Observation 104519: Parmelia sulcata Taylor
When: 2012-07-15
No herbarium specimen

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I’ve had problems finding squarrose rhizines on eastern P. sulcata, too
By: Jason Hollinger (jason)
2012-08-10 01:49:26 CDT (-0400)

It’s worth at least considering the (highly unlikely) possibility that this is P. barrenoae — a (mostly western) version of P. sulcata with forking or simple rhizines, instead of squarrose rhizines. The weak K+r does sound unusual, but probably isn’t a game-breaker. My read is that whatever environmental conditions are causing the predominantly simple rhizines is also responsible for the unusually low concentration of salazinic acid.

Just another P.sulcata?
By: Andrew Khitsun (Andrew)
2012-08-09 12:49:29 CDT (-0400)

I have some issues with ID: the rhizines are not squarrose where I can see them, and heavily matted in the center of thallus – superhard to distinguish one from another. But I think young rhiznes are not supposed to be squarrose on this species. The other “problem” – medula turning red with K+, not blood red as it’s supposed to, but that’s subjective. The bottom line is – I just wanted to put this nice specimen on MO :-)

Created: 2012-08-09 12:39:43 CDT (-0400)
Last modified: 2012-08-10 01:46:19 CDT (-0400)
Viewed: 18 times, last viewed: 2016-01-22 23:21:46 CST (-0500)
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