oosmi 



-.OF AN INCh 



Characteristic Forms of the Sporangia and Spores of Saprolegnia. 



I. — A zoosporangium full of nearly ripe zoospores from the skin of a living 

 diseased salmon. 



II. — An empty zoosporangium, through the centre of which the hypha is growing 

 in order to produce a new zoosporangium. From the fresh growth of Saprolcgnia 

 on the diseased jaw membrane of a salmon, cut off and placed in water. 



III. — A dictyosporan^ium from salmon Saprolegnia cultivated on a dead fly. The 

 spores have remained in the interior of the zoosporangium, and, after encasing 

 themselves, have there germinated. 



IV. — Zoospores of salmon Saprolcgnia, germinating in water. 



V. — An oosporangium of Saprolcgnia from the pike, cultivated on a dead fly. The 

 oosporongia of the salmon fungus in all respects resemble this. 



Signification of the letters :—/*.'/, hypha ; zspn, zoosporangium ; rspr, zoospore ; 

 oospn, oosporangium ; oospr, oospore ; anth, aiitheridial filament ; an, antheridium. 



