Observation 87530: Caloplaca sideritis (Tuck.) Zahlbr.
When: 2011-09-02
No herbarium specimen

Proposed Names

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Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Definitely!
By: Jason Hollinger (jason)
2012-02-08 03:42:45 CST (-0500)

Worst lighting in the world is a bright day with cloudless blue sky, trying to take photos of things in the shade of a cliff or tree. Just try to get your photos not to look blue! Then if there’s sun reflecting off of yellow rock somewhere else nearby… just forget about it.

Like doing it after rain.
By: Andrew Khitsun (Andrew)
2012-02-07 21:43:16 CST (-0500)

That’s another reason I like doing it right after rain. The colors are naturally rich, so I can get decent ones even in darker situation that usually mutes them. Also, there are often lingering clouds, providing the best lighting, as far as I’m concerned. The oddest photos colorwise are when I try to play with blocking the sun etc. Both this observation and the other one mentioned here look like they’be been done during moderately cloudy weather and not with “Vivid” setting.

Agreed.
By: Jason Hollinger (jason)
2012-02-07 21:30:22 CST (-0500)

Getting colors right is very difficult, I’m right there with you. Playback screen isn’t always reliable, either, not sure why. Maybe something to do with our eyes being adjusted to ambient light.

C.sideritis in Thomson
By: Andrew Khitsun (Andrew)
2012-02-07 21:22:42 CST (-0500)

Yes, that’s his description.
No, I don’t see black rims at all. I’d say in this observation they’re “disappearing”, and in the other one they’re gray.
Also, the difference in colors between this one and the other one could be due to the color settings of my camera. I was shooting in “vivid” for some time, which produces too juicy colors, sometimes unrealisticly. I switched down to “positive”, which I think is more real color. When it’s too dark, I have to switch to “nighttime”, which pales the colors big time. Often, I can’t see the colors well right away on the small screen due to my limited colors perception. I try to compensate when processing photos on computer, but it still leaves a bit odd colors sometimes. Sigh…

That’s Thomson’s description of sideritis?
By: Jason Hollinger (jason)
2012-02-07 20:36:44 CST (-0500)

Do you see black rims? I was interpreting them as pale. If they are black, then it opens a whole other set of species with “thalloidma green”, a weird black pigment that’s K+ violet and N+ violet (I think “N” is nitric acid).

Lichens of WI by Thomson
By: Andrew Khitsun (Andrew)
2012-02-07 20:12:50 CST (-0500)

has this description:
“Thallus of scaly or convex areoles or warts, blackish gray or ashy. Apothecia to 1mm wide, immersed or adnate, flat to convex, yellow rusty or rust brown to black; margin of same color as thallus, blackish gray or gray, sometimes disappearing …”
It seems to fit the bill here in this observation, but the other observation mentioned here has brown thallus, you’re right. Maybe it’s something else from this group? I see people referring to “sideritis group” Those red and black apothecia seem to be a clue too.

Okay, this is far too common
By: Jason Hollinger (jason)
2012-02-07 19:33:12 CST (-0500)

…to be a parasite. One of my assumptions must be wrong. Either this brown/tan thallus is actually K+r despite the apparent lack of anthraquinones (orange pigments), or this is considered “gray”, not brown.

If “gray”, then Wetmore 1996 keys it out fairly clearly to C. sideritis, which CNALH confirms is common throughout the midwest. Not many photos on-line, though. (Yours would be by far the finest photos, if this is in fact what it is!)

If “orange”, then… (using Bruce Ryan’s keys)

C. rimosa? (thin smooth buff thallus)
C. weberiana? (thicker nonsquamulose light-buff thallus)
C. modesta? …

Problem is, I can’t find any of these on-line: CNALH doesn’t know them, and there are no images.

It would surely help if we knew whether the thallus reacted K+ deep wine/red or K+ reddish, or entirely K-.

Similar to #87292?
By: Andrew Khitsun (Andrew)
2012-02-07 18:59:50 CST (-0500)

I think this one is similar to the observation 87292 .

Created: 2012-02-07 18:54:41 CST (-0500)
Last modified: 2016-01-17 21:42:04 CST (-0500)
Viewed: 70 times, last viewed: 2016-07-09 15:02:14 CDT (-0400)
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