1894. ] The Genus Naegelia of Reinsch. 51 
at the time either on the germination of the oospores or the 
details connected with the process of fertilization. 
Hyphe.—The hyphe, as has been already stated, con- 
sist of successive segments connected by constricted portions, 
which may be plugged by a deposit of cellulin, or, more com- 
monly, are without any such pseudo-septum, the contents of 
successive segments being, as a rule, in direct communica- 
tion with one another. The primary axis originates as a 
single basal cell or segment which is attached by its rough- 
ened surface directly to the substratum, without rhizoidal 
outgrowths. It is often more or less bent and distorted but 
otherwise undifferentiated, except that its protoplasmic con- 
tents may be separated into isolated masses (fig. 9), through 
the partial obliteration of its cavity by deposits of cellulin. 
Above this basal segment the habit of growth characteristic 
of the plant begins directly. The primary axis may be con- 
tinued by several successive segments, but more frequently it 
divides almost immediately into two or more secondary axes. 
This Successive and more or less irregular multiplication of 
axes Is continued from the base to the summit of the plant, 
any given segment producing distally one to several similar 
segments, the whole resulting in a copiously branched and 
Spreading structure. In addition to the new segment or seg- 
ments which may arise from the distal end of any given seg- 
ment, reproductive organs, whether zoosporangia, oogonia or 
antheridia, are usually produced either singly or more com- 
monly'in whorls of from two to (rarely) six, zoosporangia be- 
ing often associated in the same whorl with oogonia or with an- 
theridia. Each of the organs just mentioned is separated from 
its parent segment by the characteristic constriction which in 
the case of the zoosporangia and oogonia is furnished with a 
cellulin plug. 
Zoosporan 
Porangia are 
: Vv : ‘gfe ‘ar 
asites, and in ery frequently attacked by chytridiaceous par 
such cases often become considerably distorted 
