ASCOMYCETES 



375 



which there converge series of cells producing successively (terminally 

 and laterally) pycnospores. These are about twice as long as broad, and 

 very thin-walled, but surrounded by a hyaline gummy substance. Not 

 only are all these forms on record, but the mycele shows a tendency to 

 pass into a resting state, and single cells or groups of cells becom- 

 ing detached add to the means of propagation. There is some 

 contradiction involved in the accounts of the occurrence of some o\ 



Fig. 309. — Claviceps purpurea Tul. Longitudinal section of portion of sclerote, ;«, in Sphacelia 

 stage, producing conidiospores, c (much magnified). (After Tulasne.) 



these forms and the order of their succession given by Bauke and by 

 Gibelli and Griffini, and further research may be expected to throw 

 light on the matters in dispute, as also on the question whether or not we 

 "have here one species very rich in spore-forms or two species resembling 

 each other, but each less rich in forms. 



13. Claviceps (Tul.). — The peritheces of Claviceps purpurea (Tul.) 

 appear as it were in a kind of capitulura (immersed in the same stroma). 



