I20 



PLANT ORGANS OR PARTS OF PLANTS. 



dead stalks of former fronds and the chaffy remains of the 

 year's growth should be rejected. 



Description. — The slightly oblique rhizome, as it appears 



Fig. 25. — AspiDiuM. 

 Cross-section of Aspidium: dh, Glands, in parenchyma, P, which 

 surrounds the concentric fibro-vascular bundle, with X, the vessel por- 

 tion (xylem), made up of tracheids in the centre, surrounded hy Ph, 

 the sieve portion (phloem), the whole surrounded by the dark lined 

 endodermis (Moeller). 



in the market, should be about i to 5 cm. in diameter, 

 and from 10 to 25 cm. in length. It is completely covered 

 with the ascending bases of the old stems, which usually 



