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- 

 . theridium (see fig. 2<i). 



maseog 



2. SUBCLASS 

 PBOTOASCOMYCETES. 

 442. The a sci are well 

 Fig. 251. defined and usually with 



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

 ascogonium and antheridiuni; B, fertilized ascogonium. , , , 



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



(After Lagerheim.) ally 8> sometimes 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.) 



