Staurothele frustulenta Vain.

Acta Soc. Fauna Fl. Fenn., 49, 2: 93, 1921.
Synonyms: Polyblastia spadicea (Wallr.) Jatta; Staurothele catalepta auct. p.p. non (Ach.) Blomb. & Forssell; Staurothele elegans (Wallr.) Zwackh; Stigmatomma spadiceum (Wallr.) Körb.
Distribution: N - TAA (Herb. Nascimbene 2105), VA (Matteucci & al. 2013), Lig (TSB 33552). C - Abr (Jatta 1909-1911). S - Bas (Nimis & Tretiach 1999).
Description: Thallus crustose, episubstratic, thick, grey to chestnut brown, rarely dark brown, sometimes pale grey-pruinose, areolate and often secondarily cracked into small groups of convex areoles, rarely delimited by a white to brownish prothallus; fertile areoles distinctly larger than the sterile ones. Perithecia black, 0.2-0.45 mm across (in section), mostly one per areole, either completely immersed, or slightly projecting and with the basal parts covered by a thalline layer. Involucrellum apical, poorly developed, dark brown to black, rarely reaching to base-level; exciple colourless or pale brown, darker around the ostiole; hymenial gel I+ red (I+ blue at very low concentrations of iodine), K/I+ blue; hymenial algae globose-cuboid, 2-5 μm wide; hamathecium of periphyses and periphysoids, interascal filaments absent. Asci 2-spored, verrucarioid, clavate, the wall thickened above, with an ocular chamber, after dehiscence with a delicate extruded endotunica, I-, K/I-. Ascospores muriform, pale brown at maturity, oblong-ellipsoid, 33-54 x 12-25 μm, the upper spore wider and often longer than the other. Photobiont chlorococcoid, present in both thallus and hymenium. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on calcareous or basic siliceous rocks in open habitats, mostly below the subalpine belt. See also note on S. areolata.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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


Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29885)
2002/12/04



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010



Felix Schumm CC BY-SA 4.0
[16494], Germany, Baden-Württemberg, Rems-Muss-Kreis, Stetten/ Rems, Haldenbachtal, an kalkhaltigem Sandsteinblock, 48,77637° N, 9,33998° E, 311 m. Leg. et det. Schumm 17.05.2010