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Acrocordia gemmata (Ach.) Massal.

Synonyms:

Family: MONOBLASTIACEAE

Habitat: Ubiquitous

Description

   Thallus crustose, thin, more or less smooth and cracked, white or pale grey, pale grey-green, hypothallus not visible. Perithecia hemispherical more or less immersed in thallus, 0.5-1 mm diam., blackish, one quarter to entirely immersed with an ostiole on top  often eccentric and sometimes papilla-like. Ascii narrowly cylindrical, apical dome with a broad ocular chamber surmounted by a hemispherical meniscus-like structure, 8-spored. Ascospores ellipsoid, 1-septate with a finely granular perispore, 18-30 x 8-12 µm according to literature, 20-27 x 9-12 µm  according to our measures.  Pycnidia rare and dispersed, 0.1-0.25 mm diam. Conidia 3-5 x 0.8-1 µm. Photobiont : Trentepohlia. Thallus : C-, K-, KC-, P-. Widespread and locally common species on rough bark decidous trees. Possible confusion with Anisomeridium biforme (smaller perithecia and more numerous pycnidia with black hypothallus) and  Pyrenula macrospora (brown-green thallus delicately spotted).







Acrocordia gemmata (Ach.) Massal. Garvan
Bernard BOUFFINIER



Acrocordia gemmata Crozon
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Acrocordia gemmata Saint Claude
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Acrocordia gemmata Landévennec
Bernard BOUFFINIER



Acrocordia gemmata Coupe périthéce Landévennec 2
Jacques HAINE



Acrocordia gemmata Coupe périthéce Lugol Landévennec 3
Jacques HAINE



Acrocordia gemmata Asque eau Landévennec 4
Jacques HAINE



Acrocordia gemmata Asque Lugol Landévennec 5
Jacques HAINE



Acrocordia gemmata Spores Lugol Landévennec 6
Jacques HAINE



Acrocordia gemmata Landévennec 7
Bernard BOUFFINIER



Acrocordia gemmata Le Loc'h 1
Bernard BOUFFINIER



Acrocordia gemmata Le Loc'h 2
Bernard BOUFFINIER



Acrocordia gemmata Coupe KOH Belgique Hermeton 1
Jacques HAINE



Acrocordia gemmata Bouquets d'asques KOH Belgique Hermeton S2
Jacques HAINE



Acrocordia gemmata Bouquets Asques KOH Belgique Hermeton S3
Jacques HAINE



Acrocordia gemmata Asque Bleu Coton Belgique Hermeton 4
Jacques HAINE



Acrocordia gemmata Spores KOH Belgique Hermeton 5
Jacques HAINE



Acrocordia gemmata Spores Bleu Coton Belgique Hermeton 6
Jacques HAINE



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