Bacidina friesiana (Hepp) S. Ekman

Nordic J. Bot.: e03846, 30. 2023. Basionym: Biatora friesiana Hepp - Flecht. Eur.: nr. 288, 1857.
Synonyms: Bacidia friesiana (Hepp) Körb.; Lecidea norrlinii Lamy
Description: Thallus crustose, endosubstratic or thinly episubstratic, discontinuous or of discrete to contiguous, minutely subgranular, 0.2-0.8 mm wide areoles, whitish, pale grey or pale brown-grey, sometimes with a thin, endosubstratic, pale grey hypothallus. Apothecia biatorine, often aggregated, 0.2-0.8 mm across, piebald when mature but basically pale straw-coloured (not pink) mixed with grey to brown to almost black hues, with an initially flat, finally often convex, epruinose disc, and a concolorous to darker (especially when wet), often finally excluded proper margin. Proper exciple 50-60 μm wide laterally, yellowish with a grey, brown or blackish pigment concentrated in the outer upper part, with a single cell layer of globose, 3-6 µm wide cells, paler or colourless within, the pigmented parts K+ purplish, N+ orange-red; epithecium scarcely differentiated from the hymenium, pale brown, the pigmented parts K- and N+ purple; hymenium 40-65 μm high, colourless to pale brown in lower part, merging with the epithecium in upper part; paraphyses 1-1.5 μm thick at mid-level, the apical cells usually clavate, but sometimes weakly or not swollen, up to 5 μm wide; hypothecium colourless to very pale straw-coloured. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass) never penetrating through the entire d-layer, the wall K/I-, but the thin outer gel K/I+ blue, Bacidia-type. Ascospores (3-)7-9-septate, hyaline, needle-like, straight to sigmoid, 30-55(-70) x 2-3.5 μm, tapering towards one end. Pycnidia semi-immersed, 80-360 µm across, unilocular, strongly flattened and unpigmented except for a brown ring around the ostiole, which is finally widely gaping. Conidia thread-like, more or less curved, aseptate, 9-14 x c. 1 µm, formed terminally. Photobiont chlorococcoid, the cells 5-12 μm in diam. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances; apothecia with the Laurocerasi-brown (major) and Bagliettoana-green (minor) pigments.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

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

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Rarity

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P.L. Nimis CC BY-SA 4.0
TSB 23878


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


P.L. Nimis CC BY-SA 04
TSB 3093


Source: Lee BG, Hur J-S (2022) A new species and four new records of Bacidia (Lecanorales, Ramalinaceae) from South Korea, with a key to Korean species. MycoKeys 93: 107-130. - CC BY-4.0
B. friesiana (KBA-L-0001914 for D–F) D habitus and apothecia. Thallus pale grey with slightly brownish pigment and pale pink apothecia E, F apothecial section with greenish epihymenium