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Image: This is an image of a cross-section of a stem and seven small leaves (microphylls) from an Australian Beefwood <I>(Casuarina cunninghamiana)</I>. A special Ultraviolet (UV) light was used to reveal the different colors under a microscope. Items under a UV-lamp fluoresce and do not look the same color as under daylight. The red fluorescence in the very small pentagon shaped leaves is from chlorophyll. The blue fluorescence is from secondary metabolites in the vascular (central) and epidermal (outer) tissue.<BR> <BR> This beefwood appears to have needles when looking with the unaided eye, which are not found in this taxonomic group. Investigating with a UV microscope revealed that instead of a single needle this is a stem with seven small leaves. Not everything is as it appears to the human eye.<BR> <BR> <font color=#DC143C><B><U>Restrictions for Use of this Image:</U></B></font>Arizona State University (ASU) has allowed the NSF to include this image in the NSF Image Library. ASU encourages the use of this image as well as other material from the ASU Ask a Biologist website. Distribution of this image is permitted under the following rules:<BR> <BR> -Material is <I>not</I> used for commercial or for-profit purposes.<BR> -Credit for the material is clearly displayed, including copyright and author.<BR> -Modifications are not made to the original material.<BR> -Ask a Biologist and/or individual authors retain the copyright for this image.<BR> -The user agrees to record their use of the image (or other material) via the ASU Ask a Biologist permission form located at <a href=http://askabiologist.asu.edu/pages/permissions.html; or by contacting CJ Kazilek at kazilek@asu.edu. Thumbnail">

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Last Modified: Jan 31, 2001