Absconditella annexa (Arnold) Vězda

Preslia, 37: 244, 1965. Basionym: Secoliga annexa Arnold - Verh. zool.-bot. Ges. Wien, 25: 256, 1875.
Synonyms: Gyalecta annexa (Arnold) H. Olivier
Distribution: N - Frl (Tretiach & Hafellner 2000).
Description: Thallus crustose, very thinly episubstratic, yellowish grey to dark olive-green, often inconspicuous, c. 50-80 µm thick, subgelatinous when wet. Apothecia round or somehow elongated by mutual compression, yellowish white, pale waxy yellow to very pale brownish, translucent when wet, 0.3-0.4(-0.5) mm across, with an initially concave, finally flat disc, and a scarcely raised, moderately thick, paler, entire proper margin. Proper exciple colourless, to 35 μm thick laterally, to 20 μm thick basally; epithecium indistinct, colourless; hymenium colourless, 70-90 μm high; paraphyses mostly simple, rarely forked in upper part, not or only slightly thickened at tips; hypothecium very thin, colourless. Asci 8-spored, long-cylindrical, thin-walled, the upper part with a rather indistinct, K/I- apical dome penetrated by a narrow tube. Ascospores (3-)5-7(-9)-septate, hyaline, narrowly fusiform to almost needle-like, straight or slightly curved, 35-40(-50) x 2.5-3.5 μm. Photobiont chlorococcoid, the cells 8-12 μm across. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a probably arctic-alpine, ephemeral lichen found on muribund bryophytes and organic soil on siliceous substrata, with optimum near and above treeline. Easily overlooked, it is perhaps more widespread in the Alps.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: absent
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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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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P.L. Nimis CC BY-SA 04
TSB 8246



Pier Luigi Nimis - CC BY-SA 4.0
TSB 8246