When: 2014-05-24

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

Who: zaca

No specimen available

[See the Notes of observation 166163]
Some features of this specimen:
- Grow on the bark of a tree (maybe chestnut);
- Thallus granular, cracked, grey-green;
- Apothecia disperse, with different sizes (up to 1 mm); Disc yellow-orangish with margin either more light yellow or excluded;
- Epithecium, hypothecium and proper exciple brown coloured, sometimes an algar layer is present below the hypothecium; Hymenyum from hialine to light coloured;
- Ascospores with average dimensions: Me = 13 × 7.3 um ; Qe = 1.8; Septum with 1/3 or more than the lenght of the ascospore.


Reaction to K on thallus and on apothecia;
Microscopy 1: Apothecial sections;
Microscopy 2: Asci and spores.

Proposed Names

87% (1)
Used references: Ref. 1 (British Flora):Smith et al., The Lichens of Great Britain and Ireland, British Lichen Society, 2nd edition, 2009; Ref. 2: Ulf ARUP, The Caloplaca holocarpa group in the Nordic countries, except Iceland, The Lichenologist 41(02):111-130, 2009.
Based on microscopic features
Based on chemical features
29% (1)
Recognized by sight

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Add Comment
Note on classification.
By: zaca
2014-05-30 20:20:24 EDT (-0400)

Let me thank Jason again for sending me the paper that constitutes Ref. 2 of this observation.
This paper intents to clarify the Caloplaca holocarpa group in northern Europe. Concerning this observation, the conclusion of that paper is that many of the former specimens denominated C. holocarpa when growing on bark (as here) must be called C. oasis or C. pyracea, while the polymorphism of _C. holocarpa is recognized as capable to grow in many different substrata. The differences are minimal and difficult to measure without adequate equipment. Some photos are also included and particularly one of C. pyracea is very similar to my specimen. Therefore, I propose to it the classification of C. holocarpa group, leaving as possibilities C. holocarpa and C. pyracea.