SEM picture of fungus threads on orchid root-hairs
(Photographed by Colin Clay)

This high-magnification picture, where the scale-bar at the top represents only one-tenth of a millimetre, shows the intimate contact between the thin fungus threads and the fatter orchid root-hairs (rhizoids). At the top of the picture several fungus threads can be seen passing through the cell wall into (or out of) one of the rhizoids.