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Arthonia punctiformis  Ach.

Synonyms:

Family: ARTHONIACEAE

Habitat: Ubiquitous

Description

     Thallus very thin, immersed in bark, usually effuse, indistinct or slightly 'bleaching' the bark: whitish, pale grey, pale brown, prothallus absent. Apothecia scattered all over the thallus, usually immersed, flat and non erumpent, variable in size and shape, rounded, elliptic to linear, rarely branched or substellate, 0,2-1,2 mm, black, not pruinose. Ascospores colourless, oblong-ovoid to oblong, 3 (-5)-septate, apical cell not enlarged, 15-23 x 5-7 µm. Photobiont : Trentepohlia. Chemical spot test negative. Often a primary common colonizer on smooth bark of twigs of a wide variety of deciduous trees and shrubs. Often associated with Arthopyrenia punctiformis but with ascospores uni-septate. N.B. This species does not seem to have photobiont and probably is not lichenized.*







Arthonia punctiformis Ardennes 1
Jacques HAINE



Arthonia punctiformis Ardennes 2
Jacques HAINE



Arthonia punctiformis Ardennes 3
Jacques HAINE



Arthonia punctiformis Ardennes 4
Jacques HAINE



Arthonia punctiformis Spores
Jacques HAINE



Arthonia punctiformis (à droite blanchâtre) et Arthopyrenia punctiformis (à gauche grisâtre) sur branche de bouleau, Ardennes
Jacques HAINE



Arthonia punctiformis Spores dans le lugol.
Jacques HAINE



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