ITALIC 8.0

Megaspora verrucosa var. mutabilis (Ach.) Nimis & Cl. Roux

in Nimis, The Lichens of Italy: 430, 1993. Basionym: Urceolaria mutabilis Ach. - Lichenogr. Univ.: 335, 1810.

Synonyms: Aspicilia mutabilis (Ach.) Körb.; Lecanora mutabilis (Ach.) Nyl.; Pachyospora mutabilis (Ach.) A. Massal.; Patellaria mutabilis (Ach.) Trevis.; Pertusaria lapieana B. de Lesd.

Distribution: N - VG, Ven (Nascimbene & Caniglia 2000, 2003c), Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999), Emil (Fariselli & al. 2020). C - Tosc (Benesperi 2007), Marc (Nimis & Tretiach 1999), Umb (Ravera 1998, Ravera & al. 2006), Laz (Fornasier & al. 2005), Abr (Recchia & al. 1993, Olivieri & Pacioni 1995, Olivieri & al. 1997, 1997b, Loppi & al. 1999, Nimis & Tretiach 1999, Gheza & al. 2021), Mol (Nimis & Tretiach 1999, Caporale & al. 2008, Caporale & Ravera 2020). S - Cal (Puntillo 1995), Si (Grillo 1996, Campisi & al. 2020).

Description: Thallus crustose, whitish to brownish grey, usually warted, more or less densely white-pruinose, usually rather well-delimited. Apothecia frequent, lecanorine, immersed in thalline warts, up to 1.5 mm across (usually less), with a black, initially pore-like then expanded, concave to finally flat, rough but epruinose disc, the black colour expanding to the margin, forming a dark halo; thalline margin thick, smooth, whitish to grey, darker in inner part, pruinose. Thalline exciple with numerous small crystals; proper exciple thin, of strongly conglutinate, vertically aligned hyphae; epithecium olivaceous green to partly grey-black, N+ bright green, the darkest parts K+ brownish, without crystals; hymenium colourless, 80-120 µm high, I+ blue; paraphysoids coherent, branched and anastomosing, slender, c. 1.5 µm thick, the apical cells not markedly thickened; hypothecium colourless to yellowish. Asci (4-)8-spored, clavate or cylindrical-clavate, thin walled except towards the apex, with a K/I+ pale blue tholus, Biatora-type. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 34-60 x 22-42 µm, the wall 1.5-2.5 µm thick. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: Chemistry: thallus without lichen substances; apothecia with the Caesiocinerea-green pigment.

Note: on basal parts of old deciduous trees; most frequent in Central Italy; doubtfully distinct from the typical variety.

Growth form: Crustose

Substrata: bark

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: extremely rare

Oromediterranean belt: absent

Montane belt: rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: very rare

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

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 24376

P.L. Nimis CC BY-SA 4.0

TSB 24376