Arthonia excentrica Th. Fr.

K. Svenska Vetensk.-Akad. Handl., 7, 2: 46, 1867.
Synonyms: Allarthonia excentrica (Th. Fr.) Zahlbr.; Arthonia albinula Nyl.
Distribution: N - Emil (Tretiach & al. 2008, Brackel 2016, Fariselli & al. 2020).
Description: Thallus inapparent, not lichenized, developing on the thalli of leprose lichens. Apothecia arthonioid, immarginate, dark purplish brown when dry, rounded, flat to finally convex, 0.1-0.3 mm across, at first partially immersed in the host thallus. Proper exciple poorly developed; epithecium dark reddish brown; hymenium colourless to pale yellowish brown, 50-60 µm high; paraphysoids branched and anastomosing, the apical cells brown-capped, c. 3 µm wide; hypothecium brownish, K+ olive-brown. Asci 8-spored, broadly clavate, semi-fissitunicate, with a large apical dome, a distinct ocular chamber, and a K/I + blue part near the apex of the ocular chamber, Arthonia-type. Ascospores (1-)3-septate (both 1- and 3-septate spores sometimes occurring together in the same ascus), hyaline, 12-15(-17) x (3-)3-5(-6.5) µm. Photobiont absent. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a non-lichenised lichenicolous fungus growing on Lepraria-species; probably more widespread, but largely overlooked.
Growth form: Lichenicolous fungus
Substrata: rocks, bark, and lignum
Reproductive strategy: mainly sexual
paras Lepraria spp.

Commonnes-rarity: (info)

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

pH of the substrata:

12345

(info)

Solar irradiation:

12345

(info)

Aridity:

12345

(info)

Eutrophication:

12345

(info)

Poleotolerance:

0123

(info)

Altitudinal distribution:

123456

(info)


Predictive model
Index Fungorum GBIF

United States National Herbarium - Smithsonian (US:Lichens) - Collector: R. Santesson & R. Moberg Number: P2821 Date: 1981-02-17 Locality: Peru, Pasco, Pasco, ca. 3 km SE of Cerro de Pasco. -10.7 -76.25 - CC BY-NC 3.0 - Source: Consortium of Lichen Herbaria (2023) http//:lichenportal.org/portal/index.php. Accessed on December 15.