ASCOMYCETES 



207 



shown in Fig, 80, b. The asci are club-shaped and bear eight 

 hyaline ovoidal spores. The paraphyses are simple or branched, 

 sometimes once-septate and slightly club-shaped. 



This fungus shows in pure culture certain growth characteristics 

 which seem to differentiate it somewhat sharply from other species 

 of Gloeosporium. In the first place it grows slowly upon nutrient 

 agar, several months being required to produce a colony of several 

 millimeters in extent. The hyphae become considerably colored 



FIG. 80. PSEUDOPEZIZA RIB is. (b, after Klebahn) 

 a, conidial stage ; 6, section of apothecium 



and often gray-green in appearance. The central portion of the 

 colony gradually forms a stromatic body. The cultures of the 

 ascus stage yielded the same type of colony, which is further 

 proof of the genetic connection between the two spore stages. 

 This is the first time that a fungus with all the characteristics 

 of a Gloeosporium has been experimentally connected with an 

 ascigerous form belonging to the Discomycetes. 



XV. PHACIDIACE^E 



In this family the apothecium develops with a surrounding 

 stroma, which is ordinarily coherent with the substratum. At 



