64 



THE ROYAL SOCIETY OF CANADA 



cells consisting of one complete tracheary element, a portion of a 

 secondhand a parenchyma cell. . Adjacent to this row (at the left of the 

 fîgure)£a narrow ard apparently much longer element with bordered 



Fig. 15. — Pinus strohiis. 



Cotyledon — transverse at centre — x 500. 



b. — Bast; cf. — Centrifugal xylem; cp. — Centripetal xylem; e. — 



Endodermis; p. — Parenchyma; p.x. — Protoxylem; tt. — Transfusion 



tissue. 



pits is found. At the flanks of the secondary wood (Fig. 19) are 

 tracheid-like elements which, even including those situated immedi- 

 ately within the endodermis, are of considerable length. 



Fig. 16. — Pinus strobus. 

 Cotyledon — long, radial median sect. — x 500. 

 cf. — Centrifugal; cp. — Centripetal xylem; 

 e. — Endodermis: p. — Parenchyma; 

 px. — Protoxylem; tt. — Transfusion tissue. 



