370 BOTANICAL GAZETTE [NOVEMBER 
tinct nuclei of the cells of the trichophoric apparatus (ta) are 
shown, and above them the trichogyne, which has just begun to 
wither, may be seen. In fig. 2¢ we have the one-celled condi- 
tion of a cystocarp, and the specimen is of particular interest 
because the chromatin of the nucleus is very well defined, hav- 
ing apparently gathered together into the chromosomes prepara- 
tory to nuclear division. Fig. 25 illustrates beautifully the man- 
ner in which a new lobe (*) arises from the second cell (’) of 
the cystocarp when an older lobe may be well along in its devel- 
opment. 
COMPARISON OF THE TYPE OF PROCARP AND CYSTOCARP OF PTI- 
LOTA WITH THOSE OF ALLIED GENERA. 
We have fortunately very good descriptions of the types of 
procarps and cystocarps of the genera most closely allied to 
Ptilota. The following have been carefully studied: Callitham- 
nion,* Pterothamnion,? Griffithsia,3 Ceramium,‘ Lejolisia,’ Spet- 
mothamnion,° Ptilothamnion,” and Spondylothamnion.° 
There are many differences in the precise cell arrangements 
of the procarps in the genera just mentioned, each having its 
peculiarities, and in none of them are the conditions vety 
much like those of Ptilota. However, in the following two cases 
certain resemblances are worth noting. 
In Callithamnion elegans Schousb., according to Bornet and 
Thuret (76), one of the segments of a branch gives rise to a 
cell from which is developed a three-celled procarp, the ba 
*Callithamnion corymbosum Lyngb. Bornet and Thuret (67) 1453 ger 
- C. tetricum Ag. Janczewski (77) 117. C. elegans Schousb. 
and Thuret (76) fasc. 1: 32. 7. zo. 
* Plerothamnion plumula Nag. Schmitz (83) 23, 24. 
3 Griffithsia corallina Ag. Janczewski (77) 122. G. Bornetiana Farl, Smith (96) 35: 
‘Ceramium decurrens Hary. Janezewski (77) 120. 
* Lejolisia Mediterranea Born. Bornet and Thuret (67) 148. 
© Spermothamnion ftabellatum Born. Bornet and Thuret (76) fase. 1: hs 
hemaphroditum Nig. Janczewski (77) 115. 2 
? Ptilothamnion pluma Thuret. Bornet and Thuret (76) fasc. 2: 179 pi. - . 
8 Spondylothamnion multifidum Nig. Bornet and Thuret (76) fasc. 2: 18%" 
pig. + 
