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Arthothelium ruanum (A. Massal.) Körb.

Arthonia ruana Massal.

Arthonia anastomosans(Ach.) Nyl.

Arthothelium dispersum ss. auct.

Description

      Thallus strongly encrusted in the bark, more or less smooth, cream, pale gray, greyish-brown, olive-gray, rarely bordered by a dark brownish hypothallus. Apothecia of 1-2 mm, included or on the surface of the thallus, misshapen, irregularly rounded, very often as if broken into several fragments, blackish-brown. Spores oblong, colorless but light brown at the end, muriform "rubber boot imprint" with 4-9 transverse septa and 1-3 longitudinal septa, 17-24 x 7-10 µm according to literature, 18-25 x 8 -10 µm according to our measurements. Pycnidia blackish-brown. Photobiont: Trentepohlia. C-, K-, KC-, P-. Uncommon species occurring on the smooth bark of deciduous trees in forests with a temperate oceanic climate.

Arthothelium ruanum Belgique Cerfontaine 1
Jacques HAINE

Arthothelium ruanum Belgique Cerfontaine 2
Jacques HAINE

Arthothelium ruanum Belgique Hayet 1
Jacques HAINE

Arthothelium ruanum Belgique Hayet 2
Jacques HAINE

Arthothelium ruanum Belgique Hayet 3
Jacques HAINE

Arthothelium ruanum Coupe apothécie eau Belgique Hayet 4
Jacques HAINE

Arthothelium ruanum Asques eau et K Belgique Hayet 5
Jacques HAINE

Arthothelium ruanum Asques Bleu Coton Belgique Cerfontaine 6
Jacques HAINE

Arthothelium ruanum Asques Lugol Belgique Hayet 7
Jacques HAINE

Arthothelium ruanum Spores eau et K Belgique Hayet 8
Jacques HAINE

Arthothelium ruanum Spores Bleu coton Belgique Hayet 9
Jacques HAINE

Arthothelium ruanum Spores Lugol Belgique Hayet 10
Jacques HAINE

Arthothelium ruanum sur bambou de jardin Crozon 1
Jacques HAINE

Arthothelium ruanum sur bambou de jardin Crozon 2
Jacques HAINE

Arthotelium ruanum Belgique Charleroi 1
Jacques HAINE

Arthotelium ruanum Belgique Charleroi 2
Jacques HAINE