When: 2014-05-01

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

Notes:
This specimen has a distinctive appearance, due to the thallus coloration and to the pruinosity of the lirellas.
This fact is used was the British Flora in the notes to the description: “Recognized by the yellow-green-olive, waxy thallus and flat, but raised, apothecia with clear, white, powdery margins”. It seems to me that, if this is the standard appearance, there is no problem to take it for another species.
Unfortunately, most of the spores were old and shrivelled. Here are some data from microscopy:
Hymenium tall: ~105 um
Spores dimensions:
(22.6) 24.2 – 28.3 (29) x (6) 6.3 – 7.9 (8) µm
Q = (3.3) 3.32 – 4.1 (4.6) ; N = 24
Me = 26.4 × 7.1 µm ; Qe = 3.8
Spores septation: 5, some with less.
All the data are also in accordance with Ref. 2.

Images

Close up to observe lirellas;
Chemical reactions;
Microscopy: Apothecial sections;
Microscopy: Spores.

Proposed Names

87% (1)
Recognized by sight
Used references: British Flora: Smith et al. (eds.); the Lichen of Great Britain and Ireland, The British Lichen Society, 2nd ed., 2009.
Ref. 2 – M.E. López de Silanes and J. Álvarez, The genus Phaeographis Mull. Arg. (Graphidaceae, Ascomycotina) in the Iberian Peninsula, Nova Hedwigia 77 (1-2): 147-160, 2003.
Based on microscopic features
Based on chemical features

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= Observer’s choice
= Current consensus

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