An Electron-microscopic Investigation of the Walls of Conifer Cambium

Electron-micrographs of the primary walls of conifer cambium reveal the type of structure already found in other primary walls, except that no area of ‘loose’ microfibrils appear to be present. In addition, groups of fibrils are visible radiating from a centre which appears to be granular and recalling strongly the putative islands of synthesis reported in Valonia.