208 



RESEARCHES ON FUNGI 



cultivated his species, and fo\md that it retained its characters up 

 to fifteen generations. But it is in no way different from my 



forma sphaerosjjora of Pilobolus 

 Khinii. The irregularity of the 

 spores is exactly what I found 

 in my cultivations, and the 

 retention of the characters 

 may be due merely to the 

 persistence of similar conditions 

 throughout the whole series of 

 his fifteen generations. If I 

 am right in my opinion, the 

 three species here numbered 

 4, 5, and 6 are all identical, 

 and the variations in form are 

 dependent upon the surround- 

 ing circumstances. 



Illustration : Fig. 103. 



c 



0, 



0^g3o0o°0 



D 



QP 

 o 



Fig. 103.^ — Pilobolus heterosporus Palla. 

 A, fruit-body, after dehiscence of 

 the sporangium. B, fruit-body, 

 after removal of the sporangium, 

 showing the columella. C and D, 

 spores. Copied by A. H. R. Buller 

 from Palla's Zur Kenntniss der 

 Pilobolus- Arten and reduced to two- 

 thirds. Magnification : A and B, 

 30; C, 214; D, 434. 



7. Pilobolus oedipus Mont. 

 Memoire sur le genre Pilobolus, 

 in Ann. Soc. Linn, de Lyon, 

 pp. 1-7, f . a-i (1828). Coemans, 

 Monograjphie, pp. 59-60, pi. 

 1, f. 1-20. Grove, Pilobo- 

 lidae, p. 308, pi. 4, f. 14-15; 

 and in Journ. Bot. vol. xxii, 

 p. 131, pi. 245, f. 3. Sacc. Syll. 

 vii. 186. Palla, I.e., p. 400. Bainier, Etude, pp. 43-4, pi. 2, 

 f. 1-10. 



P. crystallinus Cohn, Entwicklungsgeschichte des Pilob. crystal- 

 linus, with pi. 51, 52 (1851). 



P. reticulatus van Tiegh. in Ann. Sci. Nat. ser. 6, vol. iv, p. 336. 

 Not the P. oedipus of Brefeld or of Klein, nor perhaps that of 

 van Tieghem {Nouv. Rech. 1875, p. 43). 



Sporangiophores yellow or reddish, usually short and thick, 

 about 2-3 (or even 5) mm. high, rising singly from a roundish 



