II] 



ASCOMYCETES 



37 



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 bv 

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



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; 

 x6oo. 



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. After the fructifi- 

 cation has puffed once or a few times a rest of some hours during which 



533SO 



