44 



H. MARSHALL WARD. 



Pleospora, &c. 

 Uredinse Lichens 



Claviceps 



Xylaria 



Polysti 



Peziza 



Pyronema 



S ° 







ST ° 



6D (B 



a* 



Podosphsera and 



Erysiphess 



2 7! 



Peronosporeee. ^ m *+-< 



We may now shortly consider the chief results obtained by Kihl- 

 mann from cultivations of Melanospora parasitica, 1 a pyrenomyoetous 

 fungus found associated with, and parasitic upon Isaria. 



Isaria grows upon and destroys insect larvee, and Kihlmann ob- 

 served that large quantities of the perithecia of Melanospora soon 

 appear with it; the same is true for •' Botrytis — another insect killing 

 fungus. In both cases the sowing of Melanospora spores on these fungi 

 soon resulted in the formation of abundant perithecia. 



This, of course, only suggests, but does not prove, the parasitism of 

 the Melanospora on the Isaria, or Botrytis. 



Spores of Melanospora — whether coniclia or ascospores — if sown in 

 water only swell and throw out short tubes, which invariably die off 

 soon. The same happened with all the numerous nutritive solutions 

 tried. These solutions were varied not only as to composition, but 

 also as to concentration, &c. 



If a spore germinates in the neighbourhood of a living hypha of 

 Isaria, however, the germinal tube fixes upon the Isaria hypha and at 

 once emits more tubes, which are thicker and more vigorous than before. 

 If the germinal tube from the Melanospora spore comes within a cer- 

 tain maximum distance from a branch of Isaria its apex grows directly 



£ Op, citi 



