JRMS OF PLANT CELLS. 
FORMS OF CELLS. 
49 
Epidermis 
The outer 
layer of 
herbaceous 
plants 
Isodiametric, 
polygonal or 
branched 
Organized, 
water 
Cutin, wax, 
mucilage, 
calcium 
oxalate, 
calcium 
carbonate or 
silica 
No pores, 
except in the 
parts of the 
flower 
Sieve 
Forming a 
part of the 
phloem 
Elongated 
Albuminous 
substances, 
occasionally 
starch 
Cellulose 
Simple pores, 
connecting 
sieve cells 
Tracheids 
Forming a 
part of the 
xylem. espe- 
cially in the 
Coniferse 
Elongated 
Water, air, 
sugars or 
tannin, 
mucilage, 
resin 
Ligno- 
cellulose 
Bordered 
pores or 
scalariform 
thickenings 
Ducts or 
Tracheae 
Forming a 
part of the 
xylem 
Elongated 
Water, air, 
sugars, 
tannin, 
mucilage, 
resin 
Ligno- 
cellulose 
Annular, 
spiral or 
reticulated 
thickenings, 
simple or 
bordered 
pores 
5 2 
m tn 
n& 22 
M M 
*4 3 3* 
£ a 
<U O 
a tUD 
* 
" o 
•o p. 
d 3 m 
O g 
.2 a g "3 
g a 2 "3 
UO<H 
>•400 
o** 
0) ad 
« 3 
m >» 
,3 
OJ V 3 <V 
bo5 m 3 
fliH ad ” 
Is 
n 3 
*5 g 
aS a 
be aS 
c| 
te ^ 
>-3 aJ 
Cfl 
■S'S^ 
ad czf -3 
3+5 +* 
^ 3*3 
H>,h 3 
sa 
S.g 
d 
■dig 
a> oj.p a> 
• 2 ^ 2 * 
gja 
w o ° m 
be ii . M 
i-SflO 
°»p 
o o 
“I 
pj 3 
J&*" a 
•P-P “ 
03 tJ m 
3 Gdrrt 
® 0)3 
paa 
<D <D 
be-d 
O cd 
> 3 Q 
0.8 & 
fc 0.8 
|s.sr 
a >2 
n be 
°fl 
®3 « 
qO h 
3 O 
Htift 
a) ,n 
4^ 3. 
3 3® 
S » a> 
3® 5 
jj 
n 
•3d 3 
3 a ad 
O 3 
3 d 
.23 
od 
3.a> 
0*3 
O ° 
g|3 
3 ® o 
gd «< 
t-> .3 
£ 
bed 
3 od 
3 * 
sd*3 
s ° 
