ITALIC 8.0

Thelignya arnoldii (Frauenf.) M. Schultz & M. Prieto

Studies in Mycology, 109: , 624, 2024.. Basionym: Psorotichia arnoldii Frauenf. - in Arnold, Verh. K. K. zool.-bot. Ges. Wien, 14: 462, 1864.

Synonyms: Psorotichia taurica (Nyl.) Vain.; Psorotichia tiroliensis Zahlbr.

Distribution: N - TAA (Dalla Torre & Sarnthein 1902, Schultz 2014, Nascimbene & al. 2022).

Description: Thallus crustose, black to brown-black, subgelatinous when wet, granulose to minutely areolate, forming 1-3 cm wide, irregular patches, pseudoparenchymatous throughout. Areoles 0.15-0.5 mm across, up to 0.3 mm thick, the surface finely granulose. Apothecia formed from a spheroid tangle of generative hyphae with ascogones and trichogynes (no pycnoascocarps), at fist semi-immersed and punctiform, then sessile, up to 0.25 mm across, with a blackish, urceolate, sometimes umbonate disc and a prominent, persistent thalline margin. Proper exciple thin; epithecium blue green to emerald green, K-; hymenium colourless or greenish in upper part, 80-100 µm high, usually with central intrusions of sterile hyphae forming a small umbo, I-; paraphyses slender, septate; hypothecium colourless. Asci 16-spored, narrowly cylindrical-clavate, with a very thin wall disintegrating or opening by apical ruptures, without apical amyloid structures, Lichina-type. Ascospores 1-celled, hyaline, globose and 6-7 µm wide, or broadly ellipsoid and (5-)7-9(-10) x (3-)5-8 µm. Pycnidia immersed, broadly pyriform, (0.05-)0.1-0.125 mm across, unilocular or finally plurilocular. Conidia broadly ellipsoid, (2-)2.5-3.5 x 1.5-2 µm, produced terminally on simple conidiophores. Photobiont cyanobacterial (Rivulariaceae), filamentous, the tips of filaments tapered, basally often with heterocysts (but filaments often much contorted and split). Spot tests: all negative. Chemistry: without lichen substances.

Note: a very poorly known species; ecological indicator values are tentative.

Growth form: Crustose

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly sexual

On otherwise dry surfaces with short periods of water seepage after rain

Poorly known taxon in need of further study

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: 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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(info)

Aridity:

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Eutrophication:

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(info)

Poleotolerance:

0

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(info)

Altitudinal distribution:

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(info)

Predictive model

Jason Hollinger - Source: https://www.waysofenlichenment.net/lichens/Psorotichia%20taurica

USA, Utah