406 BOTANICAL GAZETTE [DECEMBER 
cells divide transversely (p, p, fig. 8), and soon another division occurs 
(p, fig. 9), by which three cells are formed, a basal cell (6), a stalk 
cell (s), and a gemma cell (g). The latter continues to divide in the 
I cs 
Se 
SOS 
BER OC 
saat 
Fic. 9.—Progressing transverse (p) Fic. 10.—Basal cell of p undergoins 
and longitudinal (f) division of gem-__ longitudinal division; w, MuC — 
muparous cells; the former producing a developed and depression deepened; J, 
basalfcell (6), a stalk cell (s), and a~ young air chamber; 4, 44 shows rela- 
gemma cell (g). tion of cupule and air chamber. 
fashion frequently described and figured (cf. also figs. 11; 12, 13) 
and finally produces the gemma. The stalk cell undergoes _ 
further division, but the basal cell divides longitudinally at least once 
(P, fig. 11). Later it may undergo repeated division, producing -— 
