174 



RESEARCHES ON FUNGI 



Pilobolus umbonatus is unique among Piloboli in having a 

 sporangium which is more or less conical and decidedly umbonate 

 (Figs. 81, 84, and 105, C-F). This characteristic enables one to 



Fig. SG.^Pilobolus Kleitiii. Two wild fruit-bodies of medium size, 

 left with drops, right with drops removed or dried up. Trans- 

 parent jelly around base of each dehisced sporangivim invisible in 

 the photograph. Subsporangial swellings pyriform. Magnifi- 

 cation, 61. 



recognise the species with certainty even with a hand-lens. Hundreds 

 of sporangia have been observed and in every one a more sharply- 

 rounded or less sharply-rounded umbo was present. The width of 

 the sporangium in well-grown fruit-bodies varies from about • 2 to 

 0-26 mm., and the height of the sporangium from about 0-14 mm. 

 to 0-19 mm. 



