Absconditella lignicola Vězda & Pišút

Nova Hedwigia, 40: 344, 1985 (1984).
Synonyms:
Distribution: N - TAA (Thor & Nascimbene 2007, Nascimbene & al. 2022).
Description: Thallus crustose, very thinly episubstratic, subgelatinous when wet, minutely granulose, greenish grey to dark green, usually intermixed with algal films. Apothecia short-lived, semi-immersed to broadly sessile, whitish or pale waxy yellow when dry, translucent when moist, round, 0.1-0.2 mm across, with a concave to finally flat disc, and a scarcely raised, moderately thick, entire proper margin. Proper exciple colourless, laterally 40-50 µm wide, of conglutinated, parallel hyphae; epithecium indistinct, colourless; hymenium colourless, 60-65(-70) µm high, I+ yellowish, K/I-; paraphyses dense, slender, indistinctly septate, simple or forked, 0.5-0.8 µm thick, irregularly broadened at tips; hypothecium very thin, colourless. Asci 8-spored, long-cylindrical, thin-walled, the upper part with a distinct, K/I- apical dome penetrated by a long, narrow tube extending from the endoascus. Ascospores 3-septate, hyaline, fusiform, 9-15 x 4-7 µm, with very thin walls and septa. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a boreal-montane, ephemeral lichen, mostly found on horizontal surfaces of stumps and logs, mostly of conifers, with optimum in the subalpine belt. Easily overlooked, it might be more widespread in the Alps.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

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

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Lignicolous on a dead trunk of Pinus sylvestris.Central Europe; Germany: Hesse.(Coll/ident: Eichler & Cezanne).



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11523)
2001/12/12
isotypus



Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11523)