Thelotrema suecicum (H. Magn.) P. James

Lichenologist, 9: 186, 1977. Basionym: Ocellularia suecica H. Magn. - Bot. Not.: 125, 1937.
Synonyms:
Description: Thallus crustose, endo- to thinly episubstratic, pale yellowish grey to pale greyish green, smooth, continuous to verruculose or finely rimose. Medulla white, densely packed with crystals of calcium oxalates. Apothecia usually numerous, evenly distributed, deeply immersed in prominent, conical thalline warts which are 1-2 mm wide at the base, and have an open, up to 0.4 mm wide, crater-like summit with an irregular thalline rim, the disc to 0.7 mm across, blackish or grey-pruinose, surrounded by a prominent proper margin which is usually free from the thalline margin. Proper exciple thin, brownish to yellowish in outer part, colourless to very pale yellow within, apically covered by greyish granules, of densely conglutinated, short-celled hyphae; epithecium colourless to brownish, with greyish granules; hymenium colourless, up to c. 130 µm high, not inspersed with oil droplets; paraphyses weakly conglutinated, mostly simple, thickened at apex; periphysoids present, lining the upper inner surface of the exciple; hypothecium colourless. Asci (2-)4-6(-8)-spored, subcylindrical, with a single functional wall layer, abruptly thickened at apex, K/I-. Ascospores transversally (3-)5-7(-10)-septate, hyaline but sometimes turning brownish when overmature, ellipsoid to broadly fusiform, the ends narrowly rounded to subacute, (18-)20-35(-44) x 8-12(-15) µm, with 4-6(-8), rounded to angular, subglobose or cuboid cells, surrounded by a thin to thick halo, non-amyloid to faintly amyloid. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Montane belt: extremely rare
Dry submediterranean belt: absent
Humid submediterranean belt: extremely rare
Padanian area: 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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Rarity

absent
extremely rare
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common
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extremely common
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P.L. Nimis CC BY-SA 4.0
TSB 30535


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35535)
2003/03/19


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35535)
2003/03/19