612 
MR. F. O. BOWER ON THE COMPARATIVE MORPHOLOGY OF THE 
Description of Figures. 
PLATE 37. 
Pilularia. 
Fig. 1. Apex of the stem of Pilularia globulifera. ap. Apex. 1, 2, 3-7. The succes¬ 
sive leaves, b-^bq. The successive buds. r 3 -r 6 . The corresponding roots. 
X 70. 
Fig. 2. Dorsal side of a similar apex with two young leaves (1-2), and bud b . 2 seen 
obliquely. X175. 
Fig. 3. Leaf ( l ) and corresponding bud (b) of Pilularia. h, h. Hairs. X325. 
Osmunda. 
Fig. 4. Arrangement of cells at the apex of the leaf of Osmunda regalis : the arrows 
show the median plane of the leaf, and point towards the apex of the stem. 
X 175. 
Fig. 5. Apex of the leaf of 0. regalis, with the two last-formed pinnae (p^-ps) i the leaf 
has already assumed the circinate vernation, which accounts for the 
apparently unsymmetrical position of the apical cell. X 130. 
Fig. 6. Osmunda cinnamomea. Apex of the leaf before the first pinnae appear, show¬ 
ing the relation of the wings (w, w ) to the segments of the apical cell. X 70. 
Todea. 
Fig. 7. Apex of the leaf of Todea superba, showung the segments of the apical cell 
with their sub-divisions less regular than in Osmunda. X 175. 
Fig. 8. Sections of the leaf of Todea superba. b. Transverse, a, c. Longitudinal and 
median : these illustrate the origin of the wings (tv) at the base. X 20. 
A ngiopteris evecta. 
Fig. 9. Apex of the stem of A. evecta, showing a conical apical cell, with its segments. 
X 175. 
Fig. 10. Young leaf of A. evecta seen from above; ap. is the apex : the arrow points 
towards the apex of the stem. X 20. 
Fig. 11. Father older leaf seen from the ventral side. X 20. 
Fig. 12. Median longitudinal section of the apex of the same leaf of A. evecta as is 
represented in fig. 15. The cells (x, x) are two of the group of four apical 
cells. X175. 
