Observation 215225: Buellia erubescens Arnold
When: 2014-04-12
Who: zaca
No herbarium specimen

Notes: See observation 215216.

Proposed Names

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Recognized by sight
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Used references: British Flora
Based on microscopic features
Based on chemical features

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Microscopy added; Buellia erubescens promising …
By: zaca
2015-09-06 07:21:36 MST (-0700)

The spot tests made in loco show a K+ yellow to reddish reaction followed by a KC+ red rection. Now, I analyzed a section of the thallus under the microscope and get a similar conclusion, i.e. by adding a drop of KOH there was a progressive
reddening of the thallus that, however, did not ended with the formation of red crystals.
Following the key to Amandinea and Buellia in the British Flora. taking into account that the hymenium is clear (no oil drops)
and the dimensions of the spores obtained:
(12.5) 13.4 – 18.2 (19.2) x (3.4) 5.3 – 7.1 (7.3) µm
Q = (1.8) 2.2 – 2.9 (3.4) ; N = 31; Me = 15.7 × 6.1 µm ; Qe = 2.5,
we end up with either Amandinea punctata or Buellia erubescens. The spores of these two species are similar (slightly bigger in the latter). On the other hand, the chemistry of the former is usually C-, K-, while for the latter is C-, K+ yellow to red. On the other hand, in the description of B. erubescens it is mentioned that there are specimens lacking norstitic acid. I think that in this specimen the concentration of such acid is low, due to the chemistry mentioned at the begining, and that it must be classified as B. erubescens.
Let me also mention that the other observations accompanying this one (observation 215227 and observation 215229, to be updated later) there are two other Buellia-like specimens, which probably are A. punctata.

Created: 2015-09-04 11:52:09 MST (-0700)
Last modified: 2015-09-06 07:22:18 MST (-0700)
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