NUCLEUS-SHEATH. 203 
vascular cryptogams, of monocotyledons and some dicotyledons,' 
F1a. 120.—Transverse sections through rootlets of Actea spicata. a, epiblema; b, fund- 
amental tissue; c, phloém; e, inner bark; k, nucleus-sheath; z, cambium; 7, medullary 
rays; v, xylem. 
1 Compare C. van Wisselingh, ‘‘ De Kernscheede bij de wortels der 
Phanerogamen,” Amsterdam, J. Miller, 1884. (From: ‘‘ Verslagen 
