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Igor] GAMETOGENESIS AND FERTILIZATION IN ALBUGO 255 
If the Phycomycetes are related to Vaucheria it is from a 
period before the attainment of the uninucleate oosphere by 
Vaucheria. 
The coenogamete is homologous with some or all of the 
gametes of a plurigametic gametangium, not with the individual 
gametes of such a structure. 
There is a remarkable agreement between Albugo and 
Pyronema in many details. 
The coenogamete is a result of pushing the synplast habit 
from the vegetative body into the reproductive organs. 
The synplast of the Phycomycetes is a unit in both morpho- 
logical and physiological sense, although it is philogenetically 
the equivalent of many units. 
BOTANICAL INSTITUTE, BONN. 
BIBLIOGRAPHY. 
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BERTHOLD, 1880: Die geschlechtliche Pigieses von Dasycladus clavae- 
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BLACKMAN, Igoo: The primitive Algae and the Flagellata, an account of 
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CHIMIELEWsKY, 1889: Zur Frage iiber die Copulation der Kerne beim 
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