616 FUNGI IMPERFECTi: THE IMPERFECT FUNGI 



Conidia cylindric-oval, single or in short chains, growing out of the stomata 



of the host plants. Ramularia 



Conidia pyriform; single; mostly parasitic on grasses, sometimes saprophytic 

 and aquatic. Piricularia 



Conidiophores simple or shghtly branched, bearing the conidia in chains. Sapro- 

 phytic or some species parasitic on vascular plants. 



Septocylindrium 



Key to the Scolecosporous Moniliaceae 



Parasitic on vascular plants, mostly producing leaf spots. 



Only genus. Cercosporella 



Key to the More Important Staurosporous Moniliales 



Conidia hyaline, borne successively on definite hyaline phialides. 



Conidia when mature consisting of four slender, ultimately septate, widely 

 diverging arms, attached to the phialide at their point of divergence ; 

 conidiophore long and slender, with two to eight phialides near the 

 apex; aquatic. Lemonniera 



Conidia consisting of a main curved axis attached at one end to the phialide and 

 with two, nearly opposite, lateral, nonseptate branches produced at 

 the high point of the curve; conidiophores long, with one to four 

 phialides. Aquatic. Alatospora 



Conidia consisting of a clavate, main axis which may be one to three septate 

 or nonseptate, bearing at the broader, upper end three slender, non- 

 septate arms or only short divergent processes (the spore then resem- 

 bling a clove) ; conidiophore long, unbranched or branched, bearing at 

 the apex one to four phialides. Mostly aquatic; the divergent arms 

 sometimes lacking on conidia produced in the air; sporodochia some- 

 times produced. Heliscus 

 Conidia (aleuriospores or radulaspores) not borne on phialides. 

 Conidia and conidiophores hyaline. 



Aquatic saprophytes, conidia produced submersed. ^^ 



Conidia with a main cylindrical, or more often clavate to pyriform, axis at 

 or near whose upper end usually three divergent branches arise 

 successively. 

 Main axis of conidium narrowly pyriform or broadly clavate, once 

 septate; on a long slender conidiophore; the three branches from the 

 upper cell diverging at angles of about 120° and at about right angles 

 to the main axis of the spore. In cultures pycnidia sometimes formed. 



Clavariopsis 

 Main axis of conidium narrowly clavate, eventually once or twice 

 septate, giving rise to three unequal, divergent tapering branches with 

 a knob or thick finger-like process on the upper side, near the base, 

 of the first two branches produced. Tetracladium 



Main axis of the conidium and the three somewhat longer branches 

 about equal in thickness, nearly cylindrical, one to three septate at 

 maturity. Articulosjwra 



Conidia with a straight or curved, septate, main axis from which arise 

 laterally, near together or from separate cells, the strongly divergent 

 septate branches which may, in their turn, bear lateral branches. 



i» For details of these aquatic genera, see Ingold (1942, 1943, 1944). 



