II] 



ASCOMYCETES 



17 



conditions of moderate dryness, such as occur out of doors on a fine autumn 

 day, by shaking the fructifications, or even by currents of air set up by 

 walking past them. It can be initiated, as de Bary pointed out, when ripe 



Fig. 4. Mitrula laricina Mass. ; 

 development and ejection of 

 biseriate spores, x 600. 



Fig. 5. Sepultaria coronaria Mass.; uni- 

 seriate spores ; ascus opening by a lid ; 

 branched, septate, clavate paraphyses; 

 X 600. 



isolated asci lying in water are suddenly exposed to the action of glycerine 

 or alcohol, and is clearly due to alterations of tension affecting a 

 number of asci at about the same stage of development 

 cation has puffed once or a 



After the fructifi- 



few times a rest of some hours during which 



