Morphology of Phyllocladus alpinus , Hook . 
265 
EXPLANATION OF PLATES XVII AND XVIII. 
Illustrating Miss A. Robertson’s paper on Phyllocladus alpinus. 
r. — resin passage;^. == normal xylem ; cpx. — centripetal xylem ; ph. = phloem ; st. — stomate; 
px. = protoxylem ; b. = paired bundles going to a branch ; l.t. = leaf-trace ; Lb. — leaf base ; 
sc. = scar of attachment to cone axis ; ar. = arillus ; br. = bract ; 0. = ovule ; pr. — prothallus ; 
m m. = megaspore membrane ; p.t. — pollen-tube ; n. — nucellus ; i. = integument ; scl. — sclerized 
layer of integument ; pp. = platform of pitted cells ; p.tr. = tracheal platform ; emb. = embryo ; 
s. = suspensor ; i. ==. idioblast. 
PLATE XVII. 
Fig. 1. Branch showing cone shortly after pollination, cladode, leaf-bud, and leaf-scars. 
x 4 circa. 
Fig. 2. Diagrammatic transverse section of cladode. x 28. 
Fig. 3. Rather young lateral bundle cut radially, from tangential section of a cladode. X 386. 
Fig. 4. Transverse section of lateral bundle from a cladode. x 386. 
Fig. 5. Stomates from transverse section of a cladode. x 386. 
Fig. 6. Transverse section of terminal leaf-bud such as that shown in Fig. 1. x 74. 
Fig. 7. Diagrammatic transverse section of an axis, x 28. 
Fig. 8. Cone (same age as Fig. 1) cut lengthways, x 3 circa. 
Fig. 9. Ovule and bract (same age as Fig. 1). x 3 circa. 
Fig. 10. Diagrammatic transverse section of cone-stalk drawn in Fig. 1. x 28. 
Fig. it. Radial section of ovule and bract shortly after pollination, x 28. 
Fig. 12. Transverse section at a, Fig. 11. x 28 and x 74. 
Fig. 13. Transverse section at B, Fig. 11, showing closure of micropyle. x 28 and x 74 * 
Fig. 14. Transverse section at C, Fig. 1 1. x 28 and x 74. 
Fig. 15. Longitudinal section at D, Fig. 11. X 74. 
Fig. 16. Longitudinal section at E, Fig. 11. x 74. 
Fig. 17 (a and b). Cone and seed somewhat older than that shown in Fig. 1. x 4 circa. 
Fig. 18. Longitudinal section of base of seed shown in Fig. 17 B. x 28. 
Fig. 19. Single pitted cell from palisade below megaspore. See pp. in Fig. 18. x 386. 
Fig. 20. Short tracheids from platform at base of seed. See p.tr. in Fig. 18. X 386. 
Fig. 21. Details of sclerized layer in integument of seed whose base is shown in Fig. 18 ; 
A, nearer base; and b, higher up. x 386. 
PLATE XVIII. 
Fig. 22 (A and b). Two views of cone two or three months older than that shown in Fig. r. 
x 5 circa. 
Fig. 23. Endosperm of cone of age of Fig. 22 showing embryo and suspensor. x 43. 
Fig. 24. Edge of endosperm showing megaspore membrane, x 580. 
Fig. 25. Hermaphrodite cone, x 7 or 8. 
Fig. 26. Normal cP cone, x 7 or 8. 
Fig. 27. Ripe pollen-grain, x 580. 
Fig. 28. Transverse section axis of a 71 cone below stamens, x 112. 
