618 FUNGI IMPERFECTi: THE IMPERFECT FUNGI 



Key to the More Important Anierosporous Genera of Family Dematiaceae 



Conidia sessile or very short-stalked, vegetative mycelium not extensive. 

 Conidia round, oval, or discoid. Coniosporium 



Conidia elongated, almost fusiform. Fusella 



Whole mycelium or the more or less elongated branches developing into chains of 

 dark-colored conidia. ^^ 

 Conidia falling apart easily; spherical or elongate. Torula 

 Conidia remaining attached and separating with difficulty. 



Horniiscium 

 Clusters of spreading ovoid or limoniform conidia at the tips of the short conidio- 



phores. Echinohotrtjum 



Conidiophores well developed; vegetative hyphae abundant. 



Conidia dark-colored (except some species of Acrotheca and Trichosporium) . 

 Conidia not in chains. 



Conidia terminal in heads. 



Conidia curved or unsymmetrical on unbranched conidiophores which 

 are hyaline but with black rings at each septum ; conidia dark. 



Camptoum 

 Conidia spherical or ovoid, dark. 



With sterigmata. ' Stachybotrys 



Practically sessile. Periconia 



Conidia fusiform, dark to hyaline, practically sessile. 



Acrotheca 

 Conidia lateral, mostly in whorls. 

 Conidia smooth, not angular. 



Conidiophores dark, unbranched or dichotomously branched. 



Gonatobotryum 

 Conidiophores hyahne, with thick dark septa, mostly unbranched. 



Arthrinium 

 Conidia angular, opposite or in whorls. Goniosporium 



Conidia terminal on branched or inflated conidiophores. 



Conidiophores distinct from the mycelium, simple or forked, straight. 



Virgaria 

 Conidiophores arising on short lateral upright twigs from the creeping 

 mycelium. 

 Conidia sessile. Trichosporium 



Conidia on sterigmata. Rhinocladium 



Conidiophores branched, the branches curved or hooked; conidia crowded 

 near the ends of the twigs, colored or almost liyaline. 



Canipsotrichum 

 Conidia terminal and sometimes also lateral on unbranched conidiophores 



fin the sense of Saccardo). Monotoxpora 



Conidiophores short, unbranched, in a crowded clustei' with a single dark 

 conidium at the apex, narrowed at point of attachment. 



Hadrotrichum 

 Conidio])hores unbranclied or branched, the black conidium sessile on the 

 vesicle-like enlargement at the apex of the conidiophoric branch. 



Nigrospora 



19 Forms with bent or somewliat spirally wound rows of spores should be sought in 

 the Helicosporae under the genus Helicoceras {Gyroceras). 



