Illustration of Pleated Fan Structure - Scientific Diagram 'b' #3459191 (License: Personal Use)

This is a vintage-style line engraving showing a conical, pleated structure with radiating linear striations and a curved base. The label 'b' suggests it is part of a series of comparative illustrations, possibly from a 19th- or early 20th-century scientific text. The shading and fine hatching indicate depth and texture, typical of anatomical or botanical plates.

Used in educational or historical scientific publications to illustrate morphological features-e.g., gill structures in fungi, leaf venation, or mollusk mantle folds. Matches user intent for academic reference, taxonomy study, or image identification in biology.