ITALIC 7.0

Arthonia neglectula Nyl.

Flora, 57: 13, 1874

Synonyms:

Distribution:

Description: Thallus inapparent, not lichenized, developing on the thalli of saxicolous leprose lichens. Apothecia arthonioid, black, at first partially immersed in the host thallus, then sessile, rounded, 0.1-0.2 mm across, flat to finally convex, with a rough surface, without an evident proper margin. Proper exciple poorly developed, formed by strongly carbonized hyphae; epithecium strongly carbonized with dark brown pigments, K+ olive-black, 5-15 μm high; hymenium colourless to pale yellow-brown, sometimes with orange-brown granules, 20-30 μm high, I+ wine red, K/I+ pale blue; paraphysoids scanty and inconspicuous, the cells 3-4 x 0.5-1 μm; hypothecium brown, 20–30 μm high. Asci 8-spored, broadly clavate, I–, K/I+, with an inconspicuous, slightly elongated ring in the tholus, 25-32 x 11-15 μm. Ascospores 1-septate, not or only slightly constricted at septum, hyaline, cylindrical-obovoid, 7-10 x 3-4 μm, with a gelatinous sheath which is most evident in K. Photobiont absent. Spot tests: all negative in thallus. Chemistry: without lichen substances.

Note: a lichenicolous fungus growing on Lepraria-species on siliceous rocks; probably more widespread, but largely overlooked. To be looked for in Italy.

Growth form: Lichenicolous fungus

Substrata: rocks

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

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