Observation 215882: Buellia halonia (Ach.) Tuck.
When: 2015-08-28
(38.7255° -123.4801° 0m)
Who: J-Dar
No herbarium specimen

Notes: On large bedrock in the spray zone just up from the intertidal.

Thallus areolate, yellowish, areoles tightly packed to dispersed, prothallus absent, C+Orange.
Ascospores 1-septate, seemingly brownish, not hyaline, ellipsoid, not curved or constricted.

I took it to Buellia halonia in the keys. Possible for habitat and region, but not very confident for some reason.

Caloplaca coralloides nearby (observation 215788).


A rather thick apothecium section
Septate spores (disregard reddish coloration, I think saturation was set high on the program, but it was likely brownish)

Proposed Names

-56% (1)
Recognized by sight
28% (1)
Recognized by sight
56% (1)
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Recognized by sight

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Add Comment
By: J-Dar
2015-10-17 05:16:17 EEST (+0300)

Thanks for the feedback, this new compound scope is opening up a whole new world of crust-keying, a sadistically fun practice.

Buellia is certain
By: Jason Hollinger (jason)
2015-10-17 04:10:46 EEST (+0300)

Give the rarity of C+ orange maritime species — only two choices on rock in the Sonoran Flora! — I’d go even further to say this is almost certainly B. halonia as you suggest.

Brown septate spores are distinctive, mostly confined to Physciaceae. The only other genera I would even consider are the mazaediate ones — Thelomma, Cyphelium — but your apothecial section (once I noticed it!) clearly rules them out. Mazaedia would have a huge mass of spores and disintegrating asci obscuring the section completely.

So Buellia likely?
By: J-Dar
2015-10-17 03:48:04 EEST (+0300)

I was pretty sure the hymenium was showing a very light change to violet with K addition under slide cover.

The only two points that seem to give pause
By: Jason Hollinger (jason)
2015-10-17 02:51:13 EEST (+0300)

are the lack of black prothallus and the color of the epihymenium. I wouldn’t worry too much about either. These don’t seem to be reliable characters in Buellia.

Specimen found…
By: J-Dar
2015-10-17 01:13:03 EEST (+0300)

Looks like I actually did grab a section of crumbling rock with this observation. I found it hard to tell spore coloration, but it seemed like it was brownish instead of hyaline.

That’s what I figured
By: J-Dar
2015-09-11 21:00:16 EEST (+0300)

I posted it just to see if anyone recognized it from intertidal zone, but I didn’t collect it or get any additional info. An unfortunate “lichen” ID in perpetuity probably…

Impossible to say something concrete for
By: zaca
2015-09-11 20:41:39 EEST (+0300)

this type of crustose lichen only from a photo, apart from the usual candidates: Lecidea, Porpidia and several dozens of close or related genera.

Created: 2015-09-11 05:59:10 EEST (+0300)
Last modified: 2015-10-17 05:18:58 EEST (+0300)
Viewed: 54 times, last viewed: 2017-02-19 18:21:58 EET (+0200)
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