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Acrocordia gemmata (Ach.) Massal.

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.

N.B. Possible confusion with Anisomeridium biforme (smaller perithecia and more numerous pycnidia with black hypothallus) and  Pyrenula macrospora (brown-green thallus delicately spotted).

N.B. There is a very similar species Acrocordia cavata, with smaller spores which is much rarer and localized.





Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata (Ach.) Massal. Garvan
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Crozon
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Saint Claude
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Landévennec
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Coupe périthéce Landévennec 2
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Coupe périthéce Lugol Landévennec 3
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Asque eau Landévennec 4
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Asque Lugol Landévennec 5
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Spores Lugol Landévennec 6
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Landévennec 7
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Le Loc'h 1
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Le Loc'h 2
Bernard BOUFFINIER

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Coupe KOH Belgique Hermeton 1
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

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

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Bouquets Asques KOH Belgique Hermeton S3
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Asque Bleu Coton Belgique Hermeton 4
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Spores KOH Belgique Hermeton 5
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Spores Bleu Coton Belgique Hermeton 6
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Lesteven 1
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Coupe périthèce KOH Lesteven 2
Jacques HAINE

Acrocordia gemmata (Ach.) Massal.

Acrocordia gemmata Asque Bleu Coton Lesteven 3
Jacques HAINE



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