3 1 6 Wager . — On the Structure and 
stains light blue, the nucleolus reddish blue. The network of 
the nucleus appears to be distinctly granular. 
I have never been able to clearly observe nuclear division 
in the mycelium, although I have constantly seen appearances 
which gave me the impression that they were due to nuclei 
in a state of division. But the nuclei are so small and the 
amount of chromatin so insignificant that, judging by the 
difficulty I experienced in making out nuclear division where 
the nuclei are much larger, as in the oogonia, it will, I think, 
be extremely difficult to satisfactorily observe it here. 
Formation of Gonidangia. 
The gonidangia are produced on basidia, which are formed 
in large numbers just underneath the epidermis of the stem, 
leaves, and fruits. Protoplasm and nuclei pass into the basidia 
from the mycelium. The mycelium is very much branched 
and abundant in the region where the basidia are given off, 
and the cell-walls, especially in the later stages, are very 
much thickened and stain easily in haematoxylin. No fusion 
of nuclei has been observed in the basidia, such as has been 
described in the Basidiomycetes by Rosen, Dangeard and 
myself, and in the Asci of Ascomycetes by Dangeard and 
Harper. This is interesting, and tends to emphasize the 
different nature of the basidia in Cystopus as compared with 
those in the Basidiomycetes and Ascomycetes, which are to 
be regarded as exhibiting a kind of sexual fusion of nuclei (as 
has been shown by Dangeard, ’95 ; Harper, ’95 ; and myself, 
*93). In Cystopus , the formation of the conidia is preceded 
neither by fusion nor by division. Some five to eight nuclei, 
together with a quantity of protoplasm, accumulate at the 
apex of the basidium, which is then cut off by a transverse 
wall to form the gonidangium, as shown by Zalewski (’83) 
and Mangin (’91). The four to eight nuclei remain undivided, 
and each one becomes the nucleus of a zoospore. Each 
nucleus is surrounded from the beginning by a quantity of 
dense granular protoplasm, which tends to render it invisible, 
