SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Colour-enhanced Scanning Electron Micrograph (SEM) of mullein (Verbascum thapsus) pith. The pith in the stems of dry plants such as this has the microstructure of a solid foam of air cells, ranging in size from approximately 100 to 150 micrometers in diameter. Image width: 2464.9 micrometers. Magnification: 40.5x if the image is printed 10 cm wide.
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