THE FUNGI WHICH CAUSE PLANT DISEASE 321 



Foreign species are on Papaver, Ranunculus, Delphinium, Calen- 

 dula, Thalictrum and several other hosts. 



E. betiphilum Bub. is described on beet seed capsules; ^° 



E. lephroideum for the same host in France; 



E. calendulae (Oud.) de B. on Calendula. 



E. crastophilum Sacc.^ 



Sori in leaves, subcircular to linear, about 0.25-2 mm. in length, 

 usually distinct though occasionally merged, black, long covered 

 by the epidermis; spores dark-brown, tightly packed and adhering 



Fig. 237. — E. ellisii, chlamydospores germinating within 

 the leaf ti3sue, sporidia superficial. After Halated. 



more or less, chiefly ovoid to spherical or angled through pressure, 

 rather thick-walled, 8-14 n in length. 



On Poa, Phleum, Agrostis and other grasses in Europe and 

 America. 



E. irregulare Joh. occurs on species of Poa in Europe and 

 America; 



E. polysporum (Pk.) Farl. on various hosts including the com- 

 mon sunflower. 



E. eUisii Hals." 



Sori in leaves, forming pale white spots, indefinitely limited, 

 subconfluent; spores hyaline or slightly yellowish, clustered in the 

 intercellular spaces beneath the stomata, spherical, thick-walled, 

 (2-5 Ai) chiefly 16-20 n but varying from 11 to 25 m in diameter; 

 conidia hypophyllous, abundant, acicular, small, 10-14 ix by less 

 than 1 fi. 



On spinach. New Jersey.'^' '^^ 



The chlamydospores germinate in situ beneath the stomata 

 and bear the sporidia on tufts of promycelia which emerge through 

 the stomata, presenting much the appearance of a Hyphomycete. 



