498 LIFE-HISTORIES 
Fic. 327.—Water-mold (Saprolegnia Thureti, Water-mold Family, 
Saprolegniacee). A, dead fly attacked by water-mold, surrounded 
by radiating hyphe terminating in swarm-spore-cases, t. B, swarm-: 
spore-case in which the spores are forming, 29°. C, same, discharging 
swarm-spores. H#, female gamatangium containing four female gametes 
to which comes a projection from the male gametangium that arises 
as a branch hypha from below the female gametangium, #2°.  (Thuret, 
DeBary.)—Water-molds abound upon dead insects, ete., in water. 
a convex partition, swells into a sporangium which becomes 
filled with a number of spores. These are soon scattered, 
and are then ready to produce new mycelia in the manner 
already described. Such non-sexual spores, serving as do 
swarm-spores for rapid multiplication, float like dust in the 
air, and may thus be distinguished as dust-spores. 
Comparatively large and resistant zygospores are formed by the 
conjugation of special branches as shown in Fig. 326. The zygospore 
