Monotropaceae with Reference to Ericaceae 



55 



Fig. I. Longitudinal sections (X250) of root-tips of 



1. Chimaphila umbellata 



2. Pyrola rotundifolia 



3. Monotropa hypopitys 



4. Monotropa uniflora 



C = root cap, E = epidermis, F = free hyphal filaments, S = hyphal 



sheath. 



