Diatom: a family of minute unicellular Algae having a siliceous covering of great delicacy, each individual multiplying by spontaneous division.
Flickr Artist: Trazy
The photographer has entered this photo in the 2008 Nikon Small World Contest.
The photographer has this to say about this image,
"This is a prepared slide that I found in an old dusty box. The slide is dated April 5, 1897 and contains exactly nine diatoms of three different types, meticulously arranged into an ornate pattern. The botanist that prepared this slide near the turn of the century was F.F. Forbes. The label on the slide reads "Diatoms in center from Hammonds Pond Brookline, Mass. Navicula peripunctata"."