Summary
Scanning electron microscopy and transmission electron microscopy (carbon replicas) confirm the existence of a deep longitudinal groove on one side of the pyriform body of the zoospores of Phytophthora palmivora. Upon encystment the cell rounds off but the groove may be temporarily retained as a depression on the cyst surface. The carbon replicas revealed significant differences in outer surface texture: the zoospore surface is finely granular whereas the outer surface of both young and mature cysts are distinctly microfibrillar with only occasional patches of amorphous material.
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Desjardins, P.R., Wang, M.C. & Bartnicki-Garcia, S. Electron microscopy of zoospores and cysts of Phytophthora palmivora: Morphology and surface texture. Archiv. Mikrobiol. 88, 61–70 (1973). https://doi.org/10.1007/BF00408841
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DOI: https://doi.org/10.1007/BF00408841