispora 



Conidiophores branched, bearing clusters of numerous sterigmata at the 



joints. Gonytrichum 



Conidia arising on (two to three) phialides on the convex side of a dark, 

 curved, pyriform "falx," which may arise directly from a brown 

 "foot cell" in the hyaline mycelium or on a short or elongated, or 

 even branched conidiophore (or "falciphore"); conidia hyaline, 

 spherical. Zygosporium 



Conidia arising in heads of slime at tips of whorled branches of the upright, 

 dark conidiophore. Stachylidium 



Key to the More Im,porlant Didymosporous Genera of Family Dematiaceae 



Conidiophores very short or scarcely different in appearance from the dark- 

 colored conidia. 

 Conidia not in chains; conidiophores very short. Dicoccum, 

 Conidia in chains; conidiophores short. Bispora 



Conidiophores distinctly different from the mycelium, mostl}^ erect. 

 Conidia not in chains. 



Conidia exclusively apical on conidiophores. 

 Conidiophores not twisted or swollen. 



Conidiophores quite long, with several septa. 



Passalora 



