365Caws is now in its 14th year of publication, and was originally intended to end after 365 days. It has sometimes been difficult for me to find new material, particularly during the winter months, but now as I enter my own twilight years, I cannot guarantee that I will be able to provide daily posts. It is my hope that along the way I may have inspired someone to a greater curiosity about the natural world. If so, I can rest, content in the knowledge that my work here has been done.
Friday, December 13, 2019
Tremella Mesenterica On Hardwood
Day 61: Natural history lesson for the day: it is often helpful to identify the substrate on which a lichen or fungus is growing. Some species prefer hardwoods to soft, as is the case with Tremella mesenterica, commonly known as Witches' Butter. It has a close look-alike in Dacrymyces palmatus which, conveniently, exhibits a preference for softwood such as Doug-fir. When the wood on which the fungus grows is too badly decayed to sort out, we must resort to microscopic examination of the spore-producing basidia. Both Tremella and Dacrymyces are common in the Pacific Northwest. While identification of the substrate isn't a foolproof way of separating them because Dacrymyces also occasionally occurs on hardwood, if you observe an orangy-yellow jelly fungus similar to the one shown in this image and it is growing on rotting alder, it is undoubtedly Tremella mesenterica.
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