Methods of Reproduction in the Saprolegniacece. 197 
differs chiefly in having the hypha which bears 
the oocysts spirally curved and in the number 
and colour of the oospores). 
Mycelium, stout hyphae, as much as 75 /x thick, standing up out of 
the water, bearing either terminal or lateral sporocysts, which are 
cylindrical or club-shaped and vary much in size; several sporo¬ 
cysts are formed within the original case, forming “ nested 
sporocysts. 
Oocysts are spherical with a few fairly large spots on the 
smooth coloured wall. They contain many oospores. The oocysts 
are frequently borne terminally on short lateral branches, which 
spring in clusters from the main hypha. In some cases a more or 
less distinct “ Oogoniaphore ” may be formed terminating in a 
sterile hypha, a sporocyst, or an oocyst. Ooospores, spherical, 
concentric, 16—22//,, smooth, occasionally borne singly in an oocyst, 
but usually five or ten, and rarely as many as thirty in the same 
group. Resting period, 68 to 145 days. 
Antherocysts are always present and arise as lateral branches 
near the oocysts from the same main hyphae (androgynous). 
11 a. 5. motioica var. montana, de Bary (1888). 
Distinguished from the type species by a few minor differences 
only. The hyphae are much more delicate, having a lax appearance 
The hypha bearing the oocysts is often very very elongated and 
irregular in form. 1 The oocysts have thicker membranes, quite 
smooth, with entire absence of spots. 
III. 5. Mixta, de Bary (1888). 
Mycelium, delicate lax hyphae, sporocysts resembling those of 
the species. 
Oocysts are distinguished t by having very large prominent 
spots on the membrane. Oospores numerous and resemble those 
of the other species. 
Antherocysts (usually diklinous) present in 50% of the cases. 
IV. 5. Thureti, de Bary (1881). 
Synon. S. ferax (Gruith) Thuret, 1850. 
The S. ferax of other authors are quite distinct from this 
species, and when the name “ ferax ” is retained it must be 
indicated as above, not as 5. ferax (Gruith), Kiitzing, etc. To 
avoid all confusion, it is better to adopt the name given by de Bary, 
and completely banish the name ferax, 
