Porina oxneri R. Sant.

Symb. Bot. Upsal., 12, 1: 221, 1952.
Synonyms: Phylloporina obsoleta Oxner; Pseudosagedia obsoleta (Oxner) Hafellner & Kalb
Distribution: C - Tosc (Puntillo & Ottonello 1997, Puntillo 2000), Umb (Ravera & al. 2011), Laz (Ravera 2006, 2006c). S - Camp (Puntillo & al. 2000, Puntillo 2000, Nimis & Tretiach 2004), Bas (Puntillo & al. 2012), Cal (Puntillo & Vezda 1994, Puntillo 1995, 1996, 2000, Puntillo & Puntillo 2004).
Description: Thallus crustose, thinly episubstratic, forming small, dispersed orbicular, up to 10 mm wide patches or more rarely continuous, smooth, pale grey to dark brownish grey, dull, without a distinct prothallus. Perithecia 0.15-0.25(-0.3) mm across, lenticular to hemispherical, not constricted at base, black to greyish-black, partly covered by hyphal tissue in lower part, the ostiole usually well-evident. Involucrellum 20-30 μm thick, black, K-; exciple prosoplectenchymatous, colourless to almost black, up to 15 μm thick; paraphyses simple or sparingly branched and anastomosing, c. 1 µm thick; hymenial gel I-, K/I-. Asci 8-spored, clavate, thin-walled throughout, functionally unitunicate, dehiscent by rupture of the apex, with no extruded inner layers and an apical ring structure, I-, K/I-. Ascospores 3-septate, hyaline, ellipsoid to fusiform with subobtuse ends, 13-20 x 3-4.5(-5) µm. Pycnidia up to 0.1 mm across, black. Conidia simple, bacilliform. 5-6 x 1-1.5 µm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.
Note: an obligately foliicolous lichen, confined to warm-moist forests, on needles of Abies, leaves of evergreen trees and shrubs (e.g. Buxus), and cladodes of Ruscus; mainly Tyrrhenian in Italy. It is included in the Italian red list of epiphytic lichens as “Vulnerable” (Nascimbene & al. 2013c), although it seems to be quite widespread, albeit not common.
Growth form: Crustose
Substrata: leaves
Photobiont: 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
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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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


Felix Schumm - CC BY-SA 4.0
[VZR390], India. Insulae Andaman, Long Island,Lalajee Bay. Ad folia arborunm. Leg. R. Detinský, 4.1998, det. A. Vezda. EX A. VEZDA: LICHENES RARIORES EXSICCATI NR. 390.



Felix Schumm - CC BY-SA 4.0
[VZR390], India. Insulae Andaman, Long Island,Lalajee Bay. Ad folia arborunm. Leg. R. Detinský, 4.1998, det. A. Vezda. EX A. VEZDA: LICHENES RARIORES EXSICCATI NR. 390.



Felix Schumm - CC BY-SA 4.0
[VZR390], India. Insulae Andaman, Long Island,Lalajee Bay. Ad folia arborunm. Leg. R. Detinský, 4.1998, det. A. Vezda. EX A. VEZDA: LICHENES RARIORES EXSICCATI NR. 390.



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9113)
2001/11/29


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Porina_oxneri.htm
France, session 2014 dans le Parc du Mercantour


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Porina_oxneri.htm
France, session 2014 dans le Parc du Mercantour


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Porina_oxneri.htm
France, 2/6/2015 - Combe Lavaux, Côte-d'Or


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Porina_oxneri.htm
France, 2/6/2015 - Combe Lavaux, Côte-d'Or


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Porina_oxneri.htm
France, 2/6/2015 - Combe Lavaux, Côte-d'Or


Gabriele Gheza
Italy, Liguria, Imperia, Apricale



Felix Schumm - CC BY 4.0
[VZ1946], Gallia. Provence, inter Grasse et Draguignan, Siagne, 75 m. Ad folia Buxi sempervirentis. Leg. J. De Sloover, 12.6.1981, det. E. Sérusiaux et J. De Sloover. EX A. VEZDA LICHENES SELECTI EXSICCATI NR.1946.



Felix Schumm - CC BY 4.0
[VZ1946], Gallia. Provence, inter Grasse et Draguignan, Siagne, 75 m. Ad folia Buxi sempervirentis. Leg. J. De Sloover, 12.6.1981, det. E. Sérusiaux et J. De Sloover. EX A. VEZDA LICHENES SELECTI EXSICCATI NR.1946.