ITALIC 8.0

Acarospora rehmii H. Magn.

K. svenska Vetensk-Akad. Handl., ny föl. 7, 4: 185, 1929

Synonyms: Acarospora tongletii f. rehmii (H. Magn.) Clauzade & Cl. Roux

Distribution: N - VG (Magnusson 1936).

Description: Thallus crustose, episubstratic, rimose-areolate, well delimited, whitish, grey to yellowish brown, the areoles small, usually not well-visible because hidden by the numerous apothecia. Algal layer discontinuous, interrupted by vertically oriented hyphal bundles. Apothecia lecanorine, 0.2-0.6 mm across, 1-3(-5) per areole, at first immersed, then more or less projecting, round to angular or slightly elongated, sometimes confluent, with a concave, smooth to slightly rugose, dark brown disc and a prominent, entire thalline margin. Epithecium yellowish brown, K-; hymenium colourless, 60-120(-130) μm high; paraphyses 1.5-2(-2.5) μm thick at base, the apical cells 3-5 μm wide; hypothecium colourless, K-. Asci 100-200-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, ellipsoid to subcylindrical, 3-6.5 x 1.5-2 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV. Chemistry: without lichen substances.

Note: This is a distinct species according to Knudsen & Kocourková (2020), differing from A. paupera in the absence of norstictic acid. It grows on calciferous sandstone below the montane belt, and it might be more widespread in Italy.

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: absent

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: absent

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

Index Fungorum GBIF

Elena Pittao CC BY-SA 4.0; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (2272)

Elena Pittao CC BY-SA 4.0; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (2272)