When: 2017-06-13

Collection location: Monterey Co., California, USA [Click for map]

35.8237°N 120.2814°W 480m [Click for map]

Who: J-Dar

Specimen available

On wood boards at an old ranch grain silo


Proposed Names

28% (1)
Recognized by sight
57% (1)
Recognized by sight: Proper margin dominant, no algae in margin, thallus subsquamulose.

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= Observer’s choice
= Current consensus


Add Comment
Hold the presses!
By: Jason Hollinger (jason)
2017-07-15 09:41:55 PDT (-0700)

I just realized what it looks like to me — Caloplaca saxicola! It’s the apothecia. They are immersed and becoming at most broadly adnate, not sessile at all. But… how does that mesh with not having a thalline margin??? Very strange specimen.

Interesting that you have better luck with the margin
By: Jason Hollinger (jason)
2017-07-15 09:39:47 PDT (-0700)

I much prefer below the hymenium. Good thing to remember.

Yeah, I can’t recommend a better name, either. The thallus looks more like C. squamosa than C. subsoluta, but the lack of a conspicuous double-margin seems to rule that out, as you say. I guess it’s not unusual for the areoles of saxicolous crusts to look very different on wood, I shouldn’t be surprised.

Round cells in apothecial margins
By: J-Dar
2017-07-15 08:27:00 PDT (-0700)

I tried with this one to see the cellular structure of the hypothecium but, like you mention, my section was not thin enough. The wood was soft and made it hard to get the blade through the apothecia while it was moving! The Nash key couplet also refers to the margin, whether there are round cells or hyphae. I often look to this character when the hypothecium is unclear. For this one the margin was not that clear either, but seemed closer to round cells. Regardless, going the other way in the key didn’t get me anywhere good.

Paraplectenchymatous hypothecium
By: Jason Hollinger (jason)
2017-07-14 20:57:11 PDT (-0700)

(Or the layer below the hypothecium, depends how you define things!)

This definitely takes practice. Work on getting the absolute thinnest section you possibly can, with a fresh blade. With a thin enough section this character becomes completely obvious. It’s worth the effort. This comes up all the time.

My thought too,
By: J-Dar
2017-06-25 09:47:11 PDT (-0700)

something like Caloplaca subsoluta. I’ll pick away at all these Caloplaca specimens over the next week. Yes, it is punishing! But my box of miscellaneous Caloplaca is getting too large, I can’t let it go any longer…

Might be a saxicolous species
By: Jason Hollinger (jason)
2017-06-25 06:40:36 PDT (-0700)

Created: 2017-06-24 21:11:48 PDT (-0700)
Last modified: 2017-07-14 20:00:35 PDT (-0700)
Viewed: 58 times, last viewed: 2019-08-19 23:21:07 PDT (-0700)
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