450 



RESEARCHES ON FUNGI 



At maturity the fruit-body, under dry climatic conditions (as 

 at Winnipeg), may sometimes remain closed ; but usually it dehisces 



FIG. 153. Secotium agaricoides a fungus resembling a Puff-ball, but closely allied 

 to Psalliota. A, a fruit-body developing its spores. B, a normal fully- 

 developed ripe fruit-body showing the peridium slightly separated from the 

 stipe below and longitudinally cracked ; branched gills and spores, concealed 

 under the peridium, now pulverulent. C, a fruit-body expanded to a much 

 greater extent than is normal, its body thus resembling the expanded pileus 

 of a Psalliota. Collected by W. S. Odell at Ottawa. Photographed by the 

 Photographic Division of the Canadian Geological Survey. Natural size. 



irregularly by means of one or more longitudinal rifts (Figs. 153, B, 

 and 155) or by part, or occasionally the whole, of the base of the 



