Melanohalea olivacea (L.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch

Mycol. Res., 108: 882, 2004. Basionym: Lichen olivaceus L. - Sp. Pl.: 1143, 1753, nom. cons.
Synonyms: Imbricaria olivacea (L.) DC.; Melanelia olivacea (L.) Essl.; Parmelia olivacea (L.) Ach.
Distribution: N - Ven, Lomb (Alessio & al. 1995, Gheza 2019), VA (Piervittori & Isocrono 1999).
Description: Thallus foliose, heteromerous, dorsiventral, olive-brown to dark brown, dull to slightly glossy in marginal parts, forming up to 15 cm wide rosettes. Lobes to 5 mm wide, slightly raised at margins, wrinkled, bearing obscure to distinctive, punctiform, laminal pseudocyphellae, which are best visible in the marginal parts; lower surface dark brown, paler in marginal parts, with mostly simple rhizines. Upper cortex paraplectenchymatous, with a non-pored epicortex, the cell walls containing isolichenan; medulla white; lower cortex paraplectenchymatous. Apothecia frequent, lecanorine, to 9 mm across, often crowded in central parts of thallus, with a concave to finally convex, brown disc, and an entire to finally strongly crenulate thalline margin with punctiform to somewhat elongated pseudocyphellae. Epithecium brown; hymenium colourless, 50-110 μm high; subymenium rather thick, 20-45 μm high; hypothecium colourless, 10-40 μm high. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, ovoid to ellipsoid, 12-17 x 7-11 μm. Pycnidia frequent, black, laminal. Conidia more or less dumbbell-shaped, c. 8 x 1 μm. Photobiont chlorococcoid. Spot tests: upper cortex K-, C-, KC-, P-; medulla K- or rarely K+ yellow, C-, KC-, P+ orange. Chemistry: fumarprotocetraric acid, protocetraric acid (sometimes only in traces), sometimes atranorin in low amounts.
Note: a circumboreal-montane species, mostly found on Betula in cold, but sunny situations and in upland areas. The epithet "olivacea" was used in the past for several other species of this group; all earlier records from Italy are unreliable, including that of Ahti from the Euganean Hills (see Nimis 1993: 479); the recent ones from Lombardia and Valle d'Aosta need confirmation. The species, however, was recently reported from several localities in Switzerland.
Growth form: Foliose, broad lobed
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: extremely rare
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

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php



G. Incerti; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (27371)
2001/11/26


Andres Saag; Owner: University of Tartu


Triin Aimla; Owner: University of Tartu



Felix Schumm - CC BY-SA 4.0
[20350], Suecia, Härjedalen, Tännäs Paroecia, Ramundberget, 760 m, in ramulis Betulae. Leg. R. Santesson (24373), 27.06.1973. A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1212



Felix Schumm - CC BY-SA 4.0
[20350], Suecia, Härjedalen, Tännäs Paroecia, Ramundberget, 760 m, in ramulis Betulae. Leg. R. Santesson (24373), 27.06.1973. A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1212



P.L. Nimis - CC BY-SA 4.0
TSB 42003



P.L. Nimis - CC BY-SA 4.0
TSB 42003



P.L. Nimis - CC BY-SA 4.0
TSB 42003