378 BOTANICAL GAZETTE [ NOVEMBER 
Fig. 20. A cystocarp with one mature lobe and two similar structures 
sactially acd, ta, trichophoric apparatus; c, carpogenous cell. 
Ptilota plumosa C. Ag. 
Fic. 21. Early stage in development of group of procarps; about the 
same stage as is shown in fg. 6 of P. serrata: cell 6 homologous with cell 
11; 5’ with 10’; §'’ with 10’’. 
Fig. 22. Somewhat later stage than fig. 27, very similar to fig.7 of p 
serrata ; numbered to correspond with fg. 27. 
Ptilota plumosa filicina Farl. 
Figs, 23-26 stained with Béhmer’s hematoxylin. 
Fic. 23. Carpogenous cell of procarp (c) with two nuclei ; 4a, trichophoric 
apparatus ; probably a stage preliminary to the formation of the first cell of 
the cystocarp. 
Fic. 24. One-celled stage of cystocarp; nucleus with a network of 
chromosomes. 
Fig. 25. Cystocarp with early stages of two lobes of the favella, the 
younger (/’) still a single cell having just been formed from the second cell 
the cystocarp (x'') 
