ITALIC 7.0

Protoparmeliopsis muralis var. dubyi (Müll. Arg.) Hafellner & Türk

Stapfia, 76: 157, 2001. Basionym: Lecanora dubyi Müll. Arg. - Bull. Soc. Hallerienne: 36, 1853.

Synonyms: Lecanora muralis subsp. dubyi (Müll. Arg.) Poelt

Distribution: N - Frl, Ven (Nascimbene & al. 2021), TAA (Calatayud & al. 2013, Nascimbene & al. 2022), Lomb (Valcuvia & Delucchi 2001, Valcuvia & al. 2003, Delucchi & Valcuvia 2004), Piem (Isocrono & al. 2004, Isocrono & Piervittori 2008), VA (Matteucci & al. 2008c), Emil (Valcuvia & Delucchi 2001, Calatayud & al. 2013, Fariselli & al. 2020). C - Laz (TSB 8049), Sar (Rizzi & al. 2011, Giordani & al. 2013). S - Camp, Si (Ottonello & al. 1994, 2011, Ottonello & Romano 1997).

Description: Thallus crustose-placodioid to subfoliose, episubstratic, rather loosely attached, yellowish green to grey-green, areolate in the center, lobed at margins, forming orbicular rosettes to 15 cm in diam. Lobes much longer than wide (5-10 mm long, 0.7-1.5 mm wide), flat to usually convex, contiguous, smooth, usually epruinose; central areoles often with a thin dark margin. Upper cortex 50-75 µm (or more) thick, inspersed with yellowish granules soluble in K and insoluble in N, overlain by an epinecral layer; medulla white, rather loose but never becoming hollow; lower cortex poorly developed, mostly confined to the tips or margins of lobes. Apothecia lecanorine, 0.8-2 mm across, sessile, with a flat, rather dark brown disc and a smooth, persistent thalline margin. Epithecium pale yellow to brown, with granular crystals not dissolving in K; hymenium colourless, 50-80 µm high, I+ blue; paraphyses coherent, mainly simple or sparingly branched in upper part, the apical cells only slightly swollen; hypothecium colourless to yellowish. Asci 8-spored, elongate-clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 8-15 x 4-7 µm. Conidia thread-like. Photobiont chlorococcoid. Spot tests: thallus K- or K+ very pale yellow, C-, KC-, P- or P+ pale yellow. Chemistry: cortex with usnic acid, medulla with zeorin, and different triterpenoids.

Note: on weakly calciferous or basic siliceous rocks in upland areas, with optimum near and above treeline. The var. schneebergensis (Zahlbr.) Hafellner & Türk is known from the Austrian Alps.

Growth form: Crustose placodiomorph

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rather common

Subalpine belt: common

Oromediterranean belt: rare

Montane belt: very rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

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5

(info)

Solar irradiation:

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5

(info)

Aridity:

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5

(info)

Eutrophication:

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(info)

Poleotolerance:

0

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(info)

Altitudinal distribution:

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6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 7730