microscopic symptom

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microscopic symptom

plant pathology

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diagnosis of plant diseases

In plant disease: Symptoms
Microscopic disease symptoms are expressions of disease in cell structure or cell arrangement seen under a microscope. Macroscopic symptoms are expressions of disease that can be seen with the unaided eye. Specific macroscopic symptoms are classified under one of four major categories: prenecrotic, necrotic, hypoplastic,…
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Sanmiguelia

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Sanmiguelia

fossil plant genus

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Sanmiguelia, genus of fossil plants based upon impressions of palmlike leaves from the Triassic Period (251 to 199.6 million years ago) found in rocks from Colorado. It may be among the earliest of angiosperms, or flowering plants. The elliptic leaves were pleated, up to 40 cm (16 inches) long and 25 cm (10 inches) wide, and borne at the tip of a tapering stem.

This article was most recently revised and updated by William L. Hosch.