ITALIC 8.0

Caloplaca sarda Poelt & Nimis

in Nimis & Poelt, Studia Geobot., 7, suppl. 1: 73, 1987.

Synonyms:

Distribution: C - Sar.

Description: Thallus crustose, episubstratic, pale orange, rimose-areolate, rather thick, forming small, compact, sometimes confluent, up to 5 mm wide patches. Areoles flat, angular, 0.2-0.5 mm in diam. Thallus subparaplectenchymatous throughout, with angular, thick-walled cells; in the algal-free lower medulla they measure 3-6 μm, in the cortex they are horizontally elongate and may reach up to 8 μm. Apothecia orange, one to two per areole, completely immersed in the areoles or weakly emerging, in which case a thin proper margin is evident, otherwise immarginate, with a flat disc. Proper exciple radially expanded at margin, subparaplectenchymatous, with strongly conglutinated-swollen hyphae; epithecium orange-brown, K+ purple-red; hymenium colourless, c. 50 μm high: paraphyses strongly conglutinated, 2-2.5 μm thick at base, the apical cells only slightly thicker, and (in water) difficult to distinguish, becoming free in K. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, mostly poorly developed or only partially ripe, broadly ellipsoid, c. 11-12 x 6.5-8.5 μm, the equatorial thickening (“septum”) 2.5-3 μm at maturity. Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ purple-red, C-, KC-, P-. Chemistry: thallus and apothecia with unidentified anthraquinones.

Note: a very peculiar species, hitherto known only from the type locality, on basic siliceous rocks in a dry internal valley of central Sardinia.

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: very rare

Submediterranean belt: extremely 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

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 14723