Observation 95646: Usnea Dill. ex Adans.

When: 2012-05-25

Collection location: Umptanum Falls, Kittitas Co., Washington, USA [Click for map]

46.896° -120.6298° 801m

Who: nastassja (Nastassja Noell)

Specimen available

Substrate: Attached to trunk of aspen, leaning over creek, on south facing side. Slightly protected from sun and wind.

Habitat: Riparian aspen community, surrounded by sagebrush steppe.

Description: Species uncommon in plot. Difficult to find mature specimen. No soralia seen. Pappillae few.


Copyright © 2012 Jesse Taylor
Copyright © 2012 Jesse Taylor
Copyright © 2012 Jesse Taylor

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Add Comment
:) thanks Jason
By: nastassja (Nastassja Noell)
2012-05-30 20:03:13 PDT (-0700)
I think there are soralia on there
By: Jason Hollinger (jason)
2012-05-27 16:35:35 PDT (-0700)

They look more like scars from tiny side branches breaking off than anything in this case. They are very small, so it rules out species like U. lapponica. Maybe it’s U. glabrescens? Try doing the K, C, KC, CK, UV tests on the medulla. That might help narrow options down.

This is an extremely difficult genus. I personally really like Clerc’s key in the Sonoran Flora vol. III. It’s the only one that has ever “worked” for me. But you’re still going to need to see lots of specimens to get a feel for what is “pendent” and what is “shruby” or “bushy”; what “black” base really means; what a “loose” medulla is (variously also called inflated, hollow, “yielding to a fingernail”). I wrote a little summary for the MO description that you may or may not find useful.

PS. Sorry about the interruption in service you experienced recently. There were only a few users active, so I took the opportunity to take MO down and convert the database encoding, something we’ve been wanting to do forever.

Created: 2012-05-27 16:10:53 PDT (-0700)
Last modified: 2012-05-27 16:13:38 PDT (-0700)
Viewed: 46 times, last viewed: 2017-06-12 23:07:56 PDT (-0700)
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