PLATE 48 



A. Cross-section of kava-kava root (Piper methysticum, Forst., f.) 



1. Unequal diameter medullary ray cells. 



2. Vessels. 



3. Wood parenchyma. 



4. Wood fibres. 



B. Cross-section of white pine bark (Pinus strobus, L.). 



1. Wavy medullary rays with tannin. 



2. Parenchyma cells. 



3. Sieve cells. 



