Vessels of tomato plants cvs Craigella and Potentate colonized by Verticillium
albo-atrum hyphae were examined by transmission electron microscopy (TEM). Many
hyphae appeared enveloped in an electron-dense deposit which was frequently
layered, resulting in a sheath of concentric bands. The thickness of the deposit
ranged from 0·03 to 0·5 μm, and was often associated with loosely connected,
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