1899] THE COMPOUND OOSPHERE OF ALBUGO BLITI 239 
OurMaNNS, 95. Ueber die Entwickelung der sexualorgane bei Vaucheria. 
Flora 80 ; 
SADEBECK, 83. Untersuchungen iiber die Pilzgattung Exoascus. Jahrb. 
der wiss. Anstalten zu Hamburg —: Io1. 
Trow, 95. The karyology of Saprolegniaceze. Ann. Bot. 9: 609. 
—— 95. Trans. Roy. Irish Acad. 30: 640. 
WaGer, 90. Observations on the structure of the nuclei in Peronospora 
parasitica, and on their behavior during the formation of the oospore, 
Ann, Bot. 4: 127. 
—— 9. On the nuclei in Hymenomycetes. Ann. Bot. 6: 146. 
_—— 96. On the structure and reproduction of Cystopus candidus Lév. 
Ann. Bot 10; 295. : 
IALEWSKI, 83. Zur Kenntniss der Gattung Cystopus. Bot. Cent. 15: 215. 
TMMERMANN, 96. Physiologie des pflanzlichen Zellkernes 129, 146. 
EXPLANATION OF PLATES XI-XV. 
All figures are from material killed in chrom-acetic acid and stained with 
Fleming's triple stain, unless otherwise indicated. The figures were sketched 
Abbé camera, using the following combinations of lenses: Zeiss 2" 
3 . 1.30, with compensating ocular 18 and 12; also Bausch & Lomb 4, 
: cleaned no. 4. These combinations give respectively the following 
_ '"“ignifications when projected to the table level: 3300, 2200, and 1500 
there “me Plate XI i not reduced in reproduction. All other plates are 
: ourths of the original scale. 
PLATE XI. 
Al drawings repres 
 alied «: ent a magnification of 3300 diameters, and were 
: with Zeiss lenses, 
ee. 1 : : 
oF - Resting nucleus in mycelium, linin faint, nucleolus prominent. 
6.2. Nucleus in flowin 
aes g cytoplasm near entrance of oogonium. 
the Nucleus 'n antheridium, spirem stage, membrane faint. 
: hatin "eed small drops accumulated on the linin network, the 
Fig. Som net, nucleus becoming spindle-shaped, no centrosome — 
Pete, chromant somewhat later, linin threads have almost entirely disap- 
TeMains of ge Scattered through nucleus, nucleolus to the right, 
Fis. 6. 4 ‘nin strand to the left 
a Sram more spindle-shaped, globules arranged in the equato- 
RE, no Spindle bea round bodies about equal to the chromatin dots in 
*etbrane. €rs, the definite line bounding the whole of the nuclear 
zz 
