1901 | GAMETOGENESIS AND FERTILIZATION IN ALBUGO 97 
carried outside of the region of the oosphere. In this respect 
A. candida differs from the other species of Albugo. 
SUMMARY. 
Albugo Portulacae. 
1. A. Portulacae possesses a multinucleate oosphere which 
develops in a manner very similar to that of A. Blitz (Stevens 
1899), 2. ¢. the nuclei all pass to the periplasm, dividing 
mitotically ; and some of the daughter nuclei reenter the ooplasm, 
divide again, their products becoming the female nuclei, the 
plasmoderma being differentiated in the meantime. 
2. Two mitoses occur in both oogenesis and spermatogene- 
sis. 
3. The nuclei return to the ooplasm after division much 
diminished in achromatic content. 
4. The nuclear figure of the second mitosis is clearly dis- 
tinguishable from the first by the diminished kinoplasm. 
5. The antheridial tube is multinucleate. 
6. The numerous antheridial nuclei fuse in pairs with the 
numerous oospheric nuclei, the number of fusion nuclei being 
usually larger than in A. Bliti. These fusion nuclei pass the 
winter without further change. 
7. A coenocentrum somewhat less highly developed than 
that of A. Bit is present. 
8. The receptive papilla in A. Portulacae is larger than in the 
other known species 
Albugo Tragopogonts. 
9. Amultinucleate oosphere develops in the same manner as in 
A. Bliti and A. Portulacae, and is then reduced to a uninucleate 
condition by disorganization of the supernumerary nuclei. 
10. The nuclei pass to the periplasm, divide, and return to 
the ooplasm much diminished in achromatic content. 
11. Two mitoses occur in oogenesis and spermatogenesis. 
12. The nuclear figure of the second division may be dis- 
tinguished from the first by a diminution of kinoplasm. 
13. The antheridial tube conveys one or more nuclei into the 
oosphere where one fuses with the female nucleus. 
