Arthonia intexta Almq.

K. Svenska Vetensk.-Akad. Handl., 17: 60, 1880.
Synonyms: Arthonia intexta var. pauperrima Almq.; Arthonia parasemoides Nyl.; Bacidia wettersteinensis Poelt; Conida intexta (Almq.) Deichm.
Distribution: N - Frl (Hertel 1969), Ven (Brackel 2016), TAA (Brackel 2016), Lomb (Hertel 1969, Brackel 2016). C - Tosc (Benesperi & al. 2007, Brackel 2016), Laz (TSB 8642), Abr (Nimis & Tretiach 1999, Brackel 2016), Sar (Brackel 2016). S - Si (Brackel 2008c, 2016).
Description: Thallus inapparent, not lichenized, the hyphae developing inside the hymenia of Lecidella-species, especially L. carpathica. Apothecia not evident (distinct ascomatal structures missing), with loosely aggregated asci and paraphysoids embedded in the hymenium of the host, whose apothecia are often slightly discoloured. paraphysoids 1.5-3 µm thick at mid-level, exceeding the asci in length, the apical cells olivaceous brown, up to 5.5 µm wide; gelatinous matrix formed by asci and paraphysoids I+ red, K/I+ blue. Asci 8-spored, broadly clavate to subglobose, semi-fissitunicate, with a large, non-amyloid apical dome, a distinct ocular chamber, and a K/I+ blue ring-structure in tholus, Arthonia-type. Ascospores (1-)2(-3)-septate, hyaline, ellipsoid to cylindrical-obovoid, (11-)12-17(-20) x (3-)3.5-5(-6) µm, with a thin epispore. Pycnidia immersed in the hymenium of the host, subglobose, olive brown around the ostiole. Conidia bacilliform, 5-6 x c. 1 µm. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a widespread lichenicolous fungus growing inside the apothecia of saxicolous Lecidella-species, especially L. carpathica; certainly much overlooked and ranging throughout the country,
Growth form: Lichenicolous fungus
Substrata: rocks
Reproductive strategy: mainly sexual
paras Lecidella spp.

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Jason Hollinger - Source:; Owner: Public domain

Martin Grube
Austria, Carinthia, Hohe Tauern, Goldberg-Gruppe, 1650-1750 m
GZU 17-94 - Asci in the hymenium of Lecidella carpathica

Wolfgang von Brackel
Italy, Sicily, Catania, Mt. Etna
Asci in the hymenium of Lecidella carpathica