Observation 74358: Lichen P. Micheli

When: 2011-08-20

Collection location: Sacramento, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on a rock placed at a corner of a busy intersection. The chemical reactions were faint, but maybe they’re still of some use.



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Thanks Jason
By: Byrain
2011-08-21 15:14:00 CDT (-0400)

That was some very useful informaton. I’ll try that, but will have no time for it soon, but I’ll get to it eventually. :)

By: Jason Hollinger (jason)
2011-08-21 14:41:41 CDT (-0400)

Isidiate Xanthoparmelia that look like this always are, very boring after a while, in fact. But to be sure, you need to do the NaOH test on the medulla. Scrape away the cortex until you expose the white cottony interior, then repeat. X. mexicana has salazinic acid, so it should turn yellow instantly and over the next few seconds resolve to a deep dark blood-red. It’s very strong, so even if your NaOH is a weak solution, it should be very noticeable. zaca gets reactions even through the cortex all the time, but I think he must be using particularly strong reagents(?) - nothing at all wrong with that, quite the contrary, but I mention it just to reassure you that it’s not necessarily unusual to get K and C- on the cortex of Xanthoparmelia (it should be KC+ gold, though, that is, if you put a drop of bleach on top of the drop of NaOH, it should turn a nice golden yellow).

Created: 2011-08-21 06:31:32 CDT (-0400)
Last modified: 2011-08-21 14:42:35 CDT (-0400)
Viewed: 36 times, last viewed: 2017-06-09 20:29:06 CDT (-0400)
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