ITALIC 7.0

Acarospora murorum A. Massal.

Mem. Lichenogr.: 130, 1853.

Synonyms: Acarospora dolophana (Nyl.) H. Magn.; Acarospora macrospora subsp. murorum (A. Massal.) Clauzade & Cl. Roux; Acarospora macrospora var. murorum (A. Massal.) Anzi; Acarospora truncata (A. Massal.) A. Massal.; Biatorella truncata A. Massal.

Distribution: N - VG, Frl. Ven (Lazzarin 2000b), TAA, Lomb, Piem (Isocrono & al. 2003), Emil (Fariselli & al. 2020), Lig (Valcuvia & al. 2000, Watson 2014). C - Tosc, Umb (Genovesi & Ravera 2001, Ravera & al. 2006), Laz (Roccardi 2003), Abr (Nimis & Tretiach 1999), Mol (Ravera & Genovesi 2012, Genovesi & Ravera 2014), S - Si.

Description: Thallus crustose, episubstratic, continuous to areolate, indeterminate, sometimes pruinose, pale brown to sand-coloured when dry, bright green when wet. Areoles 0.7-1.5(-2) mm wide, flat, irregularly rounded or angular, the underside white. Algal layer 40-70 μm thick, irregularly interrupted by perpendicular strands of medullary hyphae; medulla white in upper part, brownish in lower part. Apothecia lecanorine, 0.5-1 mm across, usually 1 per areole, immersed, with a red-brown to dark brown (darker than thallus), concave to flat disc, and a rather prominent thalline margin. Proper exciple colourless, 15-20 μm thick at the base, expanding in upper part; epithecium yellowish brown; hymenium colourless, 100-160 μm high, K/I+ blue; paraphyses coherent, septate, 2-3 μm thick at base, the apical cells 3-5 μm wide; hypothecium colourless. Asci 30-100-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, ellipsoid, 6-13 x 3-6 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a mild-temperate species, most frequent on walls, gravestones, and monuments below the subalpine belt. Related to A. macrospora, but with a different ecology and altitudinal distribution. The correct name may prove to be A. truncata (A. Massal.) A. Massal. (Arcadia 2016).

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: extremely rare

Submediterranean belt: rare

Padanian area: very rare

Humid submediterranean belt: rare

Humid mediterranean belt: very 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

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 10950

P.L. Nimis CC BY-SA 4.0

TSB 10950