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It seems that Aslamidium impurum is pretty variable as far as the markings go. The link provided in the ID suggestion is pretty similar, but I also found references to specimens with nearly no markings and others with more. Specimens 2-4 in this illustration, http://www.sil.si.edu/imagegalaxy/imageG... are variations on the same species (Himatidium impurum is an outdated synonym).