ITALIC 7.0

Squamarina periculosa (Schaer.) Poelt

Mitt. bot. Staatss. München, 2: 534, 1958. Basionym: Lecanora crassa var. periculosa Dufour ex Schaer. - Enum. Crit. Lich. Eur.: 58, 1850.

Synonyms: Placolecanora crassa var. tricolor B. de Lesd.

Distribution: N - VG, Frl (Martellos 2005), TAA, Lomb, Piem (TSB 33149), VA (Piervittori & Isocrono 1999), Lig. C - Tosc (Benesperi 2007), Sar. S - Camp (Altieri & al. 2000, Roccardi & Ricci 2006), Cal (Puntillo 1996).

Description: Thallus subcrustose to squamulose, very thick (to 6 mm), pale yellowish green but usually thinly white-pruinose, forming large, more or less regular up to more than 10 cm wide rosettes. Marginal squamules flattened, slightly elongated c. 2-3 mm long, central ones convex, irregularly imbricate and often subcrustose-areolate. Upper cortex paraplectenchymatous; medulla white, very thick. Apothecia frequent, lecanorine, to 8 mm across, with a thick, prominent, persistent, strongly pruinose thalline margin, a well-differentiated proper margin and a more or less flat, greenish to pale ochraceous, sometimes yellowish- to bluish-pruinose disc. Epithecium granular, 5-10 μm thick; hymenium colourless, c. 50 μm high, I+ blue; hypothecium colourless. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue, the wall I-, but the thin outer gel I+ blue, Bacidia-type. Ascospores 1-celled, hyaline, ellipsoid, 10.5-18 x 4.5-6 μm. Pycnidia common and often abundant, immersed. Conidia filiform, curved. Photobiont chlorococcoid. Spot tests: upper cortex K-, C-, KC- or KC+ yellowish, P-; apothecial margin P- or rarely P+ yellowish. Chemistry: usnic acid (cortex).

Note: in fissures of steeply inclined surfaces of calciferous rocks, with optimum in lowland areas.

Growth form: Squamulose

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: extremely rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: very 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

Index Fungorum GBIF

P.L. Nimis CC BY-SA 04

TSB 18144

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

Herbarium: TSB (18144)
2001/12/11
apothecium

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

Herbarium: TSB (18144)
2001/12/11
upper surface with pycnidia

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

Herbarium: TSB (18144)
2001/12/11

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Squamarina_periculosa.htm

France, session AFL 2010 - Hérault

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Squamarina_periculosa.htm

France, session AFL 2010 - Hérault

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Squamarina_periculosa.htm

France, session AFL 2010 - Hérault

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Squamarina_periculosa.htm

France, session AFL 2010 - Hérault