Methods of Reproduction in the Saprolegniacece. 189 
TABLE I. 
Classification of the Saprolegniace/E 
(From Rabenhorst-Cryptogamen Flora, Abt. IV., p. 326), 
Sub-Family Saprolegniacece. 
Mycelium composed of cylindrical hyphte of uniform diameter 
not constricted into segments. 
I. Spores after discharge swarm and germinate outside the 
sporocyst. 
(1). All spores discharge from the sporocyst through the 
same opening. 
a. 
aa. 
bb. 
Zoospores discharged motile and immediately 
disperse by active swarming. 
Monoplanetic. 
a. Sporocysts egg-shaped ; after discharge new 
sporocysts arise as a lateral branch. 
Pythiopsis. 
Diplanetic. 
Elongated sporocysts; after discharge new 
sporocyst grows up inside the wall of the old 
one. 
a. Sporocysts club-shaped ; containing many 
rows of spores. Oocysts contain many 
oospheres. Saprolegnia. 
/3. Sporocysts tubular ; containing a single row 
of spores. Oocysts contain a single oosphere. 
Leptolegnia. 
b. Zoospores non-motile on discharge; collecting at 
mouth of sporocyst to form a hollow sphere before 
encystment. 
aa. Sporocysts club-shaped ; containing many rows of 
spores. Oocyst contain many oospheres. Thick 
membrane. Achlya. 
bb. Sporocysts tubular ; containing one row of spores 
(amoeboid). Oocysts contain a single oosphere. 
Membrane very thin. Aphanomyces. 
(2). Each spore encysts within sporocyst and is discharged 
