1898-99. ] 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
PHOTOGRAPH 
MORPHOLOGY OF THE CENTRAL CYLINDER IN THE ANGIOSPERMS, 635 
DESCRIPAION. OF THE’ PLATES. 
PLATE VII. 
1.—Transverse section of a young stem of Pteris aguilina, at the point of 
origin of the second leaf. (X 4o.) 
2.—Transverse section of the older stem of P. aguzlina; 7’ and /* are 
(X 25.) 
leaves ; ris a root. 
3-—Transverse section of the stem of P. aguzlina above the region of 
forking of the stelar system; a and 4 are the two cylindrical 
steles ; 7is a leaf-trace. (X 15.) 
4.—Transverse section of the young horizontal rhizome of P. agudlina. 
(X 25.) 
5-—Transverse section of the older horizontal rhizome of P. aguzilina. 
(X 25.) 
6.—Transverse section of a still older region of the same. (X 25.) 
PLATE VIII. 
7.—Transverse section of young stem of Primula farinosa. (X 40.) 
8.—Transverse section of the older stem of P. farinosa ; 71 and /* indicate 
the foliar gaps ; 71 and 7? are roots. 
(X 25.) 
9.—Transverse section of the same stem with same lettering as pho- 
tograph 8, (X 25). 
o..—Transverse section of the young stem of WMelumbium luteum, at the 
point of origin of the cotyledons. (X 25.) 
11.—Transverse section of part of the tuberous region of the stem of 
Symplocarpus fetidus, showing the so-called *‘ astelic’’ condition. 
y gs 
(X 25.) 
12.—Transverse section of cylindrical portion of the stem of the same, 
showing the ‘‘medullated monostelic ” 
terma; a, peripheral strands; 6, foliar traces. 
condition; e, phlceo- 
(X 20.) 
PLATE IX. 
3-—Transverse section of the young stem of Ranunculus acris. (X 25.) 
14.—Transverse section of the older stem of 2. acris. (X 25.) 
15.-—Transverse section of the older young stem of 2. abortivus. The 
internal phloeoterma is still perceptible. (X 25.) 
16.—Transverse section of the older young stem of 2. rhombotdeus. The 
internal phloeoterma cannot be distinguished. (X. 25.) 
