338 RESEARCHES ON FUNGI 



is a hollow thin- walled chamber which is oval, 1-5-2 inches in 

 diameter, and lined within by the hymenium. At first the hymenial 

 chamber is quite closed but, at maturity, it becomes slit from the 



Fig. 172. — Urnula geaster. A fruit-body with six valves, 

 almost fully expanded, the hymenium exposed to view. 

 Found on a root of a dead elm, Ulrnxis crassifolia, at E)en.- 

 ton, Texas, U.S.A., and photographed by W. H. Long. 

 Natural size. 



apex downwards into about six triangular segments (Fig. 172). 

 These segments then bend outwards and downwards, reminding 

 one of the segments of the outer peridium of a Geaster. Hence 

 the specific name. The puffing stage, according to information sent 



