TAXONOMY OF THE PILOBOLIDAE 213 



place, the rupture occurred at the constriction between the apophysis 

 and the subsporangial swelling. 



There is a possibility that this species is an abnormal form due 

 to the unfavourable environment in which it was growing. Sporangia 

 with defective black pigment in their walls have been observed by 

 van Tieghem himself in his P. oedipns and by Buller in P. longipes 

 {vide these Researches, vol. iv, p. 9, and this volume, p. 54). 



Illustration : Fig. 106. 



Insufficiently known Species 



10. Pilobolus Morinii Sacc. Syll. xvii. 505 (1905). 



Piloholus sp. Morini, in Mem. Accad. Sci. 1st. Bologna, ser. 5, 

 vol. viii, p. 85, with plate (1899-1900). 



Sporangiophores solitary, 600-800 \x high, each rising from an 

 erect ovoid trophocyst. Subsporangial swelling subglobose or ovoid, 

 somewhat narrowed above, and attenuated below into the sporangio- 

 phore, almost colourless when mature. Sporangium globular, some- 

 what flattened above, black, 130-200 [x in diameter ; columella 

 obtusely conical, colourless, rounded above ; spores globose, orange- 

 yellow (not colourless), 4-5-6 /z in diameter. 



On dry human excrement. Montese, Bologna, Italy. Resembling 

 P. nanus van Tiegh., except for its black sporangium and its 

 sporangiophores not arising in groups. 



11. Pilobolus Borzianus Morini, in Mem. Accad. Sci. 1st. Bologna, 

 ser. 6, vol. iii, p. 126 (or 396), f. 3-10 (1908). Sacc. Syll. xxi. 827. 



Sporangiophores 2-4-5 mm. high, growing two or three together 

 from one trophocyst, which is ovoid and often imperfectly developed. 

 Subsporangial swelling globose or shortly ovoid, 200-360 [x high, 

 almost colourless or quite hyaline. Sporangium globose, very 

 much flattened from above, 160-250 [x wide, intense bluish-black ; 

 columella hemispherical or shortly conical, without apophysis ; 

 spores spherical, deep yellow. 16-23 (x in diameter. Oval chlamy- 

 dospores are developed in the mycelium. 



Zygospores black, globose, about 180 ^ across, with a thick and 

 glabrous epispore (Morini, I.e. f. 3, 9). 



