Notes: on Si rock
thought the lichen community here was beautiful
|User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.|
|I’d Call It That||3.0||4.81||1||(wanderflechten)|
sum(score * weight) /
(total weight + 1)
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.
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…
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.
Created: 2012-10-02 11:32:54 PDT (-0700)
Last modified: 2012-10-02 11:32:58 PDT (-0700)
Viewed: 80 times, last viewed: 2017-02-11 15:29:29 PST (-0800)