132] 



The Classification of Lower Organisms 



Fig. 25. — Ascomycetes: a-e, Dipodascus albidus after Juel (1902), x 1,000; 

 a, gametes; b, syngamy; c, development of ascus; d, e, lower and upper parts of a 

 mature ascus. f, Erysiphe graminis, haustorium penetrating an epidermal cell of 

 a grass and conidiophore bearing a chain of conidia x 500. g-k, Cleistothecia of 

 Perisporiacea x 100: g, of Erysiphe sp.; h, of Microsphaera sp.; i, of Podosphaera sp.; 

 j, of Uncinula sp.; k, of Phyllactinia sp. 



