ITALIC 8.0

Dermatocarpon leptophyllum (Ach.) K.G.W. Lång

Acta Soc. Fauna Fl. Fenn., 34, 3: 42, 1912. Basionym: Lichen leptophyllus Ach. - Lichenogr. Suec. Prodr.: 141, 1799.

Synonyms:

Distribution: N - Ven, TAA, Lomb. C - Tosc. S - Camp.

Description: Thallus foliose-umbilicate, monophyllous or of a few connected lobes, rather thin (0.2-0.5 mm thick when dry), attached by one or rarely a few central holdfasts. Lobes usually concave (5-)7-18(-25) mm wide. Upper surface grey to almost black in parts, epruinose or only partially pruinose; lower surface smooth to partly verrucose. Upper cortex (40-)50- 90(-110) μm thick, brown in the uppermost part, with an epinecral layer of air-filled hyphae; medulla consisting of c. 3 μm thick hyphae; lower cortex (30-)40-60(-70) μm thick, the outermost part brown, consisting of 5-8 cell layers; crystals visible in polarized light and soluble in K present in the lower cortex. Perithecia dark brown to black, immersed, with a slightly protruding ostiole, more or less spherical, without involucrellum, the wall colourless except in the brown uppermost part. Hamathecium or periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type, with more or less uniseriately arranged ascospores. Ascospores 1-celled, hyaline, narrowly ellipsoid, 7-10.5(-11.5) x 4.5-6(-6.5) µm. Pycnidia very rare, black. Conidia 5-6 x c. 1 μm. Photobiont chlorococcoid. Spot tests: cortex and and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a species of the D. miniatum group with umbilicate thalli usually provided with blackish grey concave lobes, and narrowly ellipsoid (Thüs, in litt., while most descriptions state that they are broadly ellipsoid to subglobose), uniseriate ascospores in cylindrical asci, found on horizontal or depressed rock faces of limestone in seasonally wet places. Most of the Italian records are old and require re-confirmation (see Nimis 1993: 274).

Growth form: Foliose, umbilicate

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

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

2

3

4

5

6

(info)

Predictive model

Leif Stridvall (Courtesy Anita Stridvall) - Source: http://www.stridvall.se/lichens/gallery/Dermatocarpon

Leif Stridvall (Courtesy Anita Stridvall) - Source: http://www.stridvall.se/lichens/gallery/Dermatocarpon

Leif Stridvall (Courtesy Anita Stridvall) - Source: http://www.stridvall.se/lichens/gallery/Dermatocarpon

Leif Stridvall (Courtesy Anita Stridvall) - Source: http://www.stridvall.se/lichens/gallery/Dermatocarpon