Cetraria madreporiformis (Ach.) Müll. Arg.

Flora, Regensburg, 53: 325, 1870. Basionym: Dufourea madreporiformis Ach. - Lichenogr. Univ.: 525, 1810.
Synonyms: Allocetraria madreporiformis (Ach.) Kärnefelt & A. Thell; Dactylina madreporiformis (Ach.) Tuck.; Evernia madreporiformis (Ach.) Fr.
Distribution: N - Frl, TAA (Obermayer 2003, Bilovitz & al. 2014b), Lomb, Piem (LD-1060365), VA (Piervittori & Isocrono 1999). C - Abr (Nimis & Tretiach 1999, Di Nuzzo & al. 2021, Gheza & al. 2021, Vallese & al. 2022, Lich. Ital. Exs. 61: Isocrono & al. 2022).
Description: Thallus fruticose, greenish to yellowish green, sometimes turning brown in sun-forms, sparsely isotomic-dichotomously branching from near the base, forming tufts. Branches soft, slightly foveolate, ascending to erect, rarely prostrate in forms of wind-swept ridges, subterete or slightly irregular, up to 4 cm tall, 1-2 mm thick. Cortex paraplectenchymatous; medulla white, lax, arachnoid throughout. Apothecia extremely rare (not seen in Italian material), zeorine, subterminal, with a pale brown disc. Asci 8-spored, narrowly clavate, Lecanora-type. Ascospores 1-celled, thick-walled, broadly ellipsoid to subglobose, 6-10 x 4-8 µm. Pycnidia dark, immersed to slightly projecting. Conidia filiform, slightly curved, 13-20 x 0.5-1 µm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC+ yellowish, P-; medulla K-, C-, KC-, P-. Chemistry: cortex with usnic acid; medulla with lichesterinic acid.
Note: an arctic-alpine species found in open grasslands and in wind-exposed ridges above treeline, in areas with calciferous substrata; probably widespread throughout the Italian Alps. The record from Abruzzo (central Apennines) is the southernmost one in Europe.
Growth form: Fruticose

Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by thallus fragmentation

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 43799



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9929)
2002/01/02



Curtis Randall Björk – CC BY-SA 4.0
Near the shore of Hope Bay, Nunavut, central Canadian Arctic, Northwest Territories, Canada
20.07.2014



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Mt. Majella, Abruzzo, Italy



P.L. Nimis CC BY-SA 4.0
TSB 41410



P.L. Nimis CC BY-SA 04
TSB 43799



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9929)
2002/01/02



P.L. Nimis CC BY-SA 04
TSB 43799



P.L. Nimis CC BY-SA 04
TSB 36912



P.L. Nimis CC BY-SA 04
TSB 36913



P.L. Nimis CC BY-SA 04
TSB 36913