Observation 86293: Lichen P. Micheli

When: 2012-01-14

Collection location: Stebbins Cold Canyon Reserve, Solano Co., California, USA [Click for map]

Who: Byrain

No specimen available

Is this even a lichen? It was found in a (Still) dry stream bed where I have found other interesting lichens and is on several rocks. It looks rather featureless, almost like paint, except why would someone paint several rocks in such a place?

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Interesting idea
By: Byrain
2012-01-15 21:12:23 CST (-0500)

I’m going to look into how to prove this a mineral or otherwise, thanks for the help.

These new photos are better quality
By: Jason Hollinger (jason)
2012-01-15 21:07:17 CST (-0500)

I think we’re looking at something mineral here. You can easily prove me wrong, I’m sure! But given the total lack of features, chemistry, algae, etc. I’m forced to conclude it’s not alive.

By: Byrain
2012-01-15 17:38:10 CST (-0500)

I added some pictures with chemistry, this time I tried to apply it with q-tips to limit the amount of reagent, but I am not sure I got much of a reaction. I also added an image a few minutes after water has been applied hoping it might make some features swell, but still looks rather featureless.

What else can live on bare rock??
By: Jason Hollinger (jason)
2012-01-14 23:44:59 CST (-0500)

Although, there is a bizarre black paint-like unlichenized fungus called Lichenothelia that has the exact same habit. Heaven alone knows what it derives nutrients from!

If you can find soredia in little clumps close-up, then it might be Phlyctis petraea, but I can’t see any obvious features in your photos. Oh, hey, did you try doing a K or C test?

Created: 2012-01-14 22:09:54 CST (-0500)
Last modified: 2012-01-15 21:12:43 CST (-0500)
Viewed: 56 times, last viewed: 2017-06-10 08:41:39 CDT (-0400)
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