When: 2014-05-24

Collection location: River Park, Lebanon, Linn Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Thin ribbon-like lichen, on Oregon White oak.


Proposed Names

-47% (2)
Used references: Brodo, Lichens of North America

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= Observer’s choice
= Current consensus


Add Comment
I seriously considered Ramalina
By: Daniel B. Wheeler (Tuberale)
2014-05-27 13:21:08 EDT (-0400)

and talked myself out of it.

Very similar to Evernia
By: Jason Hollinger (jason)
2014-05-27 12:55:13 EDT (-0400)

The biggest difference — and it is very subtle at times! — is that Evernia should be “foliose” versus Ramalina which should be “fruticose”. Meaning Evernia branches should be differently colored on the two sides, Ramalina branches the same. Of course, there are exceptions for both! And particularly fruticose-acting Evernia with lots of ambient light will wind up being just as green on both sides. But generally one side, espescially near the base, is obviously pure white (or tinged brownish).

Another difference which is much more reliable but harder to learn and even harder to describe, is Ramalina (at least the ones you need to worry about in Oregon) is tough and cartilaginous with dense thin ~translucent medulla (if you can find any medulla at all), while Evernia is softer with an obvious loose cottony medulla. This results in a different gestalt which is readable from a distance, but only experience will teach it.

Lastly, just knowing the common species well helps! You can readily see on this specimen the string of long slit-like soralia ~exclusively along the margins of the lobes — this is classic R. subleptocarpha. Evernia prunastri has much more irregular soredia/isidia, usually at least partially on the branch surface not just the edges. And R. farinacea will have more dot-like or disk-like soralia along the margins, not so elongate.

Created: 2014-05-25 01:30:39 EDT (-0400)
Last modified: 2014-05-27 13:18:45 EDT (-0400)
Viewed: 27 times, last viewed: 2019-09-11 12:34:40 EDT (-0400)
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