216 



MORPHOLOGY. 



In the autumn and winter dead flies are often found stuck to window-panes, 

 with a white ring of the conidia around each fly. 



II. Class Ascomycetes. (The ascus series.) 



1. SUBCLASS HEMIASCOMYCETES. 



441. Order Hemiascales (Hemiascineae). Fungi with a well developed, 



septate mycelium, but 

 with a sporangium-like 

 ascus, i.e., a large and 

 indefinite number of 

 spores in the ascus. Ex- 

 a m p 1 e s : Protomyces 

 macrosporus in stems of 

 Umbelliferae, or P. poly- 

 sporus in Ambrosia tri- 

 fida. These two are by 

 some placed in the Usti- 

 lagineae. Dipodascus 

 albidus grows in the 

 exuding sap of Bromeli- 

 aceae in Brazil and the 

 sap of the beech in 

 Sweden. The ascus is 

 developed as the result 

 of the fertilization of an 

 ascogonium with an an- 



ascog 



2. SUBCLASS 

 PROTOASCOMYCETES. 

 442. The asci are well 

 2S1- defined and usually with 



Dipodascus albidus. A, thread with sexual organs, a limited and definite 

 ascogonium and antheridium ; B, fertilized ascogonium u r r 



developing ascus; C, ascus with spores; D, conidia. number of spores (usu- 

 (After Lagerheim.) ally 8> some tmies i, 2, 



4, 1 6, or more). Mycelium often well developed and septate. Asci scat- 

 tered on the mycelium, not associated in definite fields or groups. 



443. Order Protoascales (Protoascineae). The asci are separate cells, 

 or are scattered irregularly in loose wefts of mycelium. No fruit body. 

 (The yeast, Saccharomyces, see paragraph 237; and certain mold-like 

 fungi, some of which are parasitic on mushrooms, as Endomyces, are 

 examples.) 



