ITALIC 8.0

Pyrenocarpon montinii (A. Massal.) Trevis.

Riv. Accad. Padova, 3: 49, 1855. Basionym: Thelochroa montinii A. Massal. - Symmicta Lich.: 86, 1855.

Synonyms: Porocyphus montinii (A. Massal.) Arnold; Psorotichia montinii (A. Massal.) Forssell; Psorotichia recondita Arnold

Distribution: N - VG, Frl (TSB 16802), Ven (Lazzarin 2000b), TAA (Schultz 2014), Lig (Watson 2014). C - Laz (Bartoli & al. 1998), Abr. S - Pugl (Nimis & Tretiach 1999), Si (Nimis & al. 1994).

Description: Thallus crustose, homoiomerous, 50-65 µm thick, minutely granulose to almost powdery, usually forming 1-2(-3) mm wide, orbicular patches, rarely somewhat spreading. Granules 0.1-0.3(-0.4) mm wide, diffuse or densely aggregated, blackish when dry, dark olive-brown and weakly subgelatinous when wet. Thallus anatomy paraplectenchymatous, with a loose network of more or less isodiametric, 2-3 µm wide cells enclosing the photobiont cells. Apothecia very small, 0.1-0.2(-0.3) mm across, with an initially punctiform but soon expanded, dark orange-brown, concave disc and a shallow to prominent, persisting, sometimes granulose thalline margin. Proper exciple cupuliform, prosoplectenchymatous, very thin (to 10 µm wide); epithecium orange-brown, up to 15 µm high, K-; hymenium colourless, 70-90 µm high, I+ blue; paraphyses branched and anastomosing, slightly constricted at septa, 2-3 µm thick. Asci 8-spored, narrowly clavate, rather thick-walled, without internal amyloid structures, 50-60 x 11-20 µm. Ascospores 1-celled, hyaline, thin-walled, subglobose to broadly ellipsoid, 8-15 x 5-9 µm. Photobiont cyanobacterial, chroococcoid, of a few cells penetrated by haustoria, measuring 6-13 x 4-7 µm, surrounded by a gelatinous sheath which is yellowish brown near the thallus surface. Spot tests: all negative. Chemistry: without lichen substances.

Note: a mainly southern species found on steeply inclined, south-exposed seepage tracks of calcareous rocks, sometimes invading the thalli of endolithic lichens, especially Bagliettoa-species; certainly more widespread.

Growth form: Crustose

Substrata: rocks

Photobiont: cyanobacteria, coccaceous (e.g. Gloeocapsa)

Reproductive strategy: mainly sexual

On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: rare

Padanian area: absent

Humid submediterranean belt: rare

Humid mediterranean belt: rather rare

Dry mediterranean belt: extremely 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 CC BY-SA 04

TSB 16802

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

Herbarium: TSB (16802)
2001/12/11
thallus with apothecia

P.L. Nimis CC BY-SA 4.0

TSB 16802