Plate XVII.

A piece of Haastia pulvinaris, from above and from below.

Plates XVIII. and XIX.

• Fig. I. A piece of Haastia pulvinaris, natural size. a, stem stripped of leaves.

• Fig. II. Diagram showing branch system.

• Fig. III. Cross-section of young stem, with leaf-base. e., epidermis; c, cortex; r.p., resin-passage.

• Fig. IV. Section of year-old stem. phel., phellogen; f., fissure in cork; scl., sclerenchyma; s.t., sieve-tubes; c, cambium; v., wood- vessel; w.f., fibre; m.r., medullary ray; s.v., spiral vessel.

• Fig. IV. A, B, C, D, stages in formation of resin-passage.

• Fig. V. Longitudinal section of year old stem.

• Fig. V. A, sclerenchyma found in phloëm; B, medullary ray, longitudinally elongated, pitted; Cf, wood -fibre; tr., tracheide; p.v., pitted vessel; s.v., spiral vessel.

• Fig. VI. Transverse section of older stem.

• Fig. VII. Transverse section of young root. a, piliferous layer; r.h., root-hair; pp., protophloëm; 2nd ph., secondary phloëm; c, cambium; 2nd x., secondary xylem; 1st x., primary xylem; x.v., vessel.

• Fig. VIII. Longitudinal section of same.

• Fig. IX. Transverse section of older root.

• Fig. X. Longitudinal section of same.

• Fig. XI. A, B, leaf; natural size. A, upper surface; B, lower surface; C, A enlarged; D, B enlarged; E, C stripped of hairs; F, D stripped of hairs; p., projections.

• Fig. XII. Section of base of leaf. v, upper surface; d, lower surface; p., phloëm; x., xylem; st., stoma; c.l., chlorophyll layer; b., base of hair.

• Fig. XIII. Longitudinal section of open leaf. a, terminal point; h, young hair; st., stoma; a.c, air-cavity; r.p., resin-passage of a bundle of network cut transversely; sp.v., spiral vessel, seen longitudinally.

• Fig. XIII. A₁, A₂, epidermis with stomata. B, hair; b., small-celled base, with nucleus in each cell, n. The other cells have pitted, pointed ends.