MISCEIiLANEOUS FUNGI IMPERFECTI 857 



in Canada. The lesions were dark macular, pustular and ulcerating, with scaly 

 centers on forearm; they tended to heal spontaneously only to reappear over 

 a period of 16 years. 



Macroconidia 4-8-celled with only transverse septa, or fusiform with both 

 longitudinal and transverse septa, varying from "the size of a single leucocyte 

 to that of 8-10." 



Optimum temperature 25° C, aerobic or aquatic aerobic. On Sabouraud 

 agar, colony white, becoming brownish black in 3 weeks after conidia are 

 produced. In subcultures conidia are produced much sooner, often in 5 days. 

 On serum glucose agar, pellicle formed at surface. On beef broth a pellicle 

 was produced. 



In the foregoing description there is little to prove identity with Alternaria 

 tenuis Nees. The lesions suggest those produced by Hormodendron or Spondy- 

 locladium. It is hoped that Borsook will follow his account by a more com- 

 plete description of the organism and appropriate figures. 



STILBACEAE 



Vegetative hyphae in or upon the substrate, septate, branched, hyaline 

 or dark colored. Fertile hyphae in parallel strands forming coremia which 

 bear conidia at their tips. The ends of the coremia often form differentiated 

 heads on which the conidia are borne ; in other forms the conidia are borne 

 along the stalk as well. The stalk may be either simple or branched. 



The group is artificial, as coremia are formed by various groups of fungi, 

 especially in old cultures and are often overlooked. In this case the organism 

 would be placed among groups on the basis of its conidia without reference 

 to coremia. In this work, organisms have been classified without reference 

 to coremial production, but below a key to genera of Stilbaceae has been 

 provided, together with indications of the position of various organisms treated 

 previous were they to be treated in this family. Stysanus, bearing a brown 

 coremium, often appears in cultures as a contaminant. 



Key to Genera 



Conidia, coremia, and hyphae hyaline or bright colored. HYALOSTILBOIDEAE. 



Conidia unicellular, hyaline, or bright colored. 



Conidia in chains. Coremimn. 



Conidia not in chains. 



Conidia bacilliforni. Clavularia. 



Heads not differentiated, conidia borne over whole surface. 



Isaria. 

 Heads differentiated partially, conidia only on the top. 



Cilicio'podium. 

 Heads differentiated. 



Each stalk bearing a single terminal head. 



Conidiophores simple. Stilbclla. 



Conidiophores branched. Dendrostilbella, 



