44 



PTERIDOSPERMEAE 

 B 



[CH. 



FIG. 404. Lyginopteris oldhamia. 

 A, B. Frond fragments; a, pinnule; b, reticulum of sclerenchyma. 



C. Portion of stele of the stem reproduced in fig. 402. 



D. px, protoxylem; s, sclerenchyma; leaf-trace close to the edge of the 



secondary xylem; p, periderm. 



E. Petiole; m, meristele. 



(A, Kidston Coll. 664 B; B, Camb. Botany School 508; C, Binney Coll. 179; 

 D, E, Camb. Botany School, 93, 159.) 



