Observation 202407: Graphis Adans.

When: 2015-04-03

Collection location: Serra de Montejunto, Portugal [Click for map]

Who: zaca

No specimen available

Growing on the bark of a young chestnut.

References used in all the observations of the genus Graphis:
Ref. 1 – [Graphis Key] – R. Lucking, A. W. Archer, A. Aptroot : A world-wide key to the genus Graphis (Ostropales: Graphidaceae), The Lichenologist 41 (4): 363-452, 2009.

Ref. 2 – [Garphis Tax] R. Lucking: The taxonomy of the genus Graphis sensu Staiger (Ascomycota: Ostropales: Graphidaceae), The Lichenologist 41 (4): 319-362, 2009.

Ref. 3 – [Ticolichens] – R. Lücking, J. L. Chaves, H. J. M. Sipman, L. Umaña, A. Aptroot: A first assessment of the Ticolichen biodiversity inventory in Costa Rica: The genus Graphis, with notes on the genus Hemithecium (Ascomycota: Ostropales: Graphidaceae). Fieldiana (Botany),
New Series 46: 1–131 (2008).

Ref. 4 – [G_scripta complex] – G. Neuwirth, A. Aptroot: Recognition of four morphologically distinct species in the Graphis scripta complex in Europe, Herzogia 24 (2): 207–23, , 2011.

Ref. 5 – [British Flora] – Smith et al. (eds.), The Lichens of Great Britain and Ireland, The British Lichen Society, 2nd ed., 2009.


Microscopy: Sections;
Microscopy: Spores;
Comparison of specimens: lirellas;
Comparison of specimens: K reaction on thallus;
Comparison of specimens: Sections (x100);
Comparison of specimens: Sections (x400);
Comparison of specimens: Spores.

Proposed Names

87% (1)
Eye3 Eyes3
Recognized by sight
29% (1)
Recognized by sight: Graphis scripta seems to be an huge aggregate of species. This one clearly is not G. scripta sensu stricto, because it has no pruinose discs. However, is the only species know to exist here with this morphology.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Comparison of specimens in different observations.
By: zaca
2015-04-09 18:54:56 CDT (-0400)

I uploaded several sets of photos with comparison of several features of this specimen with those in observation 202408, observation 202409 and observation 202410. All of them share the following features:

Pigmentation: Absent;
Labia striation: Entire;
Exciple carbonization: Lateral;
Hymenium inspersion: Clear;
Ascospores septation: tranverse.

As a consequence, according to the main reference (Ref.1), they all belong to the same, which is there characterized as follows,

Group 4: Labia entire, excipulum laterally carbonized, hymenium clear, ascospores tranversally septate

The lack of time and the difficulty in interpreting the meaning of some “technicalities” didn’t permit to follow in detail the key for this group. As I expected this group includes the well known (complex of?) species Graphis scripta. It is also clear that only a “superspecies” can have such a wide range of variation both in morphology or in the dimensions of the spores. Hence, I postpone further comments for a forthcoming occasion.

Microscopy added.
By: zaca
2015-04-09 18:30:54 CDT (-0400)

I uploaded already some sets of photos from the microscopy.
Data for the dimensions of the spores for the specimen in this observation:
(34.7) 42.6 – 64.6 (73.8) x (7.2) 7.4 – 8.6 (9.1) µm
Q = (4.7) 5.7 – 7.9 (8.8) ; N = 40
Me = 54.3 × 8 µm ; Qe = 6.8

For a better comparision with specimens in other observations I have used the same scale in all the photos, unless stated otherwise.

Created: 2015-04-07 16:02:18 CDT (-0400)
Last modified: 2015-04-09 18:52:04 CDT (-0400)
Viewed: 52 times, last viewed: 2017-06-20 01:50:52 CDT (-0400)
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