Notes:
This observation is for the larger lichen in center of pic and I think that the other surrounding lichen are a different species. Lobe characteristics: absent of rhizines, sides very rolled almost like tubes, short, smooth.

Images

Proposed Names

-57% (1)
Used references: Lichens of North America
-57% (1)
Used references: Suggested species on iNaturalist and appears to fit description: small radiating thalli, strongly convex marginal lobes, central thallus w/ numerous apothecia, abrupt margins, yellowish orange thalli(mine not so yellowish)
92% (2)
Recognized by sight

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Comments

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Thanks for your insight Jason:)
By: Cindy Trubovitz (Trubo)
2018-11-14 21:07:15 CST (-0500)

I just started looking at lichen this past summer so my instinct will take awhile to develop, Ha.

Just a few comments
By: Jason Hollinger (jason)
2018-11-14 19:35:45 CST (-0500)

The webby white is the medulla revealed because, as you say, it was hard to remove and was apparently strongly attached over much of the lower surface.

But do keep in mind that these are just general guidelines. Lichens don’t really pay attention to whether they are dutifully staying completely corticate below, or that they are obeying all the taxonomic rules we try to impose upon them! I feel like lichens are, in fact, a bit worse than plants, birds and other life forms in that regard. You really need to see a fair range of variation of all the similar species before you can comfortably interpret the (over)simplified taxonomic characters used to define our concepts of these species.

In this case my instinct says that this is definitely Xanthoria elegans. I find that if I think too much about it and second guess myself I’ll get all tied in knots over the simplest specimens. So let’s just leave it at that! :) Obviously, I could be wrong, and may even change my mind if I had a specimen in hand.

(For whatever it’s worth, there is quite a lot of visible lower cortex on some of those lobes. And also note that some Caloplaca like C. trachyphylla on sandstone will grow completely free of the substrate. I just recommend caution placing too much emphasis on that one character.)

Thanks Jason,
By: Cindy Trubovitz (Trubo)
2018-11-14 15:26:59 CST (-0500)

I was struggling to determine if this had a lower cortex or not (w/out looking under the microscope) but it was rather hard to remove it from the rock so went with Caloplaca. But I see now that the lobes are somewhat overlapping and perhaps water would have helped with the removal too. I added a photo of the underside where one can vaguely see white web material under the lobes that appears to belong to the lichen(?)

Definitely looks foliose to me
By: Jason Hollinger (jason)
2018-11-12 09:44:27 CST (-0500)

Don’t worry too much about the lack of rhizines, that’s not atypical of X. elegans, at least not the material I’m used to from southwestern USA.

The background species is going to be C. saxicola most likely.