Biatora helvola Hellb.

Körb. ex Hellb., Öfvers. K. Svensk. Vetensk.-Akad. Förh., 24: 271, 1867.
Synonyms: Lecidea vernalis subsp. helvola (Hellb.) Th. Fr.
Description: Thallus crustose, episubstratic, greenish grey to pale grey, continuous, rimose or warted, the warts weakly convex and irregular in outline, 0.1-0.3 mm wide. Apothecia biatorine, rounded or slightly irregular in outline, sessile with a slightly constricted basis, single and 0.3-0.5 mm across, or coalescing-tuberculate and 0.5-1 mm across, with a beige to pale reddish brown, epruinose, flat to moderately convex disc, and a concolorous or paler, thin, soon excluded proper margin. Proper exciple colourless or yellowish, of radially arranged hyphae, laterally 30-70 µm wide, basally much wider, the outer part often with tiny granules of gyrophoric acid forming a smear between the hyphae; epithecium scarcely differentiated from the hymenium, colourless or pale yellow; hymenium 40-60 µm high, colourless or yellowish, the pigmented parts often arranged in thin longitudinal stripes; paraphyses simple or sparingly branched in upper part, 1-1.5(-2) µm thick at mid-level, the apical cells to 2.5-3 µm wide; hypothecium colourless or pale yellow, 25-110 µm high. Asci 8-spored, clavate, with a K/I+ blue apical dome penetrated by a narrow, K/I- apical cushion surrounded by a narrow, deeply K/I+ blue zone, the wall K/I- but surrounded by an I+ red-brown, K/I+ blue outer layer, the ocular chamber relatively small, Biatora-type, 31-46 x 7-12 µm. Ascospores 1-celled (rarely 1-septate), hyaline, (8.5-)10-14(-17) x 3-5 µm. with a c. 0.5 mm thick perispore. Pycnidia rare, immersed, to 40 µm across, the wall colourless. Conidia bacilliform, 6.5-8 x 0.7-1 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C- or faintly C+ pink, KC- or faintly KC+ pink, P- (positive reactions often fleeting and poorly evident); apothecial sections fleeting C+ pink. Chemistry: gyrophoric acid (major), and traces of lecanoric acid.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rather common
Montane belt: rather rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent

pH of the substrata:

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Altitudinal distribution:

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Rarity

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Predictive map

Wolfgang von Brackel - CC BY-4.0
Germany, Bavaria, Allgäu, Breitachklamm


Wolfgang von Brackel - CC BY-4.0
Germany, Bavaria, Allgäu, Breitachklamm


Wolfgang von Brackel - CC BY-4.0
Germany, Bavaria, Allgäu, Breitachklamm


E. Pittao CC BY-SA 4.0
TSB 29410


E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29410)
2008.03.31


E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29410)
2008.03.31


E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29410)
2008.03.31