120 ASCOMYCETES AND RHODOPHYCE #4, 
Batrachospermum, are the descendants of the fusion nucleus, result- 
ing from the union of male and female nuclei in the carpogonium. 
The nuclei of the auxiliary cells never take a morphological part in 
the formation of the carpospores. According to this view, therefore, 
the auxiliary cells are merely brood cells, their fusion with the cells 
of the sporogenous filaments representing a peculiar condition of nutri- 
Fra. 47.—Carpogonium and its development subsequent to fecundation in Dudresnya 
purpurifera.—(After Oltmanns.) 
A, carpogonial branch with young carpogone at upper end. 
B, Jater stage ; nucleus of carpogonium lies some distance up in trichogyre, whose end is twisted. 
C, still later stage ; nucleus lies in coiled part of trichogyne. 
D, carpogonial branch after fecundation; fusion of sporogenous filaments sf with auxiliary cells; 
az, auxiliary cells. 
E, later stage; sz, sporogenous cells ; az, auxiliary cells. 
tion, A further discussion of this phenomenon is reserved for a later 
paragraph. 
In order to comprehend fully the statements of the preceding para- 
graphs, it will be necessary to follow somewhat in detail the process 
involved in one of the forms referred to, as, for example, Dudresnya. 
In Dudresnya purpurifera, according to Oltmanns (’98), the car- 
