Buellia flavescens (J. Steiner) Senkard.

Lichenologist, 42: 440, 2010. Basionym: Buellia saxorum var. flavescens J. Steiner - Verh. zool.-bot. Ges. Wien, 22: 345, 1907.
Synonyms:
Distribution: N - Lig (Senkardser 2010).
Description: Thallus crustose, episubstratic, rimose or rimose-areolate, white to yellowish white, epruinose, usually delimited by a black prothallus. Medulla white, but partly yellowish-inspersed, amyloid, I+ violet. Apothecia lecideine, black, sessile and constricted at base, 0.2-0.5 mm across, with a flat to convex, epruinose disc, and a thick, raised, persistent proper margin. Epithecium brown, N-; hymenium colourless, not inspersed with oil droplets, 40-70 µm high; hypothecium dark reddish brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, brown, ellipsoid, 12-14 x 7-9 µm, Physconia-type, the wall with a median thickening but without lateral thickenings. Photobiont chlorococcoid. Spot tests: K+ yellow, C+ deep yellow, KC+ yellow, P- or P+ faintly yellow. Chemistry: atranorin and placodiolic acid.
Note: a recently-resurrected saxicolous species growing on siliceous rocks at low elevations. For further details see Senkardesler (2010).
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: extremely rare
Dry mediterranean belt: extremely rare


pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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