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Arthonia quintaria Nyl.  
Family: Arthoniaceae
Arthonia quintaria image
Gary Perlmutter
  • Lichens of North Carolina
  • Resources
North Carolina Biodiversity Project
MB#376780

Type. UNITED STATES. New Jersey: Eckfeldt, J.W. s.n. (H-NYL 4990, holotype)

Description. Non-lichenized, presumably saprophytic “allied” fungus.
Thallus
crustose, continuous, thin to flaky, whitish to purplish; photobiont absent; vegetative diaspores absent.
Ascomata arthonioid, punctiform to irregular to lirellate, immersed, minute to small: 0.1-0.3 mm diam., frequent. Disc flat to slightly convex, black; exciple absent; epithecium dark; hymenium hyaline, amyloid (I+ blue, K/I+ blue); paraphyses absent. Asci globose with tapering foot, 8-spored. Ascospores colorless, ovoid, 5-septate with end cell larger (macrocephalic), 18-25 x 6-10 μm.

Chemistry. Spot tests all negative, secondary metabolites unknown.

Substrate and Habitat. On smooth bark of hardwood twigs and branches, in hardwood and mixed forests, also seen in human-altered habitats.

Distribution. Eastern North America; in North Carolina common throughout.

Notes. Arthonia quintaria is a member of a large, typically lichenized genus that includes species that lack a photobiont or are weakly lichenized. It is not clear whether the nonlichenized state is ancestral or species have secondarily lost their photobiont and evolved a saprophytic lifestyle.  Arthonia quintaria is a pioneer species, often found on twigs. It is postulated that the species produces spores seasonally, as several collections lack spores or mature asci.

Literature

Nylander, W. (1885) Arthoniae novae Americae borealis. Flora 68(16): 311-313. (original description)

Fink, B. (1935) The Lichen Flora of the United States. University of Michigan Press, Ann Arbor.

Thiyagaraja, V., R. Lücking, D. Ertz, D.N. Wanasinghe, S.C. Karunarathna, E. Camporesi & K.D. Hyde. (2020) Evolution of non-lichenized, saprophytic species of Arthonia (Ascomycota, Arthoniales) and resurrection of Naevia, with notes on Mycoporum. Fungal Diversity 102: 205-224.

Arthonia quintaria
Open Interactive Map
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Gary Perlmutter
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Gary Perlmutter
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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