|I’d Call It That||3.0||5.42||1||(jason)|
sum(score * weight) /
(total weight + 1)
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.
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: 19 times, last viewed: 2017-06-13 12:08:54 CDT (-0400)