SOME XOVA SCOTIAN A(^UATIC FUNGI. — MOOKE. 



233 



iiiuni, 

 ■as the 



tlie antheridial branch arising from the same filament 



oogonium, some distance below the latter. 



HypliBB with sporangia, apparently those of an 

 Aphanomyces, appeared in several cultures from 

 materials collected at various points near Sydney, 

 but in only one case, from material collected at 

 Cossit's Lake in October, 1908, did oogonia appear. 

 The maximum diameter of the oogonia on the 

 plants examined was about 30/^1. I am not aware 

 that this species has been previously reported 

 from America. 



Family LEPTOMITACE.€. 



Genus Leptomitus Agardh. 

 Leptomitus lacteus (Roth), Agardh. (Figs. 21, 22). Hyphae 

 delicate, constricted at intervals, the largest rarely exceeding 

 40/i ill diameter at the base, decreasing in successive segments 

 rarelj^ branching elsewhere than at the distal ends of the 

 segments. Cellulin grains conspicuous about 10/x in diameter 



Proc. & Trans. N. S. In.st. Sci.. Vol. XII. 



Trans. 16. 



