SEM picture of a seedling of Dactylorhiza majalis
(Photographed by Colin Clay using a Scanning Electron Microscope (SEM))

The seedling is growing on agar with an appropriate fungus in a Petri dish, having been 're-plated' (transplanted) once. The protocorm is now some 3 mm long and has a developing shoot at the right hand end. The 'whiskers' are the equivalent of root hairs (often called 'rhizoids'), and arise from much of the surface of the protocorm. At this stage, no proper roots or tubers have developed. The threads of the fungus are too fine to be seen at this magnification.