When: 2015-12-07

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

35.8237°N 120.2906°W 462m [Click for map]

Who: J-Dar

Specimen available

On bark of Tree of Heaven (Ailanthus altissima) tree at an old homestead site. This was a commonly planted tree in this semi-arid environment in the early and mid 20th century as it required little water.

Thallus white, thin, without prothallus, K+Y, C-. Apothecia grey, heavily pruinose, about 0.5mm, disk C+Yish. Hymenium hyaline. Epihymenium brown, clearing in K. Paraphyses unbranched.

Spores hyaline, ellipsoid, simple. 12.7×5.4µm (one spore measured).


Proposed Names

76% (2)
Recognized by sight

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Add Comment
Sorry, should have voted
By: Jason Hollinger (jason)
2017-07-07 19:17:33 PDT (-0700)

Yes, this is a dead match for L. carpinea. Very distinctive species, I think.

Too much bleach makes sniffers bad!
By: J-Dar
2017-07-07 19:11:00 PDT (-0700)

I know a museum vertebrate curator in his 60’s who lost his sense of smell many years ago due to preservation chemicals.

You think this is likely carpinea? It isn’t albella or caesiorubella, and there aren’t that many densely white pruinose species with K+Y thallus (that at least was very strong).

Yes, the L. carpinea C test is as strong as they come!
By: Jason Hollinger (jason)
2017-07-07 19:03:36 PDT (-0700)

Definitely ditch that bleach.

My latest rule of thumb is if you apply C under the coverslip you should see bubbles. Not exactly “vigorous” but healthy and active bubbles.

The smell test is useless for me. Some days it’s overwhelming, then other days brand new bleach seems odorless. Not sure why my sniffer is so variable.

Related to other observations…
By: J-Dar
2017-07-07 18:48:38 PDT (-0700)

First, the photos and micro data are from a session I did last fall and I don’t have any micro photos to demonstrate the features. Second, the C test notes I have say C+Y, and I can see some orange marking on a couple of the apothecia where I tested. I re-tested C last night and got nothing, but I seriously think its time to change out the bleach in my bottle. But I thought that was interesting, because I consider Lecanora carpinea as strongly C+Y so i figured it would register somewhat.

This specimen was collected the same day and at the same location/substrate as two other Lecanora observations: observation 280873 and observation 224870. I think this is the same species as the former observation, which represents a damaged specimen. I’ll update those with more info.

Created: 2017-07-07 18:40:41 PDT (-0700)
Last modified: 2017-07-07 19:29:56 PDT (-0700)
Viewed: 26 times, last viewed: 2019-08-20 10:34:52 PDT (-0700)
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