246 PLANT ANATOMY, 
The intercellular spaces in the fundamental tissue of the 
root-stock and in the leaf parenchyma of Aspidium Filiz mas 
(Fig. 162), which have been described by H. Schacht,’ are very 
remarkably constructed. All of the boundary cells of these 
cavities do not assume a special form, but some few of them 
grow in a spherical manner into the hollow space, through a pro- 
tuberance of the delicate wall in one or two places. The daughter- 
cell, which is thus produced, becomes immediately bounded by 
a transervse wall, and elevated upon a small stalk over the 
mother-cell in a head-like form (the “Zottenkopf,” or tufted 
head, of Hanstein). These small glandular cells thus remind 
Af ‘a 
. aaa = Z 
i qo] 
I= Fe IEA nes => sf 
Ld y 
— 4 
Sere 
me 2 
Fie. 163.—Latex-tubes (I!) from Radix Taraxaci. Tangential longitudinal section 
through the inner bark, 
one of the more simple forms of the above-described oil-pro- 
ducing trichomes of the Labiatew. In the fern-root the glands 
in their terminal head-like cell at first contain protoplasm, in 
which after a short time greenish oil-drops occur; these are 
finally forced out upon the surface of the gland, and envelop it 
as a thin greenish layer. This section consists for the most 
part of the peculiar filicie acid, which, by longer preservation 
_ under glycerin, crystallizes in long needles; volatile oil is want- 
ing here, or is present in but very slight amounts. Such in- 
_ tercellular glands have also been met with by one of us (F.) in 
-_-'1 Pringsheim’s Jahrb. f. wissenschaftl. Bot., iii. (1863), p. 352. 
