ITALIC 7.0

Acarospora hilaris (Nyl.) Hue

Nouv. Arch. Mus. Hist. Nat., sér. 5 1: 113, 1909. Basionym: Lecanora hilaris Dufour ex Nyl. - Not. Sallsk. Fauna Fl. Fenn. Förh., 5: 177, 1861.

Synonyms: Placodium chlorophanum var. hilare (Dufour) Boistel

Distribution: C - Tosc (Tretiach 1993), Sar (Tretiach 1993). S - Cal (Puntillo 1996), Si (Nimis & al. 1996b, Grillo & Caniglia 2004).

Description: Thallus crustose-placodioid, episubstratic, bright lemon yellow, slightly glossy, epruinose, forming orbicular to irregular, often confluent rosettes covering wide surfaces. Central parts of thallus of contiguous, angular, flat to slightly convex areoles; marginal lobes radiating, flat or very slightly convex, 1-2(-4) x 0.3-0.6(-1) mm. Medulla white; algal layer continuous. Apothecia lecanorine, immersed in the areoles (1-3 per areole), with a punctiform, dark brown disc and a poorly evident thalline margin. Epithecium brownish; hymenium colourless, 85-100 µm high; paraphyses 1.5-2 µm thick at base, the apical cells hardly wider; hypothecium colourless. Asci 100-200-spored, broadly ellipsoid, the apical dome K/I-. Ascospores 1-celled, hyaline, ellipsoid, 3-6 x c. 2 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: cortex with rhizocarpic acid.

Note: a xeric subtropical species found on vertical to underhanging faces of hard siliceous rocks which are rarely wetted by rain, restricted to the driest parts of Mediterranean Italy. Chemically heterogeneous (epanorin or rhizocarpic acid).

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)

In underhangs rarely wetted by rain

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: extremely rare

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

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

Herbarium: TSB (20400)
2001/11/20

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

Herbarium: TSB (20400)
2001/12/22

Domenico Puntillo; Owner: Domenico Puntillo

Italy, Herb. Puntillo 12968