Observation 52255: Parmotrema tinctorum (Delise ex Nyl.) Hale
When: 2010-08-18
Who: zaca
No herbarium specimen

Proposed Names

29% (1)
Based on chemical features: C-, K+ yellow; KC+ red (flash, after gold)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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It seems …
By: zaca
2011-04-16 16:52:13 PDT (-0700)

… that once again Jason is right and I did not know to correctly interpret the data from this observation. In fact, her comments about the shape and configuration of the lobes seem to me illuminating, and probably today I no longer classify this lichen in the genus Parmelina.

I missed this observation earlier
By: Jason Hollinger (jason)
2011-04-15 19:21:58 PDT (-0700)

I don’t think we have Parmelina here. These broad rounded lobes and “ruffled” habit suggest Parmotrema to me. Chemically, Parmotrema tinctorum is identical to Parmelina (both have lecanoric in medulla and atranorin in cortex: medulla K-, C+r, KC+r; cortex K+y, C-, KC-). But look again at the photoyou linked to from irishlichens.ie. See how flat the thallus is (especially upper photo)? And notice the “looping” axils (hard one to describe, sorry!) between crenulate lobe tips (almost like stubby fingers around the margin). This Parmotrema has broad, rounded lobes, overlapping a bit, and the axils between the lobes are closed tight and almost invisible. Amd the interior is all rumpled up instead of flat.

If you’re willing to grant me Parmotrema instead of Parmelina :)… The features I’m looking at to arrive at Parmotrema tinctorum out of hundreds of species world-wide (there’s a nice working key here: http://www.bgbm.org/sipman/keys/Neoparmo.htm) are:

  • relatively flat (compared to other Parmotrema!) broad lobes
  • pale smooth uncracked unmottled gray
  • apparently no cilia (this can fool you sometimes though, e.g. P. dilatatum!)
  • abundant tiny little isidia covering the entire surface toward the center of the thallus, but not near the lobe tips

Chemistry distinguishes P. tinctorum from the (barely) ciliate P. ultralucens: former is C+r KC+r (seen through cortex in photo); latter is K+r, C-, KC- (and UV+y in faint yellowish pigment on lower edge of medulla).

Created: 2010-09-07 16:08:08 PDT (-0700)
Last modified: 2011-04-16 16:51:11 PDT (-0700)
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