Arthonia oligospora Vězda

Lich. Sel. Exs. (Průhonice), 47: 2 (no. 1154), 1973.
Distribution: C - Abr (TSB 36954).
Description: Thallus inapparent, not lichenized, forming discoloured patches on the thalli and apothecia of Polyozosia-species. Apothecia arthonioid, black, epruinose, slightly convex, irregularly rounded, 0.2-0.4 mm wide. Proper exciple very poorly developed; epithecium olive-green to dark brown, K-, I+ rust-red, K/I+ blue; hymenium olive-green, c. 45 μm high, I+ wine-red, K/I+ blue; paraphysoids branched and anastomosing, c. 1.5 μm thick, the apical cells swollen; hypothecium brown-black. Asci 4(-6)-spored, broadly clavate or obovate, semi-fissitunicate, with a large apical dome and a distinct ocular chamber, the apex with a K/I+ blue, elongated ring structure and paler bluish tholus flanks, Arthonia-type. Ascospores 1-septate, hyaline, ellipsoid, 10-12 x 5-6 μm, smooth-walled. Photobiont absent. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a lichenicolous fungus growing on species of Polyozosia. Never reported from Italy, but to be looked for there.
Growth form: Lichenicolous fungus
Substrata: rocks
Reproductive strategy: mainly sexual
paras Myriolecis-specis

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: very rare
Oromediterranean belt: very rare
Montane belt: very rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples; Owner: CC BY-SA 3.0; Owner: CC BY-SA 3.0