ITALIC 8.0

Protoparmeliopsis macrocyclos (H. Magn.) Moberg & R. Sant.

in Santesson & al., Lichen-forming and lichenicolous fungi of Fennoscandia: 269, 2004. Basionym: Lecanora muralis var. macrocyclos H. Magn. - Bot. Not.: 115, 1929.

Synonyms: Lecanora macrocyclos (H. Magn.) Degel.; Lecanora muralis subsp. macrocyclos (H. Magn.) Clauzade & Cl. Roux

Distribution: N - Ven, Emil (Fariselli & al. 2020).

Description: Thallus crustose-placodioid, episubstratic, 1-2 mm thick, yellowish green to grey-green, sometimes darker in central parts, usually epruinose, smooth and somewhat shiny, distinctly areolate in central parts, lobed at margins, forming orbicular rosettes to 20 cm in diam. Lobes to 5(-10) mm long, 0.5-1.5 mm wide, flat to weakly convex, contiguous to sometimes overlapping, much branched; central areoles flat, angular, 1-2 mm wide, often becoming short- and thin-lobed, giving the thallus an almost panniform appearance; lower surface corticate, dull whitish to pale brown. Upper cortex 50-75 µm (or more) thick, overlain by an epinecral layer; medulla white, rather loose; lower cortex poorly developed, mostly confined to the tips or margins of lobes. Apothecia usually scarce, lecanorine, 1-1.5(-2) mm across, sessile, with a flat to convex, brown disc and a smooth to crenulate, persistent thalline margin. Epithecium pale yellow to brown, with granular crystals not dissolving in K; hymenium colourless, 60-80 µm high, I+ blue; paraphyses coherent, mainly simple or sparingly branched in upper part, the apices only scarcely 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, 9-12 x 5-6 µm. 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: an arctic-alpine, silicicolous member of the difficult P. muralis-complex, which needs further study. For further details see Timdal (1987).

Growth form: Crustose placodiomorph

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: extremely 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:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Index Fungorum GBIF

Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php