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.
Saturday, February 13, 2016
Ochrolechia Laevigata, Smooth Saucer Lichen
Day 123: Superficially very similar to Multicolored Rim Lichen (Lecanora pacifica), Ochrolechia laevigata (Smooth Saucer Lichen) has an even closer look-alike in its cousin O. oregonensis (Double-rim Saucer). Two features distinguish them. The first is less obvious: Double-rim has a second narrow whitish-pink band just inside the outer rim, absent in O. laevigata. Much more telling is the fact that Double-rim grows almost exclusively on conifers, and Smooth Saucer will only be found on alder, vine maple and other deciduous species. The disks of Smooth Saucer seldom exceed 3 mm. Those of Double-rim may be up to 1 mm. larger. Both species respond positively to chemical testing with chlorine.
Labels:
Longmire,
MORA,
Ochrolechia laevigata,
Smooth Saucer Lichen
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