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Observation 11641: Melanelia

When: 2008-09-27

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

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Notes:
A green lichen growing on rhododendron ‘Cynthia’ in front of my home in SE Portland. This has small grayish-white rootlike structures not visible in this photos, which appear to penetrate the bark of the rhododendron and anchor the lichen in place. Kind of bumpy in the right top of the photo.

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Melanelia
By: Jason Hollinger (jason)
2008-09-27 19:48:39 CDT (-0500)

Perhaps Melanelia subaurifera? I can’t quite make out the details I need from the photo. It looks like it has granules scattered over the surface. If the granules are powdery, or if they are clumped, or if they are along the margins, or if is smooth (or at most wrinkly or rugose) throughout, then it’s one of dozens of other species.

(It would also help to scrape away the cortex to expose the white interior and put a drop of bleach on it. I’m guessing it will probably momentarily turn red before fading, but this is important in all the keys.)