612 FUNGI IMPERFBCTi: THE IMPERFECT FUNGI 



Conidia not coiled in three planes, or if so then the filaments irregularly- 

 twisted and contorted. 

 Conidia once coiled, one to three septate; fructifications gelatinous. 



Delortia 

 Conidia not one to three septate; or if so, then sporodochia not gelatinous. 

 Conidial filaments 7 ju or more in width; conidia coiled in three planes, 



twisted and contorted. Hohsonia 



Conidial filaments less than 7 /x in width; conidia not coiled in three 

 planes. 

 Conidiophores slender, even; fructifications horny when dry. 



Everhartia 

 Conidiophores moniliform; fructifications not as above. 



Troposporella 



Key to the More Important Amerosporous Genera of Family Moniliaceae 



(Based chiefly on Lindau, in Engler and Prantl, 1899-1900) 



No conspicuous conidiophores, the globose conidia forming a pulverulent layer 

 on the surface of the scanty mycelium; saprophytes. 



Chromosporiwn 

 Conidia produced in chains by the basipetally progressing segmentation of the 

 vegetative hyphae or conidiophores. 

 Mycelium very slender (< 2 n), mostly nonseptate, producing aerial, more 

 often coiled conidiophores breaking up into chains of cylin- 

 drical or ellipsoidal conidia. Sometimes still included in the 

 genus Actinomyces. Soil organisms, parasitic or saprophytic on 

 plant material. Streptomyces 



Mycelium larger than the foregoing, septate. 

 Conidia ovoid or globose. 



Mycelium forming spreading or cushion-like masses on the substratum. 

 On plant or animal debris, occasionally parasitic. 



Oospora 

 Mycelium extensive in the substratum, producing tufts of external hyphae 

 which break up into chains of moderately large to large conidia. 

 Parasitic or saprophytic on plant material. Some species are 

 the imperfect stage of Sclerotiniaceae. 



Monilia 

 Mycelium mostly external, with haustoria penetrating the epidermal cells 

 of the host, and forming upright chains of basigenous conidia. 

 Asexual stage of various Erysiphaceae. 



Oidium^* 

 Conidia fusiform. Fusidium 



Conidiophores simple or only slightly branched; conidia not catenulate, grouped 

 in heads. 

 Conidiophores mostly stout, swollen at the top into a distinct sphere or disk, 

 with radiating globose or fusiform conidia. Some, perhaps all, 

 of the genera falling into'this category really belong to the 

 Mucorales. 



^* Commonly, but erroneously so called (see Linder, 1942). 



