210 



RESEARCHES ON FUNGI 



8. Pilobolus umbonatus Buller, in his Researches on Fungi, 

 vol. VI, pp. 177-17^, figs. 81-84, 87-91 (1934). 



Fruit-body 3-9 mm. high, arising from an oval to turnip-shaped 



Fig. 105.- — Pilobolus umbonatus Buller. A, well-grown fruit-bodies 7-8 mm. 

 high. B, less well-grown fruit-bodies 1- 5-3-0 mm. high. C and D, 

 whole fruit-bodies, showing sporangium, subsporangial swelling, stipe, 

 and basal swelling attached to an apophysis ; C was 4 mm. high, and 

 D 3-5 mm. high. E, the upper part of a fruit-body, showing the um- 

 bonate sporangium, the barrel-shaped subsporangial swelling, and part 

 of the stipe. F, the same seen from above ; ratio of width of spor- 

 angium to width of subsporangial swelling = |. G, the greyish 

 columella, seen after removal of the sporangium from the top of the 

 fruit-body. H, a basal swelling a, attached to an apophysis b. I, a dis- 

 charged sporangium : a, the black sporangium -wall ; b, the colourless 

 fringe of the sporangium -wall ; and c, adhesive jelly. J, a similar spor- 

 angium, but jelly is not shown ; the surface of the sporangium-wall in I 

 was smooth, in J wrinkled. K, three discharged and dried-up sporangia 

 seen in lateral view. L, spores. M, diagram showing a spore of P. 

 umbonatus enclosed by a spore of P. Kleinii, in turn enclosed by a spore 

 of P. longipcs. Drawn by A. H. R. Buller from material obtained at 

 Winnipeg. The drawings C and D reproduced from pencil drawings 

 made by Hans Ritter. Magnification : A and B, natural size ; C and 

 D, 15 ; E-K, 75 ; L and M, 255. 



basal swelling or trophocyst which may be terminal or intercalary, 

 single or dispersed at intervals along a coarse stolon-hke main hypha. 



