Observation 63896: Imshaugia aleurites (Ach.) S.F. Meyer
When: 2011-02-21
No herbarium specimen

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Common in mountains on mountain laurel and pines
By: Jason Hollinger (jason)
2011-02-26 11:20:05 PST (-0800)

Not sure how to best distinguish this from Heterodermia. Imshaugia is completely corticate below (as are a few Heterodermia, but not H. granulifera). I. aleurites has well-developed, true isidia; H. granulifera has soft-corticate round granular “isidia”; I don’t know any other Heterodermia with isidia. Also, Imshaugia is in the Parmeliaceae (versus Heterodermia in the Physciaceae), this means that it has a different kind of cortex that typically looks “shinier” (in Imshaugia, check the lobe tips especially, since it is often “dirty” toward the center, like this specimen). The rhizines may be shorter and “stubbier” in Imshaugia than Heterodermia. Heterodermia usually has brushy or squarrose black rhizines; the few that have simple white rhizines (e.g., H. speciosa) still mostly have long cilia-like rhizines.

Created: 2011-02-26 05:59:59 PST (-0800)
Last modified: 2011-02-26 11:06:50 PST (-0800)
Viewed: 17 times, last viewed: 2016-03-29 15:27:32 PDT (-0700)
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