Acarospora tominiana H. Magn.

K. Svenska Vetensk.-Akad. Handl., ser. 3, 7, 4: 216, 1929.
Synonyms:
Distribution: C - Sar.
Description: Thallus crustose, episubstratic, areolate, brown, developing on the thalli of Circinaria calcarea and related species on calcareous rocks. Areoles scattered or most often contiguous and clustered, forming dark islands on the thallus of the host, 0.4-0.7(-1) mm wide, round to angular, often with a whitish margin; lower surface pale brown. Upper cortex 30-40 µm thick, reddish brown in upper part; algal layer even, continuous. Apothecia aspicilioid, mostly round, 0.2-0.5 mm across, immersed in the areoles, 1(-3) per areole, with a concave, smooth disc, and a slightly raised thalline margin. Epithecium brownish; hymenium colourless, 85-100 µm high, I+ dark blue; paraphyses coherent, 1.5-2(-2.5) µm thick at base, the apical cells slightly swollen, 3-4 µm wide. Asci c. 100-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 3-4 x 2-2.5 µm. Photobiont chlorococcoid. Spot tests: upper cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a xeric subtropical species described from Central Asia, only known from a single station in Italy, on limestone in a very sunny and dry situation. The Italian record - the only one from Europe - needs reconfirmation.
Growth form: Crustose placodiomorph
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 Aspicilia spp.

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent


pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Poleotolerance:

(info)

0

1

2

3

Altitudinal distribution:

(info)

1

2

3

4

5





P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16656)
2001/12/12
on the host, Aspicilia sp., identification (by J. Poelt) uncertain



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.)



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.)



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.)



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).



Felix Schumm - CC BY-SA 4.0
[TSB_16656], Italy, Sardegna, Prov. Nuoro, Arcu Genna Cruxi, S of Dorgali on the road to Lanusei, c. 1080 m, on Aspicilia calcarea. Leg. P.L. Nimis & M. Tretiach, 03.09.1989, det. J. Poelt (sec.descr.).