498 



LIFE-HISTORIES 



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Fiu. 327. — Water-mold (Saprolcgiita Thureti, Water-mold Family, 

 Saprolegniaccw). A, dead fly attacked by water-mold, surrounded 

 by radiating hyphse terminating in swarm-spore-eases, i. B, swarm- 

 spore-case in which the spores are forming, soq. (', same, discharging 

 swarm-spores. E, female gamatangium containing four female gametes 

 to which comes a iirojection from the male gamrtangium that arises 

 as a branch hyphafr'>m In-low the ftmiale gnmetangium, "-i". (Thuret, 

 DeBary.) — "Water-molds abound upon dead insects, etc., in water. 



a convex partition, swells into a sporangium which becomes 

 filled with a nmiiber of spores. These are soon scattered, 

 and are then ready to produce new mycelia in the manner 

 already descriljed. Such non-sexual spores, serving as do 

 swarm-spores for rapid multiplication, float like dust in the 

 air, and may thus be distinguished as dii.'^t-sjxireK. 



Comparatively large and resistant zygospores arc formed by the 

 conjugation of special Ijraiiches as shown in Fig. 326. The zjrgospore 



