ITALIC 8.0

Acarospora gallica H. Magn.

K. Svenska Vetensk.-Akad. Handl., ser. 3, 7, 4: 282, 1929.

Synonyms: Acarospora gallica var. devastata (Eitner) H. Magn.; Acarospora hungarica H. Magn.

Distribution: N - VG (Castello 2002, Martellos & Castello 2004), TAA (Nascimbene & al. 2021), Piem (TSB 34247), Emil (Nimis & al. 1996, Fariselli & al. 2020), Lig (Giordani & al. 2016). C - Tosc, Sar (CLU 4578)..

Description: Thallus crustose, episubstratic, of dispersed or contiguous areoles, pale yellowish brown to dark brown, epruinose, matt, forming up to 2 cm wide patches. Areoles 0.2-0.6(-1.5) mm wide, 0.2-0.5 mm thick, usually flat, angular to round, broadly attached, sometimes reduced to a thin rim around a single apothecium, becoming subsquamulose and lobulate in well-developed specimens; lower surface of well-developed areoles pale. Cortex (15-)20-35 μm thick, paraplectenchymatous, the upper layer brown, the lower layer colourless, without an epinecral layer; algal layer continuous, 50-100 µm thick; medulla white, up to 100 μm thick, of intricate, thick-walled hyphae. Apothecia 1-10(-12) per areole, 0.1-0.6(-0.8) mm across, with a usually smooth, brown (darker than thallus, reddish when wet), epruinose disc and an indistinct thalline margin. Proper exciple thin, to 10-15 μm wide; epithecium reddish brown, 10-20 μm high; hymenium colourless, 75-100 μm high, IKI+ red or blue; paraphyses 1.5-2 μm thick, mostly simple, the apical cells up to c. 3 μm wide; subhymenium usually 10-30(-50) μm high and IKI+ blue; hypothecium narrow, to 15 μm high, continuous with exciple. Asci 100-200-spored, clavate, the apical dome K/I-, 50-80 x 15-30 μm. Ascospores 1-celled, hyaline, narrowly to broadly ellipsoid, (2.5-)3.5-5(-6.5) x 1.5-2 μm. Pycnidia globose, usually visible as brown-red dots. Conidia hyaline, simple, mostly 2.5 x 1 μm. Photobiont chlorococcoid. Spot tests: cortex and/or medulla K-, C+ red, KC+ red, P-. Chemistry; gyrophoric and lecanoric acids.

Note: a probably holarctic species of base-rich, weakly calciferous siliceous substrata, such as calcareous sandstone, brick, and roofing tiles, usually at relatively low elevations; much overlooked or confused with other species and certainly more widespread in Italy. For further details see Knudsen & Kocourková (2012).

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: rare

Padanian area: absent

Humid submediterranean belt: rather rare

Humid mediterranean belt: 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; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (11365)
2001/12/12

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (32673)
2001/12/12