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Bacidia arceutina (Ach.) Arnold

Synonyms:

Family: RAMALINACEAE

Habitat: Ubiquitous

Description

   Thallus very thin, sometimes hardly visible, smooth or minutely granular or rimose (under magnifying lens), pale green-grey or grey. Apothecia usually numerous, scattered, immersed initially then ± sessiles, 0.2-0.6 mm diam., discs at first flat and marginate but often becoming convex, to a little globulose in old age, pale brown to brown-black, almost dark when old, concolorous margin or darker and blackish, thick and clearly visible at the beginning then disappearing with time and finally immarginate. Hymenium section colourless (under the microscope). Asci with 8 spores, long utriform, 50-70 x 8-10 µm, according to our measurements. Spores needle-shaped (acicular), 3 to 8 (10)-septate, 35-55 x 1.2-1.5 µm according to the literature; 42-50 x 1.5-2.5 µm according to our measurements. Photobiont : Chlorphycea. Common but almost unseen due to its small size; on trunks, branches and leafstalks of trees and shrubs, and also (but rarely) on plant debris.

Cf.  Bacidia laurocerasi whose thallus is more bluish and the apothecia more black at the end.







Bacidia arceutina Ardennes 1
Jacques HAINE



Bacidia arceutina Crozon 1
Jacques HAINE



Bacidia arceutina Barcelona 1
Antonio Valero Risoto



Bacidia arceutina Barcelona 2
Antonio Valero Risoto



Bacidia arceutina Barcelona 5
Antonio Valero Risoto



Bacidia arceutina Asques Crozon 3
Jacques HAINE



Bacidia arceutina Lesteven 1
Bernard BOUFFINIER



Bacidia arceutina Lesteven 4
Bernard BOUFFINIER



Bacidia arceutina Lesteven 6
Jacques HAINE



Bacidia arceutina Coupe apothécie KOH Lesteven 7
Jacques HAINE



Bacidia arceutina Paraphyses Bleu Coton Lesteven 8
Jacques HAINE



Bacidia arceutina Asques et paraphyses Bleu Coton Lesteven 9
Jacques HAINE



Bacidia arceutina Asques Lugol Lesteven 10
Jacques HAINE



Bacidia arceutina Spores KOH Lesteven 11
Jacques HAINE



Bacidia arceutina Spores Lesteven 12
Jacques HAINE



Bacidia arceutina Coupe apothécie KOH Lesteven 13
Jacques HAINE



Bacidia arceutina Coupe apothécie Acide nitrique N Lesteven 14
Jacques HAINE



Bacidia arceutina Asques Lugol Lesteven 15
Jacques HAINE



Bacidia arceutina Spores Bleu Coton Lesteven 16
Jacques HAINE



Bacidia arceutina Spores Lugol Lesteven 17
Jacques HAINE



Bacidia arceutina Crozon 1
Bernard BOUFFINIER



Bacidia arceutina Crozon 2
Bernard BOUFFINIER



Bacidia arceutina Lesteven 1
Bernard BOUFFINIER



Bacidia arceutina Lesteven 2
Bernard BOUFFINIER



Bacidia arceutina Lesteven 3
Bernard BOUFFINIER



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