PILOBOLUS UMBONATUS 



^73 



The stipe at its base where it adjoins the basal swelling is about 

 0-065 mm. thick. It increases slightly in thickness upwards until, 

 just beneath the subsporangial swelling, it is about 0-1 mm. thick. 

 At the top of the stipe, 

 just beneath the sub- 

 sporangial swelling, 

 there is an orange 

 band of protoplasm. 



The subsporangial 

 swelling (Figs. 81, 84, 

 88, and 105, C-E) is 

 ellipsoid, its greatest 

 diameter being about the 

 middle of its length. In 

 well-grown fruit-bodies 

 it is about 0-65 mm. 

 long and 0-46 mm. 

 wide. Like the stipe, it 

 exudes numerous colour- 

 less mucilaginous drops 

 (Fig. 84). In lateral 

 view in air, when seen 

 with a hand-lens, its 

 base appears very pale, 

 thus differing from the 

 subsporangial swellings 

 of P. longipes and P. 

 Kleinii in which an 

 orange tint is readily 

 observable. 



The subsporangial 

 swelling of Pilobolus um- 

 bo7iatus resembles that 



of P. longipes in being ellipsoidal and having its maximum diameter 

 about the middle of its length, but differs from that of P. Kleinii 

 which is distinctly pyriform (c/. Figs. 81, 84, and 88 with Figs. 85 

 and 86). 



Fig. 8.5. — Pilobolus longiprs. Upper part of a wild 

 fruit-body of medium .size. Drops on sub.spor- 

 angial swelling drying up, tho.se on sporangium, 

 already dry. Transparent jelly around base of 

 dehisced sporangium not visible in the photo- 

 graph. Magnification, (Jl. 



