in th : 
the cells which are to form the gemmiparous area. 
1908] BARNES & LAND—CUPULE OF MARCHANTIA 403. 
notions of it i i 
its homology with an air chamber, as we now proceed to 
i fresh material was at hand from thrifty plants of 
alle ntia polymorpha, grown under glass by Mr. JoHN Cook, the 
" u ana of the department, who has taken much pains with 
e cultivation of Hepaticae. Being transferred directly from the 
iG, 3. . 
eid . Sele area (p) out- Fic. 4.—Stage nearly as in fig. 33 
Y adjacent tissues. w, a rim cell cutting off the primordium 
of a lobe of the cupule. 
iy to the fixing fluids, the material was in exceptionally good 
ondition. 
— figures show usually only the cell walls, the perfectly preserved 
 . : being omitted for the sake of clearness. Mitotic figures 
Sere. mmon, showing that the cells were in active growth. The 
ee of longitudinal sections, except jig. 13, are all drawn to 
-. € scale, and having been reduced one-half are now magnified 
out 625 diameters. 
Longitudinal sections through the apex of gem 
» aS near to the apical cell as the third segment, 
miferous plants 
a differentiation 
Instead of 
