ITALIC 8.0

Acarospora insolata H. Magn.

Göteb. Vetensk.-och Vitter.-Handl., ser. 4, 28, 2: 112, 1924.

Synonyms:

Distribution: N - Ven, Piem (LD -1549228), Emil (Fariselli & al. 2020). C - Tosc, Sar (Rizzi & al. 2011). S - Bas (Nimis & Tretiach 1999).

Description: Thallus crustose-subsquamulose, episubstratic areolate, medium brown, shiny, forming small patches, usually developing on the thalli of other crustose lichens. Areoles angular or rounded, slightly convex, 0.4-1.5(-3) x 0.3-2.4 mm, finely subdivided into smaller units by a dense network of fissures, dispersed or aggregated into small groups amongst the areoles of the host; lower surface black, visible along the margins. Cortex 20-30(-50) μm thick, overlain with a to 15 μm thick amorphous layer, the cortical cells 2-3 μm wide; algal layer continuous; medulla white, without crystals. Apothecia 0.2-0.4 mm across, immersed in the areoles, (2-)5-12 per areole, often confluent and poorly developed, round to elongate, with an initially concave, then flat, reddish brown disc, and a more or less prominent, sometimes indistinct thalline margin. Proper exciple thin, poorly developed; epithecium brown; hymenium colourless, 50-60(-80) μm high, euamyloid, IKI+ persistently blue; paraphyses stout, 2-2.5 μm thick at base, the apical cells to c. 3 μm wide; subhymenium and hypothecium colourless. Asci c. 100-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, broadly ellipsoid, 3-5 x 2-3.5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on inclined faces of siliceous rocks wetted by rain, usually parasitic on crustose lichens, especially Rhizocarpon and Immersaria. Probably more widespread in the mountains, especially in the Alps. The species does not belong to Acarospora s.str. (Westberg & al. 2015).

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

paras Immersaria and Rhizocarpon spp.

Commonnes-rarity: (info)

Alpine belt: rather rare

Subalpine belt: rare

Oromediterranean belt: very rare

Montane belt: very rare

Submediterranean belt: extremely 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

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 29925

Magnusson A. H. (1935) Acarosporaceae, Thelocarpaceae. - In: Rabenhorst G. L.: Kryptogamen-Flora von Deutschland, Österreich, und der Schweiz-. 2nd- IX. Die Flechten. Abt. 5- 1. Gebr. Borntraeger. Leipzig, pp. 1-318. – Public Domain

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

Herbarium: TSB (29925)
2001/12/12
on the host, Aspicilia sp.