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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, 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) times septate, 35-55 x 1.2-1.5 µm according to the literature; 25-53 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.







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 Coupe de l'apothécie Barcelona 3
Antonio Valero Risoto



Bacidia arceutina Lesteven 3
Bernard BOUFFINIER



Bacidia arceutina Barcelona 5
Antonio Valero Risoto



Bacidia arceutina Lesteven 2
Bernard BOUFFINIER



Bacidia arceutina Asques Crozon 3
Jacques HAINE



Bacidia arceutina Lesteven 1
Bernard BOUFFINIER



Bacidia arceutina Lesteven 4
Bernard BOUFFINIER



Bacidia arceutina Lesteven 5
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



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