202 



RESEARCHES ON FUNGI 



(1875). Coemans, MonograpMe, pp. 57-8, pi, 2, f. 1-20. Sacc. 

 Syll. vii. 185. Grove, Pilobolidae, p. 333 (p. 33 of Reprint), pi. 4, 

 f. 16. Palla, Zur Kenntniss der Pilobolus-Arten, p. 399. 



Mucor urceolatus Dickson, Fasc. PI. Crypt, part 1, p. 25, pi. 3, 

 f. 6 (1785). Sowerby, Evglish Fungi, pi. 300. Bolton's figure under 

 this name {Fung. Halif. pi. 133, f. 1) is doubtful. 



Pilobolus urceolatus Purton, Midland Flora, vol. iii, p. 323, pi. 31 

 (1821). 



P. microsporus Brefeld, Botan. Unter such., -part 4, p. 70, pi. 4, f. 16, 

 19-22 (1881). 



Not P. crystallinus of Bonorden, or of Cohn, or of Klein, or of 

 Brefeld, or of many others. 



Sporangiophore 5-12 mm. high, or even up to 2 cm., rising 

 usually from a single, more or less erect, terminal, ovate trophocyst, 



which is often concealed in the sub- 

 stratum ; occasionally the trophocyst 

 may be intercalary. Subsporangial 

 swelling ovoid or elliptic-ovoid, about 

 1 mm. high, 600-800 \l broad. Spor- 

 angium convex above, from half as wide 

 to nearly as wide as the subsporangial 

 swelling, usually 350-500 \x in width ; 

 columella conical, faintly blackish-blue ; 

 spores ellipsoid, pale yellowish or quite 

 colourless, 5-10 [j. long (8-10 x 5-6 \x, 

 vanT. ; 5-12 x 3-6 [ji, Palla ; 6 x4-7pi, 

 Brefeld; 7-11 x 4-5-7, Dewevre). 



Zygospores subglobose, 140-200 ]x 

 in diameter, nearly smooth, faintly 

 coloured, filled with oil-drops (Krafczyk. 

 in Ber. d. D. Bot. GeseU. 1931, p. 145, 

 f. 2). Apparently not quite mature. 



On dung of cows, horses, and the 

 like. Reputed common. Europe, North 

 and South America, Porto Rico, etc. 

 Not seen by Buller at Winnipeg. 

 The upper cutinised part of the sporangium, when it is dried up, 

 is sometimes marked with a few polygonal reticulations (one central) ; 



Fig. 99.— Ripe fruit-body and 

 spores : A, Pilobolus Kleinii 

 (= Brefeld's P . crystallinus) ; 

 B, Pilobolus crystallinus 

 (= Brefeld's P. microsporus). 

 Copied by A. H. R. Buller 

 from Brefeld's Untersuch- 

 ungen. Magnification : fruit- 

 bodies, 20 ; spores, 200. 



