Notes: Some of the features of this specimen:
- Growing on the bark of an hardwood tree; Thallus uniform gray;
- lobes small, flat, slightly wavy at the margins;
- no cilia, no isidia and only some lobes have a litle of terminal soredia;
- lower surface uniformly brown with some veins and no rhizines;
- chemistry on medulla: K-, C+ weak red but only at some points , KC+ yellow (weak).
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Depending on concentration they can look quite different. There should always be at least a split-millisecond of pink (or even violet in the case of alectoronic) then it fades to red/rose then eventually golden-yellow like this. How fast it fades depends on concentration.
Also note that P. dilatatum (but not gardneri?) can have varying quantities of usnic acid in the cortex (and medulla?), perhaps speeding the transition to gold? (Although James Lendemer has remarked that he never found usnic acid detectable with spot tests in the group, but that could just be North American material.)
In summary, I would consider the same set of KC+rose species here. I know of no species with gray surface but KC+y medulla (and I don’t see any in Sipman’s key), making that diagnosis suspect (if not actually impossible). (This looks most like rampoddense to me for whatever that’s worth.)
Created: 2011-07-01 10:29:34 PDT (-0700)
Last modified: 2011-07-01 10:29:35 PDT (-0700)
Viewed: 47 times, last viewed: 2016-10-25 17:22:49 PDT (-0700)