Lecanora swartzii subsp. nylanderi (Räsänen) Leuckert & Poelt

Nova Hedwigia, 49: 162, 1989. Basionym: Lecanora subradiosa var. nylanderi Räsänen - Ann. Bot. Soc. Zool.-Bot. Fenn. Vanamo, 12, 1: 70, 1939.
Distribution: S - Cal (Puntillo 1996).
Description: Thallus crustose, episubstratic, rimose to verrucose-areolate, yellowish green, often delimited by a white, more or less arachnoid prothallus, usually subplacodioid. Areoles flat to strongly convex, thick, ecorticate. Apothecia lecanorine, constricted at base to almost stalked, 0.3-1.5 mm across with a brown or grey-brown, but heavily white- or bluish grey-pruinose, flat to convex disc, and a thin, even, smooth thalline margin, without an inner parathecial ring. Thalline exciple with an algal-free, strongly conglutinate eucortex and a more or less loose medullar plectenchyma in inner parts; pproper exciple colourless, containing crystals soluble in K; epithecium brown to dark brown, with crystals, the pigment and the crystals dissolving in K; hymenium colourless; paraphyses slightly thickened at tips; hypothecium colourless. Asci 8-spored, 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 blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 9-14 x 6-7.5 µm. Photobiont chlorococcoid. Spot tests: thallus and thalline margin of apothecia K+ yellow, C+ orange, KC+ orange, P+ pale yellow; apothecial disc (pruina) C+ yellow-orange, KC+ orange. Chemistry: atranorin (major), arthotelin (with thiophanic acid and dichlornorlichexanthone), sometimes roccellic acid.
Note: on steeply inclined to underhanging surfaces of siliceous rocks, with optimum near and above treeline; known from the Mediterranean mountains, to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: very rare
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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Altitudinal distribution:


Predictive model