Coenogonium luteum (Dicks.) Kalb & Lücking

in Lücking & Kalb, Bot. Jahrb., 122: 32, 2000. Basionym: Lichen luteus Dicks. - Fasc. Pl. Cryptog. Brit., 1: 11, 1785.
Synonyms: Biatorina lutea (Dicks.) Körb.; Dimerella lutea (Dicks.) Trevis.; Gyalecta lutea (Dicks.) Hornem.; Microphiale lutea (Dicks.) Zahlbr.
Distribution: N - VG, Ven (Nascimbene 2004, Nascimbene & al. 2005b, 2006c), Lomb (Jatta 1909-1911), Piem (Isocrono & al. 2004). C - Tosc, Laz (Munzi & al. 2013), Sar (Zedda 2002, 2002b). S - Camp (Aprile & al. 2003b), Pugl, Cal (Puntillo 1996), Si (Nimis & al. 1994, Ottonello & Puntillo 2009, Ottonello & al. 2011).
Description: Thallus crustose, thin, spreading, continuous to cracked-areolate, pale yellowish green to dark olive-green, sometimes evanescent. Apothecia lecideine, sessile, round, 0.4-1.5(-2) mm across, usually scattered, clearly constricted at base, with a orange-yellow to yellow-red, shallowly concave then convex, epruinose disc and a paler, flesh-colored, prominent, entire or flexuous, persistent margin. Proper exciple 40-60 µm thick, paraplectenchymatous; hymenium colourless, I+ blue; paraphyses 1.5-2.7 µm thick, the apical cells c. 4.5 µm wide; hypothecium colourless. Asci 8-spored, narrowly cylindrical, without an amyloid ring around the apical pore, Catillaria-type, with uniseriate ascospores. Ascospores 1-septate, hyaline, fusiform to fusiform-ellipsoid, (6-)9-11(-14) x 2-3.5(-4.5) µm. Pycnidia more or less immersed, yellowish. Conidia ellipsoid, 3-4(-5) x 1.3-2(-2.5) µm. Photobiont trentepohlioid. Spot tests: all negative. Chemistry: no lichen substances.
Note: a mild-temperate to humid subtropical lichen found on bark and epiphytic liverworts in semi-natural, old, humid forests at low elevations; mostly Tyrrhenian in Italy. It is included in the Italian red list of epiphytic lichens under the “Least Concern” category (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
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: absent
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: extremely rare
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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Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Andres Saag; Owner: University of Tartu


Domenico Puntillo; Owner: Domenico Puntillo
Italy


Gothamie Weerakoon; Owner: Gothamie Weerakoon


Gothamie Weerakoon; Owner: Gothamie Weerakoon


Gothamie Weerakoon; Owner: Gothamie Weerakoon


Curtis Randall Björk, - CC BY-SA 4.0
Vancouver Island, British Columbia, Canada
2017


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9421)
2001/11/23


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010


Felix Schumm – CC BY-SA 4.0
[8577], Portugal, Madeira, Ribeiro Frio, unmittelbar an der Straße oberhalb des Rastplatzes, Nordhang mit Lorbeerwald, 32°44.072’ N, 16°53.230’ W, 903 m. Leg. Schumm 14.04.2001, det. Aptroot 2010