Lecanora rhizinata Poelt, Barreno & V.J. Rico

Lazaroa, 5: 255, 1983.
Distribution: C - Sar.
Description: Thallus crustose-subsquamulose, episubstratic, 5-30 mm wide, yellowish green, rarely yellowish brown in sun-forms, often with pinkish patches in the damaged parts. Areoles/squamules 0.5-3.5 x 0.6-2.4 mm, 0.5-1 mm thick, umbilicate, usually lobed, concave to convex, at first smooth, but soon turning rugose; lower surface at first whitish, then brown to black, with branched, up to 10 mm long, 0.1-0.4 mm wide, blackish, pale brown to pinkish rhizinose strands. Upper cortex 90-380 μm thick, prosoplectenchymatous, the upper part 30-60 μm thick, yellowish brown, filled with 0.5-4 x 0.5-1.5 μm large crystalline granules, with an epinecral layer, lower part colourless, without granules; algal layer discontinuous; medulla 30-45 μm thick, prosoplectenchymatous; lower cortex absent. Apothecia lecanorine, 1-4.5 mm across, often covering a large part of thallus, at first semi-immersed, then sessile and constricted at base to subpedicellate, with a slightly concave to slightly convex, yellowish brown to brown disc, and a 0.3-0.5 mm thick, persistent, often flexuose thalline margin. Thalline exciple 500-650 μm thick laterally, corticate, the outer part filled with crystals; proper exciple 15-20 μm thick; epithecium yellowish brown, 10-15 μm high, with small crystals (0.5-4 x 0,5-1.5 μm); hyménium colourless, 45-60 μm high, the upper part with sparse small crystals; paraphyses strongly coherent, sparingly branched and anastomosing, 1.5-2 μm thick at base, the apical cells 3-4.5 μm wide; hypothecium 70-135 μm high, prosoplectenchymatous. 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, eelipsoid to broadly ellipsoid, rather thick-walled (8-)9.5-12.5(-14.5) x (4.5-)5-7(-7.5) μm. Pycnidia colourless, immersed. Conidia needle-like, slightly curved, 17-28 x 0.5-1 μm. Photobiont chlorococcoid. Spot tests: cortex and apothecial margin K- or K+ pale yellow, C-, KC+ pale yellow, P-; medulla K-, C-, KC-, P-; pinkish parts K + reddish violet. Chemistry: usnic acid, plus an unidentified pigment in the pink-coloured parts.
Note: on easily exfoliable metamorphic rocks in open, wind-exposed and snow-free sites above treeline.
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: extremely 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:


Solar irradiation:








Altitudinal distribution:


Predictive model

P.L. Nimis CC BY-SA 04
TSB 8203

Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 8203

P.L. Nimis CC BY-SA 4.0
TSB 8203

P.L. Nimis CC BY-SA 04
TSB 8203


Poelt, J/ Barreno, E/ Rico, VJ (1983) Lecanora rhizinata spec. nova, liquen taxonomicamente aislado, sobre fisuras de rocas exfoliables, en Espana. Lazaroa http://revistas.ucm.es/portal/modulos.php?name=Revistas2_Historico&id=LAZA&num=LAZA090911

Sanders, WB/ Ascaso, C (1997) Fine structural features of rhizomorphs (sensu lato) produced by four species of lichen fungi. Mycological Research

C. Roux (2009) Presence de Lecanora rhizinata Poelt, Barreno et Rico au mont Aigoual (SE de la France). Bulletin d'Informations de l'Association Française de Lichenologie