614 FUNGI IMPERFECTi: THE IMPERFECT FUNGI 



Conidiophores more or less richly branched, rarely simple. 



Conidia arising from especially differentiated intercalary cells of conidiophore. 

 Conidia produced singly. 



Fertile cells of the conidiophore as well as the intervening sterile cells 



cylindrical. Gonatobotrys 



Fertile cells spherical, intervening cells bone-shaped. 



N eviatogonimn 

 Conidia produced in chains on the globose intercalary or terminal fertile cells. 



Gonatorrhodiella 

 Conidia not arising from especially differentiated intercalary cells. 



Branching of the conidiophore very various but never purely verticillate. 

 Conidia typically pleurogenous on the conidiophore, never terminal. 

 Conidiophore forked two to several times. Haplaria 

 Conidiophores unbranched; conidia globose or ellipsoid. 



Acladium 

 Conidia pleurogenous and acrogenous. 

 Conidiophores typically unbranched. 



Parasitic within leaf tissues, clusters of conidiophores emerging from 

 the stomata, bearing at their tips several (usually 6) conidia. 



Microstroma 

 Mycelium creeping, producing numerous upright unbranched conidio- 

 phores each with a single hyaline or brightly colored conidium. 



Acremonium 

 Conidiophores with short teeth along the enlarged or not enlarged 

 upper end; conidia single or in chains from these teeth, large in 

 proportion to the diameter of the conidiophore, globose to 

 elhpsoid. Mainly saprophytic (including Olpitrichuin and 

 Physospora). Oidium 



(syn., Rhinotr'ichum) 

 Resembling the foregoing but parasitic on leaves; conidia hyaline, 

 globose or oval, single, rarely in short chains. 



Ovularia 

 Conidiophores almost always branched. 



Mycehum creeping, conidiophores not upright. 



Sporotrichum 

 Conidiophores always upright. 



Conidia single at the tips of the branches. 



Conidiophores dendroidally branched; conidia single at the tips 

 of the branches, hyaline or bright-colored, oval or globose. 



Mo7iosporiuni 

 Conidia clustered near the ends of the usually branched conidio- 

 phores. 

 Branches of the conidiophores slender, almost uniform. Conidia 



forming loose groups at the tips. Botrytis 

 Mostly thickei' than the foregoing; the conidia on small sterig- 

 mata; sclerotium formation frequent. 



Polyactis^'' 

 The tips of the rather slender branches somewhat enlarged and 

 bearing the conidia on distinct sterigmata. 



Phymatotrichum ^ ^ 



" Frequently included in Botrytis. 



