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Pyrenula macrospora (Degel.) Coppins & P. James

Synonyms:

Family: PYRENULACEAE

Habitat: Oceanic zone

Description

    Thallus crustose, more or less immersed, waxy when moist, brown-greenish under rain showers, cream-yellowish to fawn when dry, minutely dotted with white pseudocyphella, 40-120 µm diam., prothallus black conspicuous notably in case of mosaics. Perithecia abundant, scattered all over the thallus without specific pattern, markedly prominent, hemispherical, ostiole central, distinctly visible, 0.5-1.2 mm diam., yielding black cupules after falling. Ascospores ellipsoid, brown, 3-septate, with a unique curved angles diamond-shaped locule per cell, 27-33 x 10-13 µm. Pycnidia abundant, 100-180 µm diam., black, often aligned along the black prothallus line delimiting contiguous colonies, producing a characteristic 'seam line' aspect (see pictures resembling to patchworks composed of pieces of leather). Photobiont: Trentepohlia. C-, K+ yellow, KC-, Pd+/-pale yellow, UV+ yellow-orange. Rather common near the seashore on smooth bark of trees, often forming large remarkable mosaics by merging of contiguous colonies. Sometimes together with Pyrenula chlorospila of which the perithecia are smaller and ascospores with diamond-shaped locules presenting sharper angles. See  Pyrenula nitida that is K+ red-orange, has no maritime trend and has smaller ascospores.*







Pyrenula macrospora Sur FrĂȘne Lesteven
Alain GERAULT



Pyrenula macrospora Lesteven 1
Alain GERAULT



Pyrenula macrospora DĂ©tail des pycnides Lesteven 2
Alain GERAULT



Pyrenula macrospora Lesteven 3
Bernard BOUFFINIER



Pyrenula macrospora Lesteven 4
Bernard BOUFFINIER



Pyrenula macrospora Lesteven 5
Alain GERAULT



Pyrenula macrospora Crozon 2
Bernard BOUFFINIER



Pyrenula macrospora Crozon 3
Bernard BOUFFINIER



Pyrenula macrospora Crozon 1
Bernard BOUFFINIER



Pyrenula macrospora Asques Lesteven 1
Jacques HAINE



Pyrenula macrospora Spores Lesteven
Jacques HAINE



Pyrenula macrospora Landévennec
Bernard BOUFFINIER



Pyrenula macrospora Crozon 4
Bernard BOUFFINIER



Pyrenula macrospora Crozon 5
Bernard BOUFFINIER



Pyrenula macrospora Crozon 6
Bernard BOUFFINIER



Pyrenula macrospora Crozon 7
Bernard BOUFFINIER



Pyrenula macrospora Crozon 8
Bernard BOUFFINIER



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