TAXONOMY OF THE PILOBOLIDAE 



201 



be recognised with certainty. After them are placed others which 

 have been insufficiently or negligently described, and which are 

 possibly nothing but variants of some of the preceding species : 



Doubtful Species 



10. P. Morinii. 14. P. minutus. 



11. P. Borzianus. 15. P. pullus. 



12. P. argentinus. 16. P. Schmidtii. 



13. P. roseus. 



6 



Key to the Species of Pilobolus 



(Sporangium decidedly umbonate . 

 (Sporangium rounded above . 



[Trophocyst much elongated 

 [Trophocyst ovoid or turnip-shaped 



Spores globose and elhpsoid in the same sporan 

 gium ...... 



Spores globose or subglobose only 

 Spores elhpsoid only .... 



(Spores with two coats .... 

 (Spores with only one coat 



Sporangium yellow when projected 

 Sporangium black when projected. 



Spores from 10 (x upwards in length 

 Spores averaging less than 10 (x in length 



[Spores 5-10 x 4-6 [i ; sporangium large 

 (Spores 6-8 x 3-4 (x ; sporangium small 



umbonatus 

 1 



longipes 

 2 



heterosporus 



3 



5 



oedipus 

 4 



nanus 

 sphaerosporus 



Kleinii 

 6 



crystallinus 

 roridus 



(Probably crystallinus and roridus are merely forms of one species.) 



A. Sporangium black ivhen mature ; no apophysis. 



1. Pilobolus crystallinus Tode, I.e. p. 46, pi. 1 (1784). Van 

 Tieghem, Trois. Mem. in Ann. Sci. Nat. ser. 6, vol. iv, pp. 335-8, 

 pi. 10, f. 4, 5, repeated from Bull. Soc. Bot. Fr. vol. xxii, pp. 283-4 



