i) THE COMPOUND OOSPHERE OF ALBUGO BLITI 245 
The sperms ina mass appear dark but individually are hyaline except at 
anterior end which bears the nucleolus. See also fig. 37, Plate XJ. 
Fic. 86 (see fig 83). The base of the antheridial tubé filled with dark 
staining cytoplasm and few nuclei. 
Fic. 87. Just after discharge from antheridial tube, periplasm as in fg. 
#2, several small masses of nuclei apparently both male and female sur- 
founded by denser cytoplasm (these masses seem to arise by the breaking 
_ Martofthe contents of the antheridial tube and soon disappear), primitive 
_ wall well developed, antheridium above, ooplasm coarsely and irregularly 
vacuolate, 
Fig. 88. Nuclei fusing in pairs, primitive wall distinctly thickened. See 
_ Plate XI, figs. 36-40. 
PLATE XV. 
All figures magnified 1500 diameters. 
Fig. 89, Protoplasm collecting in dense network toward the center of 
the oospore, leaving light peripheral strands where the endospore is soon to 
I. 
& Fig. 90, Shows the remains of the antheridial tube in the periplasm, with 
_ *Mtrace of its former presence in the ooplasm. The oospore is of the age 
town in fig. 88 
Fi, gt, Primitive wall mature, exospore forming, now consisting of a 
Porous semi-transparent mass with imbedded disks which are to form the 
"ges, vacuoles in ©ospore filled with gelatinous substance, nuclei of proto- 
plasm overstained, 
Fig. 92, Somewhat 
: Suspore more clearly, 
‘ad giving a Surface yi 
Mie. 93. £ 
- Sloontaining 
younger than the last figure, showing structure of 
presents edge view and also a fragment bent back 
€w, gelatinous substance in vacuoles. 
“ospore nearly formed, primary endospore complete, vacuoles 
F 8elatinous substance. 
newle, > Padimentary secondary endospore, gelatinous substance in 
FIG. 95. Oi forming in oospore. 
1G, 
With ng io Spore Walls complete, including double endospore, vacuoles 
ls, Aisin aaee substance, oil accumulating in large drops on the endospore 
Fig, 
97. Winter Conditions of exospore, the ridges higher than in previous 
Rages, | ; j 7 
We central oil-like mass, nuclei in sporoplasm. Section not directly 
™ le so that the endospore appears thicker than it really is. 
*9. Exterior of ripe oospore. 
a 
