What’s Not to Like About a Lichen
By Alice B. Andrews, Ozark Society Conservation Chair We all enjoy a pleasant walk in the deciduous forests of the Ozarks at any time of the year. In my case, the varied textures and seasonal changes of our oak and hickory forest provide so much more visual interest than the dark spruce-fir forests of Colorado or the lodgepole pine deserts of Yellowstone. One important component of this scenery is the lowly, often overlooked lichen. Lichens inhabit virtually every hard surface in view, be it composed of tree bark, bedrock, or even exposed soil. When we take time to look at individual lichens we are often amazed by the variety of sizes, shapes and colors we see. Lichens figure into historical accounts where desperate and starving arctic explorers like Alexander McKenzie and John Franklin subsisted on the boiled tissue of rubbery lichens they called rock tripe – not the most appetizing but easier to digest than shoe-leather stew. The excruciatingly slow growth of lichen colonies is now used as a measure of elapsed exposure time for surfaces in front of receding glaciers – a science known as lichenometry. The lichen’s intimate partnership between disparate [...]