270 Farmer . — On the Embryogeny, etc. 
being formed in this plant in a plane parallel to, instead of 
at right angles to, that of the prothallium, as in most ferns. 
Fresh leaves and roots speedily arise on the young plantlet, 
the second leaf appears nearly opposite to the first one, and 
immediately above the first root. Its own root emerges just 
beneath the cotyledon. The third leaf arises (continuing the 
spiral) close to the side of the cotyledon and its proper root 
also emerges on the opposite side of the stem. The first two 
leaves are destitute of stipules, but these structures appear at 
once on the third leaf, where they are relatively large, and 
quite functional. The leaf-stalks, especially in the stipular 
region are covered with hairs containing a large quantity of 
tannin. 
EXPLANATION OF FIGURES IN PLATE XV. 
Illustrating Mr. Farmer’s paper On the Embryogeny of Angiopteris evecta , Hoffm. 
[£ = Basal wall. M= Median wall. T= Transversal wall, x = Apical cell.] 
Figs. 1, 2. Archegonia. 
Fig. 3. Consecutive sections through a very young embryo. 
Fig. 4. Median section through a similar embryo. 
Fig. 5. Section of embryo cut parallel to transversal wall ; (a) through the 
cotyledonary end, ( b ) through the stem-apex (shaded). 
Fig. 6. Longitudinal section of older embryo with root-cell. 
Fig. 7. Section, almost transverse, through embryo showing apical cells of the 
root. 
Fig. 8. Embryo cut obliquely with apical cells of root. 
Fig. 9. Median longitudinal section of embryo in the prothallium, with tannin- 
cells (shaded) in cotyledon. 
Fig. 10. Section (not quite median) of embryo in the prothallium. 
Figs. 11, 12. Longitudinal sections of part of the cotyledon showing tannin- 
cells (shaded). 
Figs. 13-17. Transverse sections of root-apices of young plantlets. — The curved 
wall in Fig. 15 is unusual. The arrangement of the cell-walls in Fig. 17 is 
irregular. 
Figs. 18-23. Young plantlets in various stages of development. In Fig. 21 two 
embryos are shown to have been formed on one prothallium. 
