Arthonia xanthoparmeliarum Etayo

in Etayo & Sancho, Bibl. Lichenol., 98: 49, 2008.
Synonyms:
Distribution: S - Si (Herb. Brackel).
Description: Thallus inapparent, not lichenized, the hyphae developing inside the thallus and soralia of Xanthoparmelia-species, causing 0.7-1.5 mm wide necrotic patches delimited by a blackish line. Apothecia arthonioid, immersed in the thallus and soralia of the host, more or less round, 1.5-3 mm across, with a black, convex disc, without a distinct proper margin. Proper exciple poorly developed, not evident; epithecium brown, c. 10 µm high; hymenium colourless to pale brown, 35-40 µm high, I+ red, K/I+ blue; paraphysoids branched, the apical cells enlarged, to 3 µm wide; hypothecium pale brown, c. 50 µm high. Asci 8-spored, broadly clavate to subglobose, semi-fissitunicate, with a large, non-amyloid apical dome, and a distinct ocular chamber, Arthonia-type. Ascospores 1-septate, hyaline, claviform, with more or less equal cells or sometimes with the lower cell narrower, 10-14.5 x 4-5 µm, with a hyaline, amyloid perispore. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a rarely collected species, known from both Americas and Luxembourg; there is an unpublished record from Italy (Sicily, herb. Brackel).
Growth form: Lichenicolous fungus
Substrata: rocks
Reproductive strategy: mainly sexual
paras Xanthoparmelia-species

Commonnes-rarity: (info)

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


pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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