230 



SOME \OVA SCOTIAX AC^UATIC FUNGI. — MOORE, 



oogonium, are centric in structure 

 and measure from 30-85/a in 

 diameter. Antheridial branches 

 are rarely absent, geneially two 

 or tliree arisinor from the filament 



a short distance below the basal 



wall of the oogonium. These are 



often branched. Antheridial 



%■- '\ branches fi-om adjacent filaments 



nut infre(|ui'ntl}' attach themselves 



to an oogonium, The anthei-idia are ahnost cylindrical or 



slightl}^ clavate, comparatively long. 



This species is the largest and most striking of the Acldyas 

 observed ami, in the \icinity of Sydney, is apparently one of 

 the uio.st common. It also appeared in material collected in a 

 pool on the " Barren " near Pictou, N. S. The filaments are 

 unusually stout in vigorous cultures, sometimes reaching 140/* 

 in diameter at the Ijase, and at times attaining a length of 

 almost 2''"- 'J'his species appears to be more sensitive than 



