ITALIC 8.0

Polyblastia singularis (Kremp.) Arnold

Verh. zool.-bot. Ges. Wien, 18: 949, 1868.. Basionym: Verrucaria singularis Kremp. - Denkschr. kgl. bayer. bot. Ges., Abt. 2, 4: 291, 1861.

Synonyms:

Distribution: N - TAA (Dalla Torre & Sarnthein 1902, Nascimbene & al. 2022, Breuss 2024).

Description: Thallus crustose, thinly episubstratic, continuous to usually rimose, whitish, grey-brown or ochraceous, sometimes poorly evident, rarely delimited by a black prothallus. Hyphae of the algal layer not oriented vertically. Perithecia black, numerous, immersed in the thallus, the visible part 0.13-0.18 mm across. Involucrellum well-developed, more or less dimidiate, clearly distinct from exciple except in the ostiolar region; exciple pale brown throughout, merged with the involucrellum in the uppermost part, pseudoparenchymatous; hamathecium of periphyses and periphysoids, interascal filaments absent; periphysoids 16-23 μm long and 1.5-2 μm thick, sparingly branched in the uppermost part; hymenial gel I+ red, K/I+ blue. Asci 8-spored, clavate, K/I-, fissitunicate, the wall thickened above, with a broad ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum. Ascospores submuriform, with 1-2 oblique septa arranged crosswise, 4-6(-8)-celled in optical view, hyaline, subglobose, (9-)10-15(-16) x 7.5‒10 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on dolomite and limestone near and above treeline; not always distinguished from P. plicata, with several scattered records in Central Europe; to be looked for further in the Italian Alps.

Growth form: Crustose endolithic

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

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

Source: Sanja Savic & Leif Tibell. 2012. Polyblastia in Northern Europe and the adjacent Arctic. Symb. Bot. Upsal. 36,1.

Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain