S04 
PHARMA GOGNOSY. 
or less lignified sclerenchymatous cells; the lignified 
cork cells are more numerous. 
7 CALCIUM OXALATE IN CRYSTAL FIBERS. 
144. Quercus Alba. — Light brown ; bast fibers long, 
thick-walled, lignified ; crystal fibers containing rosette- 
shaped crystals or monoclinic prisms of calcium oxa- 
late about 10 to 20 /jl in diameter; stone cells thick- 
walled, with numerous lamellse and simple pores; 
parenchyma with irregular yellowish-brown tannin 
masses. 
b. Calcium Oxalate Wanting-, 
a CONTAINING POLLEN GRAINS. 
145. Arnica Flores. — (See No. 63). 
146. Crocus. — (See No. 65). 
147. Santonica. — Light brown ; pollen grains nearly 
spherical, nearly smooth, three-pored, 15 to 20 // in 
diameter; secretion hairs of two kinds, either with one 
or two short cells or with two to three pairs of cells. 
If a few c.c. of an alcoholic (95 per cent.) extract be 
heated with a few drops of potassium hydrate solution, 
a reddish color is produced. 
/S POLLEN GRAINS WANTING. 
1. STONE CELLS NUMEROUS- 
149. Cubeba. — Light brown ; stone cells single or in 
isolated groups, nearly isodiametric, thick-walled, with 
numerous simple pores, and colorless or light-yellow 
contents ; sclerenchymatous fibers few, short, thick- 
walled, strongly lignified; parenchymatous cells with 
reddish-brown tannin masses ; oil-secretion cells with 
suberized walls; oil globules numerous; fragments of 
powder becoming wine-colored with sulphuric acid. 
2. STONE CELLS WANTING. 
150. Gentiana. — Light brown ; ducts few, scalariform 
or reticulate ; intermediate fibers non-lignified and 
