Gyalolechia flavorubescens (Huds.) Søchting, Frödén & Arup var. quercina (Flagey) Nimis

The Lichens of Italy. A second annotated Catalogue: 19, 2016. Basionym: Caloplaca quercina Flagey - Rev. Mycol., 13: 114, 1891.
Synonyms: Caloplaca flavorubescens var. quercina (Flagey) Giralt, Nimis & Poelt
Description: Thallus crustose, more or less continuous, sometimes coarsely papillate, yellow-green to yellow-orange in sun-forms, rarely almost grey in shade-forms. Apothecia common, lecanorine, constricted at base, 0.5-3 mm across, with an orange, usually flat disc, an orange prominent, raised proper margin, and a well developed, yellow, often flexuose or crenulate thalline margin. Epithecium brownish orange, K+ red, C+ purple (in section); hymenium colourless, 50-110 μm high; paraphyses c.1.5 µm thick at base, slightly moniliform, with enlarged, up to 4 µm wide apical cells; hypothecium colourless, sometimes inspersed with oil droplets. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid 12-19 x 6-11 μm, the equatorial thickening (“septum”) 3-8 μm, to half of spore length. Pycnidia rather common, darker orange than thallus, immersed to slightly projecting. Conidia hyaline, bacilliform to slightly pyriform, c. 2 x 0.7 μm. Photobiont chlorococcoid. Spot tests: thallus K+ red, C-, KC-, P-; apothecia K+ red, C+ purple (the latter reaction not always evident). Chemistry: fragilin dominant, with smaller amounts of emodin and parietin; apothecial disc with predominant parietin, and variable amounts of chlorinated anthraquinones.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

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

pH of the substrata:

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Altitudinal distribution:

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Rarity

absent
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common
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Pier Luigi Nimis - CC BY-SA 4.0
TSB 30803


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30883)
2003/03/10


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30883)
2003/03/10
pycnidia