1892. | The seed coats of Malvacee. 37 
Measurements: thickness of seed coats, 90u; outer integu- 
ment, Qu; inner layer of same, 6; outer layer of same, 3p; 
palisade layer, 63; sub-palisade layer, 18¢; length of sub- 
palisade layer, 28p. 
CALLIRRHOE INVOLUCRATA Gray; fig. IV.—The outer 
layer, a, of the first integument is developed into large cells. 
This is just the reverse of C. triangulata. The cells are va-' 
triable; some are isodiametric,; they elongate gradually until 
some are almost linear tangentially. This layer is colorless. 
The inner portion of the palisade-cells, c, is almost trans- 
parent. The cell-cavity is very large and situated nearer the 
middle of the cell than in most cases. The light line is not 
sharp and quite near the outer end of the cell. The sub-pali- 
sade portion, @, is composed of two layers of large cells, the 
larger being nearer the palisade cells. 
Measurements: seed coats, 62; outer integument, 8; outer 
layer of Same, Ou; inner layer of same, 2é@; palisade layer, 
394; sub-palisade, 15,4. 
MALVASTRUM ANGUSTUM Gray; fig. V.— The second layer, 
4, of the outer integument is developed into radially elongated 
cells. These cells are about twice as long as wide. The 
outer layer contains no coloring matter. The cell-walls be- 
portion occurring outside of the cavity. This may account 
for the apparent dimness of the light line, /. The position 
nodosity prominent. The sub-palisade portion, @, contains 
one layer of very large dark brown cells. The large cells take 
Teena position. In some specimens they look like an (. 
his is not quite so striking in MW. coccineum Gray. 
Stipa Napaa Cav.; fig. VI.—The outer integument, a, 4, is 
: posed of two layers of cells about equally developed. 
: - shape in both layers is quite variable, from elongated 
adially to elongated tangentially. The cell-walls are col- 
red yellowish brown. 
= € Outer portion of the palisade cells, c, especially around 
€ cell Cavity, is more or less yellowish. The light line, 4, 
