Bacidina modesta (Zwackh ex Vain.) S. Ekman

in Ekman & al., Graphis Scripta: 39, 2019. Basionym: Biatora modesta Zwackh ex Vain. - Acta Soc. F. Fl. Fenn., 53, 1: 171, 1922
Synonyms: Bacidia sulphurella Samp.; Bacidina sulphurella (Samp.) M. Hauck & V. Wirth; Woessia fusarioides D. Hawksw.
Distribution: N - Frl (TSB 31400). S - Cal (Brand & al. 2009).
Description: Thallus crustose, finely granular, entirely made of 20-40 µm wide, green goniocysts that may or may not form coralline structures. Apothecia biatorine, 0.3-0.8(-1.2) mm across, whith a white-grey to grey-brown disc, often with a slight violet hue, and a paler, raised, sometimes white-pruinose proper margin; when wetted, the margin turns darker before the disc. Proper exciple without crystals, the rim colourless to pale brown, the hyphae towards the outer part with ellipsoidal lumina, 3-7 x 1.5-5 μm; hymenium colourless or pale brown in upper part; paraphyses 1-1.6 µm thick at mid-level, the apical cells clavate to slightly thickened, up to 4 µm wide; hypothecium and adjacent excipulum dark brown to red-brown K+ dark brown (Arnoldiana-brown pigment). Asci 8-spored, cylindrical-clavate, approaching the Bacidia-type, but the ocular chamber wider, and the axial body never penetrating through the entire d-layer, surrounded by a narrow, darker amyloid layer. 1-3(-7)-septate, hyaline, acicular, straight to curved, (19-)24-48 x 0.9-2 µm. Pycnidia white, nearly always present and usually abundant, 0.15-0.3 mm in diam., sometimes lobate and seemingly multilocular. Conidia filiform, curved or not, but always with at least one extremity strongly hooked and slightly enlarged at one end, 0-3-septate, 27-45(-55) x 1-1.7 μm. Photobiont chlorococcoid. Spot tests: Thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances; Arnoldiana-brown pigment in apothecia.
Note: on bark, especially of Sambucus, sometimes invading corticolous mosses, more rarely on twigs, needles and living leaves in very humid sites, very rarely also on rock. Some records of epiphytic B. arnoldiana could refer to this species. For further details see Czarnota & Guzow-Krzeminska (2012).
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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


pH of the substrata:

(info)

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5

Solar irradiation:

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5

Aridity:

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5

Eutrophication:

(info)

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Poleotolerance:

(info)

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Altitudinal distribution:

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Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.


Mark Powell CC BY-SA-NC Source: http://fungi.myspecies.info/all-fungi/bacidia-sulphurella



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.



Felix Schumm – CC BY-SA 4.0
[16540], Germany, Baden-Württemberg, Schwarzwald-Baar-Kreis, an der Straße von Hornberg nach Schramberg, Abbiegung zum Käppelehof. 48,22853° N, 8,31805° E, 670 m, an Sorbus. Leg. et det. Schumm 07.07.2010.