Physciella poeltii (Frey) D. Liu & Hur

Index Fungorum, 464: 1, 2020. Basionym: Physcia poeltii Frey - Ber. Schweiz. bot. Ges., 73: 490, 1963.
Synonyms: Phaeophyscia poeltii (Frey) Nimis; Physciella poeltii (Frey) D. Liu & J.S. Hur
Description: Thallus foliose, heteromerous, dorsiventral, narrow-lobed, closely adpressed, forming up to 3(-4) cm wide rosettes. Lobes 0.3-1.5(-2.5) mm wide, contiguous to separate, especially in the younger parts, ash-grey to whitish grey, matt, smooth to finely rugose. Lower surface cream-coloured at margin, pale brown in central parts, with mostly simple rhizines. Upper cortex paraplectenchymatous, with a distinct epinecral layer; medulla white; lower cortex prosoplectenchymatous, not well delimited from the medulla. Apothecia common, lecanorine, often crowded in central parts of thalli, sessile, to 3 mm across, with a black, epruinose disc and an entire to weakly crenulate thalline margin, sometimes with a crown of whitish rhizines in lower part. Epithecium brown; hymenium and hypothecium colourless; paraphyses slender, simple or forked in upper part, the apical cells clavate, with a thin, dark brown cap. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, (16-)18-22(-28) x (6-)8-10(-13) μm, the wall thickened at apex and at septum, intermediate between the Physcia- and Pachysporaria-types. Pycnidia black, immersed. Conidia ellipsoid, 3-3.5 x c. 1 μm. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Foliose, narrow lobed
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

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P.L. Nimis CC BY-SA 04
TSB 35720


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35720)
2003/01/22


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (8831)
2001/12/05


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35720)
2003/01/22


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Phaeophyscia_poeltii.htm
France, session AFL 2014 - Parc du Mercantour - Alpes-de-Haute-Provence


Detail from: https://gzu.jacq.org/GZU000286328
GZU000286328 - Collector Frey,E. 25028 Date 1962-05-03 Location Switzerland / Ticino Label Ticino, Tesserete, Juglans am Weg Vaglio-Lugaggia ; Alt. 555 m Habitat Juglans mit Ph. orbicularis labrata, leptalea & agglutinata. Annotations GZU Inv.-Nr. 55-97 Lichenes Helvetici 4277 - Flechten der Schweiz, Lichens de la Suisse, Licheni della Svizzera