Arthonia ligniaria Hellb.

K. Svenska Vetensk-Akad. Handl., n. f. 20, 8: 112, 1884
Synonyms:
Distribution: N - TAA (TU-F072499).
Description: Thallus crustose, endosubstratic, inconspicuous, often consisting of subgelatinous green algal clumps surrounding the apothecia. Apothecia arthonioid, black, rounded, flat to convex, 0.1-0.3 mm across, up to 0.1 mm tall, without a proper margin, all parts K/I-. Proper exciple poorly developed; epithecium dark brown, 7-10 μm high, K+ olive-brown; hymenium colourless to pale yellow-brown, 40-50 μm high, K+ pale yellow-olive, I-, K/I-; paraphysoids branched and anastomosing, up to 2 μm thick, the apical cells up to 5 μm wide, dark-capped; hypothecium pale to dark brown, 45-55 μm high, K+ pale yellow-olive, , I-, K/I-. Asci 8-spored, subglobose, semi-fissitunicate, with a large apical dome and a distinct ocular chamber, Arthonia-type. Ascospores 1-septate, constricted at septum, hyaline (sometimes turning brownish when overmature), ellipsoid to cylindrical-obovoid, 17-22 (-26) x 6.5-9.5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a rare species found on acid bark, rarely also reported from sandy soil, most frequent in northwestern Europe.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Photo uploaded by Paul Cannon. CC BY-NC - Source: https://fungi.myspecies.info/all-fungi/arthonia-ligniaria


Photo uploaded by P. Cannon, CC BY-SA NC Source: http://fungi.myspecies.info/file/14606


Photo uploaded by Paul Cannon. CC BY-NC - Source: https://fungi.myspecies.info/all-fungi/arthonia-ligniaria


Photo uploaded by Paul Cannon. CC BY-NC - Source: https://fungi.myspecies.info/all-fungi/arthonia-ligniaria


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Textes_A3/Arthonia_ligniaria.htm
France, sur rhytidome de Juniperus communis, alt. 1630 m - Névache, Hautes-Alpes
24/1/2017


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Textes_A3/Arthonia_ligniaria.htm
France, sur rhytidome de Juniperus communis, alt. 1630 m - Névache, Hautes-Alpes
24/1/2017