Acarospora similis H. Magn.

K. Svenska Vetensk.-Akad. Handl., ser. 3, 7, 4: 175, 1929.
Synonyms:
Distribution: N - Ven (Nascimbene & al. 2021), TAA (B-8504 Leg. H. Sipman), Emil (Ravera & al. 2022b).
Description: Thallus crustose, episubstratic, areolate-subsquamulose, without a distinct prothallus, forming c. 1 cm wide patches. Areoles 0.2-1.4 mm wide, contiguous, irregular in shape, sometimes the peripheral ones sublobulate, slightly concave to flat, medium to dark chestnut brown, epruinose. Apothecia lecanorine, 0.1-0.6 mm across, rounded or sometimes irregular by mutual compression, at first immersed then slightly projecting, with a slightly concave to flat, rugose, sometimes umbonate, dark brown disc (darker than thallus), and a usually paler brown, raised, smooth thalline margin. Epithecium yellowish brown; hymenium colourless, 50-90 µm high, the hymenial gel euamyloid, IKI+ persistently dark blue; paraphyses c. 1.5 µm thick at base, the apical cells capitate, 3-4 µm wide; hypothecium colourless, 15-35 µm high. Asci 100(-200)-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, narrowly ellipsoid to cylindrical, (3-)4-6(-6.5) x 1-2.5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a lignicolous species, often found on woody roofing tiles, from the dry submediterranean to the subalpine belt.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: very 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
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 42609



P.L. Nimis CC BY-SA 04
TSB 42609



P.L. Nimis CC BY-SA 4.0
TSB 42609



P.L. Nimis CC BY-SA 04
TSB 42609


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Textes_A2/Acarospora_similis.htm
France, stage micro de nov. 2015 - Saint-Prejet-Armandon - Haute-Loire


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Textes_A2/Acarospora_similis.htm
France, stage micro de nov. 2015 - Saint-Prejet-Armandon - Haute-Loire


Courtesy Philippe Blaise - Source: https://likenoj.ch/index.php/samples/865
Switzerland