Ceratopteris t Italic troides , {Li) 
121 
EXPLANATION OF FIGURES IN PLATE VL 
Illustrating Miss Ford’s paper on Ceratopteris. 
Fig. i. Compound sterile leaf of Ceratopteris, showing vegetative buds ( b ) 
at the angles of the leaves, (f nat. size.) 
Fig. 2. Young vegetative bud still attached to parent plant, showing young 
simple leaves. (Nat. size.) 
Fig. 3. View of stem and petioles of a mature Ceratopteris plant from below. 
r. = roots, vb. = bundles of the petioles, s. = stem, b v = larger stem-bundles of 
outer ring, b t — smaller inner bundles. (Nat. size.) 
Fig. 4. Transverse section of a petiole bundle, scl. = sclerenchymatous sheath, 
end . = endodermis, p . = pericycle, pa. — parenchyma, st. = sieve-tubes, pp. «= 
protophloem, x. — xylem, p.x. = protoxylem. ( x 455.) 
Fig. 5. Transverse section of a stoma, (x 335.) 
Fig. 6. Transverse section of a large bundle from the stem. Lettering as in 
Fig. 4. (From a photograph.) 
Fig. 7. Transverse section of a small inner bundle of the stem. Lettering as in 
Fig. 4. ( x 455.) 
Fig. 8. Longitudinal section of young stem, showing the relation between 
the bundles of the stem, root, and petiole, r. = root, st. — stem, pi. — petiole, 
x. — xylem, p. — phloem. 
Fig. 9. Longitudinal section through apex of the stem. st. = stem, l. *=■ leaf, 
si. =? ramenta. (From a photograph.) 
Fig. 10. Transverse section through apical region of stem. st. = stem, /. — leaf, 
si. = ramenta. (x 75.) 
F'ig. 11. Longitudinal section through apex of young root. a. apical cell, 
/. = air-passages. 
Fig. 12. Transverse section of root below the apex. /. = air-passages, (x 455.) 
Fig. 13. Section of young sporangium, an. = annulus, sm. = spore-mother- 
cells. ( x 300 times.) 
Fig. 14. Longitudinal section through young vegetative bud. vb. = vascular 
bundle of leaf, a. = apical cell, si. — ramenta. (x 75.) 
Fig. 15. Ditto through older bud. (x 75.) 
