24 



GENERA OF FUNGI 



b. Mycelium short, tubular, mostly or entirely 



developing into sex-cells 

 Typically aerial fungi propagating by conidia 



a. Conidia typically in globose to cylindric spo- 



rangia or sporocarps 



(1) Conidia endogenous, or rarely exogenous 



(a) Conidia typically in stalked sporangia, 



rarely on conidiophores 



(b) Conidia in sessile sporocarps, often with 



chlamydospores or the latter alone 

 present 



(2) Conidia exogenous on conidiophores and 



endogenous in sporangia 



b. Conidia single, rarely in chains, on the tips of 



simple or branched conidiophores 



(1) Conidiophores simple; zygosporous; large- 



ly entomogenous 



(2) Conidiophores typically ramose, or co- 



nidia in chains; oosporous; typically 

 parasites on leaves and stems 



Ancylistaceae p. 39 



Mucoraceae p. 34 



Endogonaceae p. 36 

 Ascoideaceae p. 37 



Empusaceae p. 37 

 Peronosporaceae p. 40 



ASCOMYCETES 



A. Asci completely or partly enclosed in a definite 

 pericarp which opens variously at maturity 

 1. Pericarp with a distinct wall, mostly with a 

 regular opening at maturity 

 a. Asci borne in perithecia, which are often re- 

 duced to locules in a stroma 



(1) Perithecia one to many on a receptacle; 



sex-organs present; typically on insects 



(2) Perithecia not on a receptacle; sex-organs 



regularly lacking; rarely on insects 

 (a) Ostiole and paraphyses usually lacking 

 X. Asci borne on branched hyphae, hence 

 irregularly disposed or in corymboid 

 clusters 

 y. Asci in a basal umbel or parietal layer, 

 or sometimes solitary 

 (x) Aerial mycelium typically present; 



no crumpent stroma 

 m. Aerial mycelium white; appendages 



present and usually modified 

 n. Aerial mycelium dark, sometimes 

 lacking; appendages usually absent 

 (m) Perithecia not radiate; asci basal 

 r. Hyphae not slimy, straight- 

 walled; perithecia parenchymic, 

 the cells polygonal, not slimy 

 s. Hyphae straight-walled; perithe- 

 cia dissolving in slime as they 

 mature 



Laboulbeniales p. 42 

 Perisporiales p. 49 

 Eurotiaceae p. 50 



Erysiphaceae p. 52 



Perisporiaceae p. 53 

 Englerulaceae p. 55 



