278 
PHARMA COGNOSY. 
thickened, somewhat collenchymatous ; oil globules 
numerous. 
10. Chimaphila. — Dark green; calcium oxalate in 
rosette-shaped crystals 40 to 60 /x in diameter ; meso- 
phyl with irregular reddish-brown tannin masses. 
11. Eucalyptus. — Dark green ; calcium oxalate in 
rosette-shaped crystals or monoclinic prisms 15 to 25 
P in diameter ; outer wall of epidermal cells about 20 
H thick. In leaves from younger parts of the tree the 
outer wall of the epidermal cells is 5 to 8 // thick. 
11a. Granatum. — (See No. 20.) 
R. CALCIUM OXALATE IN MONOCLINIC PRISMS. 
a. Secretion and Non-Secretion Hairs Present. 
12. Hyoscyaraus. — Dark green ; calcium oxalate in 
single or twin monoclinic prisms about 10 n in diam- 
eter, occasionally in rosette-shaped crystals; non-secre- 
tion hairs numerous, one to five-celled; secretion hairs 
numerous, of three different kinds, stalks one to four- 
celled, glandular heads one to many-celled. 
b. Only Non-Secretion Hairs Present. 
13. Cardamomum. — (See No. 33.) 
14. Hamamelis. — Dark green; calcium oxalate in 
monoclinic prisms 7 to 20 /i in diameter, frequently in 
crystal fibers ; non-secretion hairs one-celled, about 
0 - 5 mm. long, more or less curved, thick-walled, with 
yellowish-brown contents, arranged in groups of about 
fifteen, and spreading from the base; mesophyl with 
irregular tannin masses; sclerenchymatous fibers thick- 
walled, lignified and with simple pores. 
15. Senna. — Light green ; non-secretion hairs 01 to0'2 
mm. long, one-celled, thick-walled, the wall of the 
upper part strongly cutinized, with numerous slight 
centrifugal projections; calcium-oxalate crystals rosette- 
