Abnormal thistle stem, light micrograph

Abnormal thistle stem, light micrograph

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Caption: Abnormal thistle stem. Light micrograph of a normal (top) and abnormal (bottom) stem of the perennial sow thistle (Sonchus arvensis). The abnormal stem has grown in a flattened, or fasciated, manner. This is thought to be due to injury or infection to the stem meristem (the actively growing tissue), which causes a row of proto-stems to form and then fuse together to form the flattened structure seen here.

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Keywords: abnormal, anatomical, anatomy, biological, biology, botanical, botany, comparing, comparison, cross-section, deformed, deformity, duo, fasciated, flattened, fused, growth deformity, light micrograph, light microscope, meristem, microscopy, monstrosity, nature, normal, pair, perennial sow thistle, phloem, plant, section, sectioned, sonchus arvensis, stem, teratology, transverse, two, vascular bundle, vessels, xylem

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