Observation 112005: Caloplaca arenaria (Pers.) Müll. Arg.
When: 2012-10-02
No herbarium specimen

Notes: on Si rock

thought the lichen community here was beautiful

Proposed Names

83% (1)
Eye3 Eyes3
Recognized by sight: worked up some C. arenaria before – I’ll enter that as an observation
Used references: Wetmore, C. M. in Nash III, T.H., Gries, C. and Bungartzk, F. (ads) (2007) Lichen Flora of the Greater Sonoran Desert Region, Volume 3; Smith, C.W., Aptroot, A., Coppins, B.J., Fletcher, A., Gilbert, O.L., James, P.W. and Wolseley, P.A. (2009) The Lichens of Great Britain and Ireland; Brodo, Irwin M., Sharnoff, Sylvia Duran and Sharnoff, Stephen (2001) Lichens of North America

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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thanks…
By: Richard Droker (wanderflechten)
2012-10-06 19:03:57 CDT (-0400)

Thanks, your remarks are always quite valuable to me, so I don’t intend to ignore them. The C. arenaria photos on Ways of Enlichenment certainly look very different. I’ll work up my specimen and get back to you.

Sorry, I must’ve been in a hurry…
By: Jason Hollinger (jason)
2012-10-06 01:39:28 CDT (-0400)

My experience is that C. arenaria is quite red, not orange. Wetmore (2007 in Sonoran Flora vol. III) calls it “dark reddish orange”, and he emphasizes the red in other papers, as well (e.g. when comparing it with C. sideritis in Wetmore 1996). Bruce Ryan calls it “red-brown to orange-red” (and he explicitly mentions that the apothecia are “scattered to crowded”, so my observation that southern California specimens are generally scattered probably doesn’t mean anything).

There are no good comprehensive treatments of the genus in North America. I have no papers specifically dealing with this group (endolithic species). So I think you’re right in using McCune’s compilation. It’s probably the best thing going for the northwest.

I’m just expressing some reservations based on the color. I totally get that color is subjective at best, and monitors differ, and white-balancing is a pain, and all that. No argument there! But try comparing on-line photos on the same monitor, that will cancel out most of the variation. Stridval’s photos look most like what I’m used to seeing in so. Cal. But I see quite a few crowded orange versions, as well. See Curtis Björk’s photo on waysofenlichenment, for example — just like yours. (How embarassing! Never even thought to check my own website! :)

I’m obviously hardly an expert (ha!)… But do Curtis’s and my photos look like the same species to you?? Considering how subtly “they” discriminate between species in other groups of the genus, it really leaves me scratching my head…

Still, my misgivings aside, it looks like there are plenty of other lichenologists who would call yours C. arenaria, too. So try to ignore me…

new image…
By: Richard Droker (wanderflechten)
2012-10-05 14:01:21 CDT (-0400)

Thanks Jason. I should have spent more time on this one. The 1st image is clearly much too intensely reddish when compared to the specimen as it now appears. (It may have been somewhat hydrated when 1st photographed, which would have made for greater color intensity.) (Also must admit that I haven’t continued resetting the white balance as you once suggested, but keep it on auto.) I’ve added a 2nd version of the image for which I’ve tried to match its color to the specimen. (Note that my perception of red is poor.) However, it will appear differently on a different monitor. (My monitor has recently been calibrated.)

I’ll do the microscopy and report back on spores etc. My best reference has been McCune’s “Caloplaca in Pacific Northwest” key at http://people.oregonstate.edu/~mccuneb/Caloplaca.pdf For this one I’m looking at p. 18 #33a through p.19 #42b. I’d appreciate any references you might suggest.

This looks oranger than usual
By: Jason Hollinger (jason)
2012-10-02 15:03:24 CDT (-0400)

And maybe too clustered, too? Hmmm, what about C. holocarpa… wait, they think that doesn’t actually occur in N. Amer. any more, what about this other thing, C. vitellinula — never heard of it, but maybe that’s what saxicolous C. holocarpa is called in PNW these days? Anyway, just a thought…

Created: 2012-10-02 14:32:54 CDT (-0400)
Last modified: 2012-10-02 14:32:58 CDT (-0400)
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