Betts. — Rosette Plants at Cass. 



271 



Root (fig. 30). — The central cylinder is small, and is surrounded by a 

 clearly marked endodermis, which, as in the rhizome, consists of irregular, 

 thin-walled, suberized cells. The pericycle consists of a single layer of 

 cells about the same size as the endodermal cells, and with thin cellulose 



Fig. 29. — Brachycome Sinclairii. Transverse section of rhizome (x 175). 



a, cortex ; b, canal ; c, epithelial layer ; d, endodermis ; e, pericycle 



fibres ; /, phloem ; g, xylem ; h, medullary ray. 

 Fig. 30. — Brachycome Sinclairii. Transverse section of root (x 175). 



a, suberized cells ; b, cortex ; c, endodermis ; d, pericycle ; 



e, phloem ; /, xylem. 



walls. The xylem forms a compact triangular-shaped mass, and its elements 

 have thick walls. The phloem forms three large masses, and consists of 

 sieve-tubes, companion cells, and phloem parenchyma, all of which have 

 their elements of small diameter. 



