116 The Botanical Gazette. [Mareh, 
thallus cell which bears the procarpic branch and the auxil- 
iary cells. In all these cells the protoplasm becomes very 
much denser and the nuclei increase greatly in size in marked 
contrast to the ordinary vegetative cells of the thallus. The 
nuclei do not fuse. It has been suggested by several investi- 
gators that cytoplasmic activity of this nature is for nutritive 
purposes and the writer is inclined to believe this to be true 
of Champia. 
The auxiliary cells are then cells in the neighborhood of tie 
procarpic branch whose protoplasm has changed in charactet 
in a similar manner to the cell contents of the latter struc 
ture. They are not specially developed organs of the frond 
ate cells, quite lacking the clear well defined cell struct | 
which we usually expect of sexual elements. | 
University of Chicago. 
EXPLANATION OF PiateEs VII anp VIII. 
Preparations stained with Mayer’ i All Ser", 
l s acid haemalum. hE 
a a wit Abbé camera and are as follows: a, auxiliary cal 
bul cell; ¢, carpogonium; i internal filament; f, cell of pr 
; Ow Carpogonium; ¢, thallus cell bearing proc 
Scouts i “ere eine Figure 1 apie ters; 
ut 730 di . apes 
ure 14 about 260 Jlaieiae cine Ai arn 
