ASCOMYCETES 



37S 



trichogyne is fertilised by the contact with it of one of the young hairs 

 The perithece contains a number of asci, and these eight or twelve double 

 ascospores. The ripe double ascospore attaches itself to a fresh host b) 

 one of its ends, and develops into the new plant. 



Fig, 312. — A : 6~h, Stigmaiomyces Baeri Peyr. (.5"^. Mitsccs Karsten). A, optical longi- 

 tudinal section of ripe specimen with organ of attachment at base ; the asci are seen 

 through wall of perithece. a, everywhere the appendage ', fi, an isolated ascus with spores ; 

 c—k, stages of development of perithece and appendage in order of letters. B, Laboul- 

 tenia ftagellata Peyr. a, the appendage. (^ , <r, ^, A x 350 ; b, d, e,f x 450 ; .3x125.) 

 (After Peyritsch.) 



2. ExoAscus (Fiickel). — The species of Exoascus mostly attack 

 fruits, and set up in them sometimes conspicuous deformities. Whik 

 some of them possess a mycele which penetrates the parenchyme of the 

 fruit, &c. (e.g. E. Pruni, Fckl., E. deformans, Fckl.), others extend nc 

 farther than between the cuticle and the epiderm-cells. In the formei 

 case the terminal cells of the hyphse which emerge from the surface 



