Observation 173801: Lecanora Ach.
When: 2014-08-03
Who: zaca
No herbarium specimen

Notes: Vaguely resembles Dimelaena, the thallus being more squamulose than areolate.

Images

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Photo 1
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Photo 1 – closeup
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Photo 2
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Photo 2 – close up
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Photo 3 (2014-08-23)- specimen with an apothecium
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Photo 4 (2014-08-23) – Several other sterile specimens
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Photo 5 (2014-08-23) – Chemical reactions on thallus of two specimens
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Photo 6 (2014-08-23) – Habitat of most of the specimens: granitic rock
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Photo 7 (2014-08-23) – Together with a specimen of Rhizocarpon geographicum group, also frequent at this place

Proposed Names

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Recognized by sight
58% (1)
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Comments

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Thank you for circling the apothecium!
By: Jason Hollinger (jason)
2014-08-25 09:44:15 CEST (+0200)

But yes, it proves that it belongs to that group, I guess. I wonder why it doesn’t like fruiting??

NEW DATA ADDED
By: zaca
2014-08-24 23:45:26 CEST (+0200)

I went back to the place of this observation, take new pictures to several other specimens and make the spot tests. There are no big news, but it seems that the intuition of Jason was correct: one of the specimens observed has (just) one apothecium of lecanora type, red coloured with a white rim (see Photo 3, right bottom part, marked with a circle). It seems that older specimens tend to crack the thallus and a black prothallus that become visible between the cracks. The chemical reactions are not conclusive.

Sure …
By: zaca
2014-08-13 22:40:17 CEST (+0200)

you are right about the complexity of this group (including the possibility of undescribed species) as well as about the terminology: “placodioid” is a much better term.

Yes, it sure doesn’t looke like L. muralis s. str.
By: Jason Hollinger (jason)
2014-08-13 22:30:02 CEST (+0200)

But that’s a complex group. Probably many undescribed species.

Also, forgive me for being picky, but I wouldn’t call it “squamulose” (thallus composed of ~round, separate, overlapping pieces), rather “placodioid” or “lobate” (the pieces of thallus at the margin are very elongate, branched and ~all connected). “Squamulose” is often misused in literature.

It is a possibility …
By: zaca
2014-08-13 22:11:10 CEST (+0200)

that I didn´t consider, because fully developed specimens of L. muralis observed here are fertile. On the other hand, the lobes (like squamules) are very small.

Could it be Lecanora muralis group?
By: Jason Hollinger (jason)
2014-08-13 21:46:56 CEST (+0200)

But not a single apothecium to be found… What gorgeous specimens!

Created: 2014-08-13 17:57:09 CEST (+0200)
Last modified: 2014-08-25 14:50:21 CEST (+0200)
Viewed: 47 times, last viewed: 2016-10-23 05:22:23 CEST (+0200)
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