ITALIC 8.0

Thelidium dactyloideum Arnold

in Głowacki, Verh. Kaiserl.-Königl. zool.-bot. Ges. Wien, 20: 461, 1870.

Synonyms:

Distribution:

Description: Thallus crustose, endosubstratic or thinly episubstratic, whitish to brownish. Perithecia black, very small, largely immersed and slightly projecting only with the ostiolar region. Exciple carbonaceous. Asci 8-spored. Ascospores at first 1-septate, then 3(-5)-septate, at first hyaline, then turning brownish, dactyliform, 36-44 x 2-4 μm, with obtuse ends. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: unknown, probably without lichen substances.

Note: a very poorly understood calcicolous species, characterised by the dactyliform ascospores turning brown at maturity, only known from the Eastern Alps (Slovenia), in the montane belt, which most probably is quite unrelated to Thelidium. To be looked for in Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

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