Lithothelium triseptatum (Nyl.) Aptroot

Bibl. Lichenol., 44: 70, 1991. Basionym: Verrucaria conoidea var. triseptata Nyl. - Act. Soc. Linn. Bordeaux, 21: 435, 1856.
Synonyms: Acrocordia conoidea var. triseptata (Nyl.) Boistel; Acrocordia triseptata (Nyl.) Vězda; Porina acrocordioides (Zahlbr.) Zahlbr.; Porina lilacina Zschacke; Spermatodium triseptatum (Nyl.) Trevis.
Distribution: C - Tosc (TSB 35208), Sar. S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999), Bas (Bartoli & Puntillo 1996, 1998), Si (Grillo & al. 2007b).
Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous ro rimose around the perithecia, whitish to violet-grey. Perithecia black, 0.4-1 mm across, half- immersed, hemispherically projecting with the upper half, with an apical ostiole. Exciple carbonized in the upper half, colourless to pale brown in lower half, up to 120 µm thick; hamathecium of persistent, slender, 1-2 µm thick, sparingly branched paraphyses; hymenial gel K/I- blue or parly orange. Asci (6-)8-spored, cylindrical, without ocular chamber. Ascospores 3-septate, not constricted at septa, hyaline, spindle-shaped with subacute ends, 17-22 x (6-)8-10(-12) μm, uniseriately arranged in the asci, without a perispore. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a subtropical species of sheltered, warm-humid, shaded surfaces of calcareous rocks, usually not far from the sea; to be looked for further in Tyrrhenian Italy.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: rare
Dry mediterranean belt: extremely rare

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


Domenico Puntillo - CC BY-SA 4.0
Italy, Campania, Gorge of River Bussento
CLU Nr. 18086.



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31835)
2001/12/09



Domenico Puntillo; Owner: Domenico Puntillo
Italy, Puntillo 10459



D. Puntillo CC BY-SA 4.0



Felix Schumm - CC BY-SA 4.0
[ABL57387], China, Yunnan Prov., Xishuangbanna, 2 km SE of Menglun, Green Stone Park, 600 m, 21°54’37’’ N, 101°16’51’’ E, on limestone. Leg. A. Aptroot (no 57387), 1.11.2002, det A. Aptroot, 2003.



Felix Schumm - CC BY-SA 4.0
[ABL57387], China, Yunnan Prov., Xishuangbanna, 2 km SE of Menglun, Green Stone Park, 600 m, 21°54’37’’ N, 101°16’51’’ E, on limestone. Leg. A. Aptroot (no 57387), 1.11.2002, det A. Aptroot, 2003.



P.L. Nimis CC BY-SA 4.0
TSB 31835



Domenico Puntillo - CC BY-SA 4.0
Italy, Campania, Gorge of River Bussento
CLU Nr. 18086.