EXPLANATION OF THE ILLUSTRATIONS 
Prare VI. Fic. 1. Portion of root of Juncus sp. isolated from 
postglacial peat. Age approximately 4000 to 5000 years. 
The heavily lignified fibrous and conductive tissue in the 
center of the root has been largely degraded, whereas the 
delicate unlignified epidermal structures are preserved. 
132. 
ia, 2. Root epidermis of Scirpus sp. from same peat. Note 
preservation of epidermal cells. 126. 
Fig, 3. Root epidermis of Carex sp. from same peat. * 126. 
Fic. 4. Root tip of unidentified monocotyledonous root from 
same peat. Note preservation of minute structural details of 
root cap. ‘Treated with acidified sodium chlorite. ~ 126, 
Fig. 5. Cells of a root apex meristem from the same peat 
showing preservation of primary cell walls and the residue 
of cell contents. Thin section of peat, unstained, 500. 
Fic. 6. Root epidermis of Carex sp. showing preservation of 
unlignified primary walls of epidermal cells. 126. 
