ITALIC 8.0

Diplotomma lutosum A. Massal.

Miscell. Lichenol.: 41, 1856.

Synonyms: Buellia lutosa (A. Massal.) Anzi

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

Description: Thallus crustose, episubstratic, rather thick, whitish to dirty yellowish brown, areolate, the areoles irregular in outline, flat to slightly convex, separated by deep cracks. Medulla white, I+ blue. Apothecia lecideine, black, 0.3-0.8(-1) mm across, subimmersed to subsessile, with a soon convex, usually epruinose disc, and a soon excluded proper margin. Proper exciple brown in outer part, paler within; epithecium brown; hymenium colourless, K/I+ blue; paraphyses simple, slightly capitate; hypothecium pale to dark brown. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass), the wall I-, but the thin outer gel I+ blue, approaching the Bacidia-type. Ascospores 3-septate, brown, ellipsoid, slightly curved and bean-shaped, 10-16 x 3-6 μm, with a minutely verrucose ornamentation more evident at both ends. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: an apparently widespread but rare, or at least rarely distinguished, silicicolous species characterised by ornamented, four-celled spores with transverse septa only, and by the I+ blue reaction of the medulla. It is very closely related to (and often synonymized with) the calcicolous D. dispersum, which differs in the less evidently ornamented spores and in the ecology.

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: rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: extremely rare

Humid mediterranean belt: extremely rare

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

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6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF