Thelidium amylaceum A. Massal.

Framm. Lichenogr.: 15, 1855.
Synonyms:
Distribution: N - VG (TSB 15238), Ven (Lazzarin 2000b).
Description: Thallus crustose, endosubstratic, farinose, whitish with a violet to lilac tinge. Perithecia black, 0.3-0.4 mm across, bottle-shaped, entirely immersed in the rock and visible only by the depressed ostiolar region, sometimes surrounded by a swelling of the thallus. Involucrellum absent; exciple dark throughout or paler in lower half; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, narrowly ellipsoid to clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of a delicate rostrum. Ascospores 1-septate, hyaline, ellipsoid, 20-42 x (8-)10-18 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a very poorly known calcicolous species, sometimes synonymised with T. decipiens. The type material (see Lazzarin 2000b) urgently needs further study because this is the type species of Thelidium.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

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


P.L. Nimis CC BY-SA 04
TSB 15238


Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain



Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15238)