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Arthopyrenia cinereopruinosa (Schaer.) A. Massal.

Synonyms:

Family: ARTHOPYRENIACEAE

Habitat: Oceanic zone

Description

     Thallus very thin and barely visible, slender (and may "peel"), smooth, whitish to pale greyish somewhat silvery and pearly. Perithecia black, 0.2-0.3 mm in diameter, possibly covered at first by fragments of thallus and leaving a "wheel" when they fall. Asci subcylindrical to clavate with 8 spores, 55-77 x 12-19 µm according to literature; 50-70 x 12-18 µm according to our measurements. Ascospores hyaline, elliptical to clavate with rounded ends and a perispore 1-2 µm thick, 1-septate, narrowed at the septum and also at the center of each cell giving them a 3-septate appearance at maturity, 15- 22 x 5-8 µm according to literature; 15-20 x 5-7 µm according to our measurements. Pseudoparaphyses thin, divided. Pycnidia sometimes abundant, black, 50-100 µm in diameter. No significant color reactions. Photobiont: absent (species considered non-lichenized, but can be found frequently in, or on, the thallus of Trentepohlia). Fairly rare species growing on the smooth bark of deciduous trees (here on Populus alba).

N.B. Beware of Mycoporum antecellens, quite similar, but with much larger spores and Arthopyrenia analepta whose spores are not shrunk to cells.

N.B. Watch out for Arthopyrenia punctiformis = Naeotrocymbe punctiformis practically without thallus, without pycnidia and with non-"strangled" spores and also with  Naevia (Arthonia)  punctiformis also practically without thallus, without pycnidia and with spores up to 5-septate.







Arthopyrenia cinereopruinosa Crozon S4
Bernard BOUFFINIER



Arthopyrenia cinereopruinosa Spores Rouge Congo Crozon S15
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Arthopyrenia cinereopruinosa Spores Bleu Coton Crozon S16
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Arthopyrenia cinereopruinosa Coupe ascome Lugol Crozon S10
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Arthopyrenia cinereopruinosa Coupe ascome KOH Crozon S8
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Arthopyrenia cinereopruinosa Coupe ascome écrasée KOH Crozon S9
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Arthopyrenia cinereopruinosa Asques Lugol Crozon S13
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Arthopyrenia cinereopruinosa Asques et spores KOH Crozon S11
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Arthopyrenia cinereopruinosa Asques et pseudoparaphyses Rouge Congo Crozon S12
Jacques HAINE



Arthopyrenia cinereopruinosa Asques Bleu Coton Crozon S14
Jacques HAINE



Arthopyrenia cinereopruinosa Crozon S5
Bernard BOUFFINIER



Arthopyrenia cinereopruinosa Crozon S6
Bernard BOUFFINIER



Arthopyrenia cinereopruinosa Crozon S1
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Arthopyrenia cinereopruinosa Crozon S2
Bernard BOUFFINIER



Arthopyrenia cinereopruinosa Crozon S3
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Arthopyrenia cinereopruinosa Habitat Crozon S19
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Arthopyrenia cinereopruinosa Crozon S19
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Arthopyrenia cinereopruinosa Crozon S20
Bernard BOUFFINIER



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