Observation 217405: Buellia erubescens Arnold
When: 2015-09-26
Who: zaca
No herbarium specimen

Notes: Growing on a branch of a Juniperus shrub at a cliff over the sea.

This observation refers to the lichen with two thalli with apothecia on the first photo. Growing with it there is a fungus with perithecia to be considered at another observation.

This time it is what it seems: a Buellia. Taking into account the chemistry (K+ yellow to red, see the corresponding photo) and the fact that the hymenium is clear (see the attached photos), i.e. has no oil drops (this character is easy to observe for those who are used to make microscopy of species in Phaeographis (all with the hymenium inspersed with oil drops) and others in Graphis (many of which have hymenium clear but also many have hymenium inspersed). Only these characters lead in the key for Amandinea and_Buellia_ in the British Flora to Buellia erubescens. All the rest of the features agree with the description of this species, in particular, the spores are 1-septate, soon brown, with the following dimensions:
(11.4) 12.6 – 15.2 (15.5) x (4.4) 4.6 – 5.8 (5.9) µm
Q = (1.9) 2.2 – 3.2 (3.4) ; N = 21
Me = 13.6 × 5.1 µm ; Qe = 2.7 .
The values for the dimension of the spores a bit below those given in the British Flora (14-20 × 6-9 um). However, for instance, in CNALH the dimension for this species are also lower: (9-)11.3-[13.1]-14.9(-16) x (6.5-)6.7-[7.3]-7.9(-8) µm (n=26) .
Thus, I think this is Buellia erubescens.


Microscopy: Hymenium-2;
Close up of one of the thalli;
Chemical reactions;
Microscopy: Apothecial sections (at the top the same section with two different lightnings; at the bottom a magnification of the section (right) and a section of a not yet fertile apothecia (left);
Microscopy: Hymenium-1;
Microscopy: Asci and spores.

Proposed Names

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Used references: British Flora and CNALH
Based on microscopic features
Based on chemical features

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Created: 2015-10-01 14:06:15 PDT (-0700)
Last modified: 2015-10-01 14:09:42 PDT (-0700)
Viewed: 21 times, last viewed: 2016-10-24 22:42:58 PDT (-0700)
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