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Physcia caesia which seems particularly fertile on blacktop in Seattle

  • 01 May 2018 12:16 PM
    Message # 6128354

    Encountered a lichen that to me looked like Physcia phaea. Didn’t expect that on blacktop in Seattle. On closer inspection decided it was P. caesia. In Smith et al.(2009) The Lichens of Great Britain and Ireland, substrates of P. caesia include "asphalt pavements”. Stenroos et al. (editors) 2016 Lichens of Finland mentions "Many records of Physcia phaea have turned out to be either the saxicolous P. alnophila or fertile P. caesia..." Anyway, thought it might be unusual enough to post a photo. (Around here mostly have seen P. caesia on rock near salt water, where its very abundant. Posting photo from last week on Vancouver Island.)

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