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Andrew had a bunch of specimens verified by the North American expert, Esslinger, a month or two ago. Those might be the single best resource to use.
The color of the medulla is barely yellow in some specimens, and yes, I’ve seen specimens which are only yellowish near the cortex. I’ve not been confident about such specimens. These also typically have week and especially ambiguous K and KC tests, too. Be thankful you don’t have the intermediate species, P. leucoleiptes which has yellowish medulla only under the soralia and nowhere else!
I wrote “Whitish medulla”, nothing else, but I know where this comes from. As a matter of fact, if you start to scratch the medulla the yellow appear as a result of removing the cortex, but bellow the color is white. I repeated the exercise with a specimen collect in the same zone and entirely similar, of which I upload a photo and another with the scratching. Please give me your opinion about it.
Created: 2014-08-13 16:48:27 CDT (-0400)
Last modified: 2014-08-14 17:54:44 CDT (-0400)
Viewed: 26 times, last viewed: 2015-11-12 00:12:39 CST (-0500)