520 BOTANICAL GAZETTE [DECEMBER 
Apical cells of Marsiliaceae.—‘‘Contributions to the developmental his- 
tory of the Marsiliaceae” is the rather broad title of a paper by SCHNEIDER,‘ 
dealing with the apical cell and its segmentation in the vegetative organs of 
this family. The first part deals with the main axis and the second part with 
the lateral organs derived from it, the leaf, branch, and root. The apical 
cell of the axis is so oriented that two segments are dorsal and one is ventral. 
Roots are derived from the ventral segments, while leaves and branches come 
from the dorsal. In the behavior of the apical cells and their segments Mar- 
silia and Pilularia differ from each other only in minor particulars. The 
work, which seems to be quite accurate, confirms and extends somewhat the 
earlier work of JOoHNSON.—CHARLES J. CHAMBERLAIN. 
Anatomy of Salicornia.—Miss DEFRAINE* has investigated the anatomy 
- Salicornia, and among the results the following are noted. The succulent 
“cortex” covering the internodes is phylogenetically derived from the basally 
developed leaf-sheath of the pair of leaves of the node above. The evidence 
for this seems quite convincing. The small, fleshy cotyledons fuse to form a 
cotyledonary sheath to the hypocotyl, similar to the leaf-sheath of the vegeta- 
tive shoot. The occurrence of every transition between spiral cells and stereids 
led to the conclusion that the two are homologous structures, the former 
functioning chiefly in water storage, the latter in mechanical support. A pecu- 
liar kind of secondary growth sets in early in both root and stem.—J. M. C. 
Endogenous gemmae.—The formation of endogenous gemmae is reported 
in Haplozia caespiticia by Bucu.? From within a gemma mother cell, num- 
bers of which develop on the swollen end of a stem, two to four gemmae are 
produced and set free by the bursting of the wall of the mother cell. Mucilage 
within the mother cell absorbs water, swells, and bursts the wall. Endogenous 
gemmae have heretofore been reported for two es first in Aneura by 
GoEBEL and later in Metzgeria by Evans.—W. J. G. LAnp. 

48 SCHNEIDER, Fritz, acetigh zur Entwickelungsgeschichte der Marsiliaceen. 
Flora 105:347-369. figs. 18 IgI 
4 DEFRAINE, EruHet, The anatomy of the genus Salicornia. Jour. Linn. Soc. 
Bot. 41:317-348. pls. F5, 10, 1013 
47 Bucu, Hans, Uber die Seiten. der oe 8vo. pp. ix+7o. pls. 3. 
Helsingfors: J. Simelii Arvengars Boktryckeriaktiebolag. 1 
