PLATE II. 



Part of the outer cortex and periderm of the ADgiospermic 

 stem Saururopsis which is infested by the fungus Petro- 

 sphoeria japonica, Stopes & Fujii. V. 11969. 



M. The outer limit of the stem, shghtly crushed and destroyed 



adjacent to the granular mineral matrix of the section. 

 K. Cells of periderm layers in which hyphae and other cells of 



the fungus are principally developed, 

 C. Inner cells of cortex in which are hyphae of fungus, but no 



other fungal cells which appear to have been vital at the 



time of petrifaction. 

 H. Fungal hyphae, at H' a part showing the septate condition. 

 T. Groups of thickened cells of the fungus. 

 E. Cells in the cortex containing blackened " frothy" substance 



which may be, due to the fungal cells, or may be due to 



some natural secretion of the plant. 



Magnification x 300. (p. 270) 



