Lecanora expersa Nyl.

Flora, 58: 443, 1875.
Synonyms: Lecanora elisa Nyl.; Lecanora raesaenenii Gyeln.
Description: Thallus crustose, whitish grey to pale greenish brown, thin, usually slightly pustulate to areolate-cracked, sometimes delimited by a black prothallus, sorediate. Soralia maculiform, rounded, whitish to yellowish white, distinctly paler than thallus, flat or concave when young, convex when old, 0.2-0.8 mm across, often delimited by a thalline rim; soredia farinose, 20-40(-50) μm thick. Apothecia rarely present, lecanorine, sessile or immersed when young, 0.3-0.6 mm across, solitary or in small clusters, sometimes confluent, with a pinkish brown to brown-black, flat to convex, often finely pruinose disc, and a flexuose, uneven, finally often excluded thalline margin. Thalline exciple with a few large crystals visible under polarized light (sometimes lacking), indistinctly corticate or with a up to 40 µm thick cortex at base; epithecium orange-brown to brown, with sparse coarse crystals dissolving in K and in N, located on the tips of paraphyses; hymenium colourless, 40-100 μm high; paraphyses branched, c. 2 µm thick ant mid-level, the apical cells only slightly swollen or to 4 µm wide; 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, 7-11 x 4-6 um. Pycnidia brown to brown-grey. Conidia filiform, straight to curved, 15-25 x 1-1.2 μm. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ slowly and faintly yellow. Chemistry: atranorin, nephrosteranic acid, sometimes roccellic acid and unidentified fatty acids.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Montane belt: absent
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent

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Rarity

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P.L. Nimis CC BY-SA 04
TSB 33861


P.L. Nimis CC BY-SA 4.0
TSB 33861


Felix Schumm - CC BY-SA 4.0
[VZR442], Montenegro. Montes Durmitor, silva virginea supra lacum "Zminje jezero", loco Surdup dicto, 1500-1700 m. Ad corticem arborum. Leg. A. Vezda, 21.8.1984, det. T. Toensberg. Ex A. Vezda: Lichenes Rariores Exsiccati Nr. 442.


Felix Schumm - CC BY-SA 4.0
[VZR442], Montenegro. Montes Durmitor, silva virginea supra lacum "Zminje jezero", loco Surdup dicto, 1500-1700 m. Ad corticem arborum. Leg. A. Vezda, 21.8.1984, det. T. Toensberg. Ex A. Vezda: Lichenes Rariores Exsiccati Nr. 442.