PLANT MICKOKADIOGRAPHY 



24 



W^'"''^ 



25 



26 



PI. IV 



-Figs. 24, 25, 26: Comparison of different microscopic techniques on cross sections of Nerium leaf. 

 Fig. 24: Normal light microscopy. Fig. 25, Polarizing microscopj-. 



Fig. 26: Microradiography. Diverse kinds of tissue or inclusions appear with the different tech- 

 niques ; in particular both lignin and Ca oxalate crystals are more evident with microradiography , 

 X.50 



Interpretation of Microradiographs: Exact- jury of fresh .section or complications arising 



ness of interpretation is a function of pre- from components such as sap or included 



vious plant knowledge, theoretical considera- bodies of tissue. Among main observ^ations 



tions and calculations. The worker must made on plant tissues, mention should be 



know possible artefacts from fixatives, in- made of the largest diversity of mineral 



W3 



