TAXONOMY OF THE PILOBOLIDAE 



203 



but the reticulations are not always so geometrical as van 

 Tieghem represents them, and they can be found also in other species. 

 Illustration : 99, B. 



2. Pilobolus longipes van Tiegh. Trois. Mem. in Ann. Sci. Nat. 

 ser. 6, vol. iv, pp. 338-340, pi. 10, f. 11-15 (1876), repeated from 

 Bull. Soc. Bot. Fr. vol. xxii, pp. 283-4 (1875). Grove, Pilobolidae, 

 p. 335, pi. 6, f. 1. Sacc. Syll. vii. 185. Palla, I.e. p. 399. 



P. roridus Brefeld, in Bot. Zeit. 1875, p. 852 ; Botan. Untersuch. 

 part 4, p. 70, pi. 4, f. 17. 



Sporangiophore 2-3 cm. high, sometimes 4-5 cm. or even 

 6-7 cm. ; trophocyst usually external to the substratum, elongated 

 horizontally, 1-5-2 mm. 

 long, golden-yellow, 

 almost cylindrical or 

 slightly tapering, giving 

 rise to the stipe at one 

 end. Subsporangial swell- 

 ing oval, rather less than 

 1 mm. broad. Spor- 

 angium globose, black, 

 about 500 [X across ; 

 columella broadly conical, 

 tinged with bluish- 

 black ; spores globose or 

 ovoid, 12-15 X 10-12 (x, 

 the wall rather thick 

 and tinged (often very 

 faintly) with bluish- 

 black, contents yellow- 

 orange. 



On dung of horses. Europe, Canada, U.S.A. 



Distinguished by its large roundish spores, its elongated tropho- 

 cyst, and its height. 



Illustration : Fig. 100. Other illustrations in this volume : 

 Figs. 18, 24, 40, 57, 70, 82, 83, 85, 91, and 96. 



>^S?^ 



Fig. 100.- — Pilobolus longipes v. Tiegh. A, whole 

 fruit-body. B, trophocyst. C, basal swelling 

 and part of stipe. D, upper part of fruit- 

 body enlarged. E, spores : n, intact ; b, broken 

 open. Reproduced by photography from 

 van Tieghem's Troisieme Memoire. 



