f11b7f42d1181cb2582c2850981fe562

Licensehttp://creativecommons.org/licenses/publicdomain/
Rating2.5
VettedTrusted
Description
Under a moderate magnification of 225x, this 2006 scanning electron micrograph (SEM) depicted details of the morphologic surface characteristics of a "dandelion clock", from a Common Dandelion, Taraxacum officinale plant. The "clock" is the filamentous "puffball" of seeds arranged so as to be easily dispersed by the wind, or the breath of a curious child.

In this field of view the remnants of a seed attachment is visible as a small nub protruding from a small papule. It is from these nub-like points that the "parachute"-equipped seeds detach, and are blown away, sometime over a distance of miles. Note that this is the second in a series of PHIL images, 8791-8796, in which the magnification is increased, thereby, providing greater and greater morphologic detail of the point of the developing seed attachment.
Created: 2006

Original URLhttp://phil.cdc.gov/PHIL_Images/8792/8792_lores.jpg
photographerJanice Carr
providerPublic Health Image Library
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith