Pannaria hookeri (Sm.) Nyl.

Mém. Soc. Imp. Sc. Nat. Cherbourg, 5: 109, 1858. Basionym: Lichen hookeri Borrer ex Sm. in Smith & Sowerby - English Bot., 32: 2283, 1811.
Synonyms: Pannaria glacialis Anzi; Pannaria hookeri var. macrior Th. Fr.; Pannaria leucolepis (Wahlenb.) Nyl.
Distribution: N - Frl (Tretiach & Hafellner 2000), TAA, Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999).
Description: Thallus crustose-placodioid to subfoliose, heteromerous, dorsiventral, forming adpressed, up to 3 cm wide rosettes developing on a black, diffuse, thin prothallus. Squamules flat to convex, 0.3-1 mm wide, dispersed to overlapping, tightly adnate or loosely attached, irregularly rhomboid, delimited by deep cracks and often wart-like in thallus centre, more or less effigurate and spathulate at margins, the marginal ones to 3 mm wide and 0.2-0.3 mm thick. Upper surface pale brownish grey to bluish grey, more or less scabrid-maculate and faintly whitish-striate, especially at margins. Upper cortex paraplectenchymatous, small-celled, 40-60 μm thick; medulla white; lower cortex absent. Apothecia common, lecanorine, 0.4-1.5(-2) mm across, scattered, constricted at base, with a black or rarely dark brown, at first flat then often convex, rough disc, and a crenulate, somewhat inrolled, whitish thalline margin. Proper exciple very thin, brown, prosoplectenchymatous; epithecium blue-green to green-black; hymenium colourless or partially brown-red, 100-200 µm high, hemiamyloid, I+ reddish brown, K/I+ blue; paraphyses mostly simple, the apical cells hardly swollen; hypothecium colourless to yellowish. Asci 8-spored (but often with a few aborted ascospores), clavate, with a well developed, non-amyloid or very weakly amyloid tholus lacking internal structures, and an intensely amyloid, thin outer sheath. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, (10-)12-15(-18) x (6-)8-11 μm, smooth- and thick-walled. Photobiont cyanobacterial, (Nostoc, the cells in clusters). Spot tests: thallus K-, C-, KC-, P- or P+ faintly orange. Chemistry: with variable,often low amounts of pannarin.
Note: on slightly calciferous soil (mostly deriving from metamorphic rocks) in sites with periodical water seepage, sometimes also directly on rock, with optimum near treeline; probably restricted to the Alps in Italy.
Growth form: Squamulose
Substrata: rocks, soil, terricolous mosses, and plant debris
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: 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
Herbarium samples


P.L. Nimis CC BY-SA 4.0
TSB 21124



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21124)
2001/11/28



Pier Luigi Nimis - CC BY-SA 4.0
TSB 21124



Pier Luigi Nimis - CC BY-SA 4.0
TSB 21124



Pier Luigi Nimis - CC BY-SA 4.0
TSB 21124



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21124)
2001/11/28



Pier Luigi Nimis - CC BY-SA 4.0
TSB 21124



Pier Luigi Nimis - CC BY-SA 4.0
TSB 21124