620 FUNGI IMPERFECTi: THE IMPERFECT FUNGI 



Conidiophores short, with only one or two septa. 



Fusicladium 

 Conidiophores regularly twisted or swollen. Polythrincium 

 Conidiophores short, mostly clustered; conidia terminal and lateral, conidio- 



phore not branched. Scolecolrichum 



Conidiophores longer, branched. Cladosporium 



(some species) 

 Conidia in mostly acrogenously developed chains. 

 Conidiophores showing no swelling. 



Conidia in short, branched clusters, at first nonseptate but mostly some of 

 the older conidia once septate (or even twice septate). 



Cladosporium 

 Conidial chains clustered nearer the apex of the long upright conidiophore; 

 conidia once septate. Diplococcimn 



Conidiophores branched, .septate, the individual cells swollen above; conidia 

 in acrogenously produced chains, early becoming once septate. 



Cladotrichum 



Key to the More Important Phragmosporous Genera of Family Dematiaceae 



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

 colored conidia. 

 Conidia single, not in chains. 



Conidia not drawn out into a long tail. 



Conidiophores here and there on the creeping mycelium. 



Clasterosp orium 

 Conidiophores standing close together. Stigmina 



Conidia drawn out into a long, pale, often curved tail. 



Ceratophorum 

 Conidia produced in chains. Septonema 



Conidiophores well developed. 



Conidia not in chains, nor in whorls, nor clustered in a head. 

 Conidia smooth. 

 Conidiophores firm. 



Conidia elongate. Helniinthosporium'^'^ 



Conidia ovoid. Brachysporium-^ 



Conidiophores weak. N apidadium'^'^ 



Conidia rough. Heterosporium 



Conidia formed in whorls, laterally, on the conidiophores. 



Spon dylocladium 

 Conidia clustered in a head at the apex of the unbranched conidiophore. 



Acrothecium 

 Conidia in chains at the tips of the much-branched conidiophore.'^^ 



Dendryphium 



Key to the More Important Dictyosporous Genera of Family Dematiaceae 



Conidiophores very short or lacking; conidia mostly sitting directly on the 

 mycelium. 



2° These three genera grade into one another and have no sharp distinguishing 

 characters. 



21 In some species the spore chains are short or lacking. 



