Observation 23401: Melanelia

When: 2009-07-21

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

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Lichen in question is near the center of the photo, greenish- to dull brown, with white edges and some white or at least lighter-colored ridges on the surface. Found on a 50-year-old rhododendron in front of my home.

Proposed Names

34% (2)
Recognized by sight
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You can improve the odds of an ID with a hand lens
By: Jason Hollinger (jason)
2009-07-21 20:23:07 PDT (-0700)

Each group is a little different, but there are a few things that to look for with a hand lens that are applicable to almost all foliose genera:

soredia – Is any part disintegrating into powder or granules, sometimes creating neat little mounds or lines, sometimes irregular or diffuse patches?

isidia – Are there minute wart-like, finger-like, or ball-like outgrowths, either along the margin, or in patches or diffuse on the surface?

pruina – Are the lobe tips, thallus surface, or apothecial disks covered in whitish powder?

hairs – Sometimes hairs or tomentum are so small or faint that they can only be seen with hand lens. Especially check new growth at lobe tips.

In other genera it can also be very helpful to examine the rhizines on the undersurface with a hand lens, to see if they are discrete, tufted, branched, fuzzy, etc. Especially helpful for the Physciaceae.

Created: 2009-07-21 18:04:43 PDT (-0700)
Last modified: 2009-07-21 18:04:43 PDT (-0700)
Viewed: 25 times, last viewed: 2017-06-05 22:53:10 PDT (-0700)
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