68 



MISSOURI BOTANICAL GARDEN. 



size in so far as the colonies and perithecia are concerned ; 

 but on the other hand, both the couidia and ascospores are 

 constantly much smaller. In nature, the perithecia that 

 mature are often surrounded by several closely adhering 

 dark bodies, which are either sclerotia or abortive peri- 

 thecia, apparently the latter. This feature has never been 

 noted with other species of Geratostomella. In view of 

 the differences, it is thought best to separate this form 

 from C. pilifera and it is named C. Schreiikiana, in 

 honor of Doctor von Schrenk, who first collected the 

 fungus and noted its peculiarities. 



The following cultural characters are taken from a large 

 number of natural and artificial cultures : — 



Mycelium. 



Conidia or asco- 

 spores, if sown on agar 

 plate cultures, germi- 

 nate in a few hours, 

 and after a day have 

 formed conidia, if the 

 temperature is favora- 

 ble. The most favora- 

 ble temperature for 

 growth is 80° to 90° 

 F. The filaments and 

 hyphae remain white 

 for several days, and 

 often become massed 

 in a furry outgrowth in 

 which strands of fila- 

 ments unite into upright 

 clusters or false heads. 

 (See figure). After a 

 few days' growth, por- 

 tions of the mycelium 

 lying next the agar 



C. SCIIUKNKIANA, X 50 - 



Dendroid fruiting tuft. 



become pigmented with a brown color, and rapidly develop 



