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When: 2008-10-09

Collection location: Southeast Portland, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Took a voucher collection of this lichen, found on ornamental pear tree at a local McDonald’s. Surface of lichen sea-green, or light blue-green, with pine-green edges which are knobbly (may be spore-bearing?). Back of lichen is mostly granulose dull black, but with many grayish-white rhizimes or root-like structures. Photos taken in the palm of my hand. Total collection about 3/4 inch across at widest point.


Proposed Names

5% (2)
Recognized by sight
56% (1)
Recognized by sight: Either Physcia or Physconia; former is usually pale underneath; assuming the latter, then the strictly marginal soredia (knobbly stuff) indicate this species, which is supposed to be common throughout this area.

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= Observer’s choice
= Current consensus


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