ITALIC 8.0

Acarospora epithallina H. Magn.

K. Svenska Vetensk.-Akad. Handl., ser. 3, 7, 4: 72, 1929.

Synonyms:

Distribution: C - Sar. S - Si.

Description: Thallus crustose-subsquamulose, episubstratic, consisting of a few, scattered to clustered, yellow to ochre-yellow, rounded to angular, strongly convex (but flattened or concave at top), 0.5-5 mm wide, 0.4-0.8 mm thick areoles/squamules developing on the thalli of Acarospora hilaris, rarely appearing autonomous due to the death of the host. Upper cortex 120-140 µm thick; algal layer uneven, interrupted by hyphal bundles; medulla white. Apothecia lecanorine-aspicilioid, 1-2(-4) per areole, at first punctiform, then expanded, round to elliptical in outline, 0.2-2 mm across, with a ochre-yellowish disc and a weakly prominent thalline margin. Epithecium yellowish; hymenium colourless 100-130 µm high, the hymenial gel hemiamyloid, K/I+ light blue fading to light red; paraphyses c. 2 µm thick at base, the apical cells hardly swollen; hypothecium colourless. Asci 100-200-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, globose, 3-4 µm wide. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV+ orange. Chemistry: rhizocarpic acid.

Note: on steeply inclined, sunny surfaces of hard siliceous rocks, especially quartzite, on the thalli of A. hilaris. The species, reported from Macaronesia to Turkey, in Italy is much less frequent than its host, being restricted to the driest parts of the Mediterranean Region.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

paras Acarospora hilaris

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: very rare

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 (35719)
2003/01/22
on the host, Acarospora hilaris

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

Herbarium: TSB (5178)
2001/11/20