ITALIC 8.0

Biatora meiocarpa (Nyl.) Arnold

Verh. zool.-bot. Ges. Wien, 37: 141, 1887. Basionym: Lecidea meiocarpa Nyl. - Flora, 59: 577, 1876.

Synonyms: Biatora meiocarpa (Nyl.) Arnold; Lecidea meiocarpa Nyl.; Lecidea minuta auct. non (Nyl.) Nyl.

Distribution: N - TAA (Nascimbene & al. 2022), Lomb, Lig.

Description: Thallus crustose, rimose-areolate or small-areolate, sometimes partly endosubstratic, pale beige to greyish green. Apothecia biatorine, rounded to rarely deformed-tuberculate, sessile and constricted at base, 0.45-0.6 mm across, with an orange brown to brown, epruinose, flat to slightly convex disc, and a thin, usually paler, sometimes indistinct, finally excluded proper margin. Proper exciple colourless throughout to orange-brown in innermost part, laterally 30-75 µm wide, of radiating hyphae with 1.5-3.5 µm thick lumina, the apical cells 2-6 µm wide; epithecium scarcely differentiated from the hymenium, colourless or rarely with orange-brown droplets; hymenium colourless to pale golden brown, 40-55 µm high; paraphyses simple or weakly branched and anastomosing, 0.7-1.2 µm thick at mid-level, the apical cells 1.5-4 µm wide; subhymenium distinct, 20-60 µm high; hypothecium colourless, 35-120 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. Ascospores 1-celled (rarely a few 1-septate), hyaline, (7.5-)10-15(-17) x 3-4(-5) µm. Pycnidia globular, semi-immersed, c. 100 µm in diam., the wall colourless to pale brown. Conidia broadly filiform, 25-35(-45) x 1-1.8 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.

Note: Ekman (1994) states that this is a northern species, confined to Fennoscandia; reports from central Europe could be due to misidentifications, perhaps with the similar B. helvola, with Lecania cyrtellina, or with epiphytic samples of B. subduplex. All Italian records (see Nimis 1993: 386) should be checked.

Growth form: Crustose

Substrata: bark

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: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

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5

(info)

Solar irradiation:

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5

(info)

Aridity:

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(info)

Eutrophication:

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(info)

Poleotolerance:

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(info)

Altitudinal distribution:

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(info)

Predictive model

Index Fungorum GBIF

Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php