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Observation 11642: Parmelia sulcata Taylor

When: 2008-09-27

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

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Growing on a decorative branch in my front yard. Resupinate lichen becoming somewhat elevated near the edges. Largest specimen in photo is perhaps 3cm across, most are much smaller. Grayish-green to nearly silver color in full sunlight, these were ‘hiding’ on the shaded side of the branch.


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Parmelia sulcata
By: Jason Hollinger (jason)
2008-09-27 19:55:04 CDT (-0500)

… probably. These are young (or maybe it’s because they were growing in the shade), so they don’t show any soredia or isidia yet, which you’d need to see to be absolutely sure. But P. sulcata is very common. Incidentally, this is another fun one to tear open and pour a drop of bleach on — you get a very satisfying if fleeting reaction. Best to use an eye-dropper or toothpick or something, because the interior of lichens is very hydrphobic, so it can take some work to convince the bleach to actually touch the hyphae.