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When: 2016-06-11

Collection location: Mata do Bussaco, Aveiro, Portugal [Click for map]

Who: zaca

No specimen available

I didn’t knew the precise location of the specimen in observation 210777, only had an idea; Thus it took me some time to see it again (7th photo taken in loco). The apothecia, which are bright red as the photos show, are of litle help while searching, due to the size; One can only see its color when you are very close to it. Anyway, I could observe it again and more half a dozen of specimens, all living at the same Quercus tree most of them close to the base (see the last photo taken in loco). Naturally, this time I took a sample to analyze under the microscope.

If in observation 210777 Haematomma sorediatum was “Promising”, now after the microscopy “I’d Call it That”. In fact, all the features fit in perfection to the description given in the British Flora. After making the photo sets from the microscopy I noticed that there are two points not very well illustrated and that deserve to be mentioned:
- The apothecia contained many big hyaline crystals, not disolving on KOH, that were present in the slide; they are barely visible in the photos (see the one with the mount in congo red);
- Analogously, the KOH reaction is not very well represented in the attached photos: there was a clear bluish-violet reaction (light tones) fading with time; that reaction caused like a cloud around the apothecium.
Maybe I will return to the microscopy to get better photos illustrating these features.


This was the specimen considered at observation 210777.
The host oak tree (seems Quercus pyrenaica);
Microscopy: Apothecial section, its close ups and some spores;
Microscopy: Hymenium in water (top) and in phoxine;
Microscopy: Hymenium in water;
Microscopy: Hymenium in congo red;
Microscopy: Spores (in water).
Microscopy-New photos: The arrows point to some of the crystals present in the hymenium;
Microscopy-New photos: A section and its reaction to KOH: there is a transient bluish-violet coloration, quickly desappearing;
Microscopy-New photos: The IKI reaction on hymenium.

Proposed Names

87% (1)
Used references: British Flora
Based on microscopic features
Based on chemical features: Soralia K+ pale yellow.

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= Observer’s choice
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Add Comment
Microscopy – New photos added
By: zaca
2016-07-22 15:01:05 MDT (-0600)

trying to overcome the shortcomings mentioned in the notes.

Awesome spores
By: J-Dar
2016-06-25 14:20:37 MDT (-0600)