Observation 20522: Melanelixia subaurifera (Nyl.) Blanco et al.
When: 2009-04-23
No herbarium specimen

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Two possibilities
By: Jason Hollinger (jason)
2009-04-25 00:23:51 CDT (-0400)

There are only two possibilities on further reflection:

1) Melanelia subaurifera (common in your area in nutrient-rich sites) — surface mostly dull, bumps are mostly or entirely roughened or eroded-looking (sorediate or, as Trevor Goward calls it, “sorsidiate” — intermediate between isidia and soredia); medulla KC+ red (see below)

2) M. elegantula (common farther south) - surface mostly shiny, bumps all shiny and corticate, not eroding (isidia); medulla KC

The spot test should be reliable in this case: scratch off the surface to expose a patch of white medulla; place a drop of lye (K) on it with a toothpick, for example; then a drop of bleach ©. Positive reaction (lecanoric acid in this case) would be a brief but distinct red stain (fading in a few seconds).

Created: 2009-04-23 16:35:25 CDT (-0400)
Last modified: 2009-04-23 16:35:25 CDT (-0400)
Viewed: 40 times, last viewed: 2016-10-22 01:21:07 CDT (-0400)
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