70 MISSOURI BOTANICAL GARDEN. 



a brownish color. The fungus was isolated and grown in 

 pure cultures on the wood of the red gum and on pine de- 

 coction agar, as well as on tubes of rice, potato, etc., the 

 following cultural characters being from both natural and 

 artificial cultures. The description differs but slightly 

 from that given by Ellis and Everhart* and has been 

 emended by the addition of the conidial stage. 



Mycelium. 



The colonies resulting from either ascospores or conidia 

 are white at first with a hyaline mycelium which later 

 becomes pigmented in certain of the larger filaments, assum- 

 ing a dark brown color. The filaments measure from 4 

 to Ifi in the mature forms. Conidia appear after 36 

 hours, and perithecia in four or five days. 



Conidia. 



The conidia are borne in short branching moniliform 

 chains in small clusters, falling together in irregular masses 

 as they mature (pi. 6, f. 1). They are unicellular, hya- 

 line, becoming guttulate when old, obovate to elliptical, 

 and measure from 4/x to 6.5/a by 2/u to 3.5/a, averaging 6fj> 

 by 3/z. 



Perithecia. 



The perithecia are brown at first, but when they are ma- 

 ture they become black and carbonaceous and are covered 

 sparsely with short, glandular hairs. They are globose, 

 or sometimes slightly flattened, measuring 50/a to 100/a in 

 diameter. The hairs measure 10fi to 32/a in length by 

 1 .hjx to 2fi. Each terminates in a gland or spherical enlarge- 

 ment measuring 2/* to 3/x in diameter. The peritheciumis 

 tipped by a long slender beak, black at the base, brown 



* Ellis, J. B. and Everhart, B. M. North American Pyreuomycetes. 

 p. 195. (1892). 



