Diplotomma lutosum A. Massal.

Miscell. Lichenol.: 41, 1856.
Synonyms: Buellia lutosa (A. Massal.) Anzi; Buellia subdispersa Mig.; Diplotomma subdispersa (Mig.) Etayo & Breuss
Distribution: N - Frl (TSB 15363), Lomb, Piem (TSB 25801). C - Tosc.
Description: Thallus crustose, episubstratic, brownish to yellowish grey, areolate. Medulla white, amyloid I+ blue. Apothecia lecideine, black, 0.3-0.6 mm across, subsessile, with a soon convex, heavily white-pruinose disc, and a soon excluded proper margin. Epithecium brown; hymenium colourless; paraphyses simple, slightly capitate. Asci 8-spored, clavate, with a thick apex, amyloid, with a distinct axial mass, Lecanora-type. Ascospores 3-septate, brown, ellipsoid, 10-15 x 3-5 μm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: no lichen substances.
Note: an apparently widespread but rare, or at least rarely distinguished, mostly silicicolous species, characterised by four-celled spores with transversal septa only, and by the J+blue reaction of the medulla.
Growth form: Crustose
Substrata: rocks
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: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: very rare
Dry mediterranean belt: absent


pH of the substrata:

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5

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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P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (8271)
2003/03/17