Arthonia subfuscicola (Linds.) Triebel

Mycotaxon, 42: 268, 1991. Basionym: Microthelia subfuscicola Linds. - Quart. J. Microsc. Sci., N.S., 11: 39, 1871.
Synonyms: Arthonia glaucomaria var. pallidae Rehm ex Almq.; Celidium varians var. pallidae Rehm nom.nud.
Distribution: N - Lomb (Anzi 1860, Brackel 2008c, 2015, 2016), Piem (Brackel 2015, 2016). C - Laz (Brackel 2015, 2016), Abr (Brackel 2015, 2016), Sar (Brackel & Berger 2019). S - Pugl (Brackel 2015, 2016), Si (Brackel 2008c, 2015, 2016).
Description: Thallus endosubstratic, not evident and not lichenized, developing inside the apothecia, rarely the thallus, of epiphytic Lecanora-species. Apothecia arthonioid, to 0.25 mm across, forming dark spots, round to irregular in outline, with a black, epruinose, flat to slightly convex disc, without a distinct proper margin. Proper exciple poorly developed; epithecium greenish brown, 10-15 µm high; hymenium colourless, 40-55 µm high, I+ red; paraphysoids c. 2 µm thick at mid-level, the uppermost cells usually slightly swollen; hypothecium brown, up to 25 µm high. Asci 8-spored, broadly clavate to subglobose, semi-fissitunicate, with a large apical dome and a distinct ocular chamber, Arthonia-type. Ascospores 3-septate, hyaline to pale brown, narrowly ovoid, 14-17.5 x 5-7 µm, with a thin gelatinous epispore reacting I+ red, K/I+ blue. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: this widespread lichenicolous fungus causes dark spots on the whitish apothecia of Lecanora carpinea, L. chlarotera and L. albella.
Growth form: Lichenicolous fungus
Substrata: bark
Reproductive strategy: mainly sexual
paras Lecanora spp.

Commonnes-rarity: (info)

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


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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Paul Cannon - Source: http://fungi.myspecies.info/taxonomy/term/8415/media; Owner: CC BY-NC


Paul Cannon - Source: http://fungi.myspecies.info/taxonomy/term/8415/media; Owner: CC BY-NC


Paul Cannon - Source: http://fungi.myspecies.info/taxonomy/term/8415/media; Owner: CC BY-NC