Virtual Microscopy
Microscopy Primer
License Info
Image Use
Custom Photos
Partners
Site Info
Contact Us
Publications
Home

Visit Science,
Optics, & You


The Galleries:

Photo Gallery
Silicon Zoo
Pharmaceuticals
Chip Shots
Phytochemicals
DNA Gallery
Microscapes
Vitamins
Amino Acids
Birthstones
Religion Collection
Pesticides
Beershots
Cocktail Collection
Screen Savers
Win Wallpaper
Mac Wallpaper
Movie Gallery

The American Elm

The American (or White) elm (Ulmus americana) is a hardwood tree comprised of three primary species whose habitat ranges from central Canada to Texas and east to the Atlantic Ocean. Principle features of elm timber are the pore rings having a single row of vessels that are very uniform in size and often visible to the unaided eye. The sapwood is grayish white to light brown, and the thick heartwood ranges from light to dark brown, often with a reddish tinge.


Cross Section


Radial Section


Tangential Section

This native tree is another important species that has fallen victim to the fungal blight called Dutch Elm Disease, which was first discovered in 1930 and has since killed hundreds of thousands of trees. Efforts are being made to develop disease-resistant strains of the Elm tree, but like all tree research, this will probably take many years. Elm wood, with its ability to withstand rough handling and superior bending qualities, is useful for making boxes, crates, and furniture (especially with bent parts such as rockers).

As revealed in the digital images of stained (iron-alum hematoxylin and safranin) thin sections presented above, the minute structure of the wood shows a porous texture with simple perforation plates. Vascular tracheids, having spiral thickening, are present in the early-wood porous zones and the wavy bands comprising late-wood vessels. The rays are unstoried and generally 3 to 6 seriate and homocellular. Ray-vessel pitting is simple to bordered.

BACK TO THE TREES COLLECTION

Questions or comments? Send us an email
© 1995-2013 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Friday, Aug 01, 2003 at 10:43 AM
Access Count Since February 1, 1999: 34903
Microscopes provided exclusively by: