FRANSERIA DUMOSA. 17 
as follows: The epidermis has a relatively thin cuticle. At a distance of 
1.5 cm. from the tip its contents are colorless, but in the older parts a dark 
purple pigment is present. As previously mentioned, multicellular hairs 
and other hairs occur; these are to be found most abundant, perhaps, where 
no pigment is present in the epidermis. The secretion from these hairs, 
which is soluble in chloroform and ether, is so copious as to nearly sub- 
merge them, and covers the stem as far as the location of cork. The cortex 
Fic, 7.—Franseria dumosa: A, 
transverse section ofstem 1.23 
mm. in diameter, showing 
general distribution of chloro- 
phyll; B,detail of A, to show 
character of cortical chloren- 
chyma; C, secreting hair from 
young part of stem, to show 
presence of chlorophyll, which 
is indicated by stippling, on 
periphery of cells. The cells 
of the epidermis do not con- 
tain chlorophyll. 
A 
in stems 1.23 mm. in diameter and 5 cm. from the tip is composed of four 
well-defined tissues, which, enumerated from without, are collenchyma, 
parenchyma, hard bast, and soft bast. The collenchymatous and the par- 
enchymatous portions are chlorophyll-bearing; some chlorophyll may also 
be found in the ground-tissue between the hard bast and the cambium. 
The parenchyma exterior to the hard bast contains chlorophyll and is made 
up of cuboid cells with large intercellular spaces. 
