Flavoplaca austrocitrina (Vondrák, Ríha, Arup & Søchting) Arup, Søchting & Frödén

Nord. J. Bot., 31: 44, 2013. Basionym: Caloplaca austrocitrina Vondrák - Ríha, Arup & Søchting in Vondrák & al., Lichenologist, 41: 588, 2009.
Synonyms:
Distribution: N - Frl (TSB 546).
Description: Thallus crustose, yellow, areolate or formed of aggregated, corticate squamules which are (in average) 190 μm thick and 0.7 mm wide, flat, smooth, with marginal soralia which in old thalli may cover the whole surface. Soredia (22-)26-46(-61) μm diam, sometimes gathered to consoredia. Apothecia zeorine, 0.3-0.6 mm across, with a flat to convex disc, and a sorediate thalline margin which, in young apothecia, is hidden below the proper margin, becoming more evident in old apothecia. Hymenium 60-80 μm thick, colourless; epithecium orange, K+ red; hymenium colourless; paraphyses tips widened at apex to 3-6 μm. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, polarilocular, hyaline, ellipsoid, in average 11 x 6 μm, the septa c. 4.5 μm thick. Photobiont chlorococcoid. Spot tests: thallus, soredia and apothecia K+ red, C-, KC-, P-. Chemistry: anthraquinones.
Note: a species of the F. citrina group with an areolate to subsquamulose, usually yellow to greenish-orange thallus and marginal soralia, apothecia not rare; mostly on artificial substrates like concrete or mortar in strongly manured places, e.g. in sites visited by dogs; certainly much more common and hidden behind records of F. citrina.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Pioneer species

Commonnes-rarity: (info)

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


pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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Source: http://fungi.myspecies.info/all-fungi/flavoplaca-austrocitrina - CC BY-NC