Arthonia ruana A. Massal.

Ric. Auton. Lich. Crost.: 49, 1852.
Synonyms: Arthonia anastomosans (Ach.) Nyl.; Arthonia beltraminiana (A. Massal.) H. Olivier; Arthonia rosacea Anzi; Arthoniopsis ruana (A. Massal.) Trevis.; Arthothelium beltraminianum A. Massal.; Arthothelium dispersum auct. non (DC.) Mudd; Arthothelium rosaceum (Anzi) Zahlbr.; Arthothelium ruanideum (Nyl.) Arnold; Arthothelium ruanum (A. Massal.) Körb.
Distribution: N - Frl (Grube & Giralt 1996), Ven (Sundin & Tehler 1998, Lazzarin 2000b), TAA (Nascimbene & al. 2007b), Lomb (Valcuvia & Truzzi 2007, 2007b), Piem. C - Tosc. S - Camp (Ravera & al. 2018b), Pugl (Durini & Medagli 2004), Bas (Potenza 2006, Potenza & al. 2010, Potenza & Fascetti 2012), Cal (Puntillo 1996).
Description: Thallus crustose, endosubstratic, dull white, greyish brown to yellowish grey, smooth, thin, effuse, sometimes delimited by a dark prothallus, the thalline hyphae I-. Apothecia arthonioid, rounded to irregularly stellate in outline, 0.5-2 mm across, slightly immersed and level with thallus, with a black, epruinose, rough, often cracked disc, without a distinct margin, often disintegrating in the central part and peripherically regenerating as small segregated hymenial patches. Epithecium brown-black, 13-21 µm high, K+ greenish; hymenium colourless to pale brown, c. 35-50 µm high, I+ reddish, K/I+ blue; paraphysoids coherent, simple or sparingly branched in upper part, 1-1.5 µm thick; hypothecium dark reddish brown, 20-50 µm high. Asci 8-spored, broadly clavate, semi-fissitunicate, with a large apical dome, a distinct ocular chamber, and a K/I+ blue ring, Arthonia-type. Ascospores muriform, with 4-9 transverse septa and 1-3 longitudinal septa, hyaline to pale brown and faintly warted when old, obovoid to broadly ellipsoid, (15-)17-24(-26) x 7-9(-11) µm. Pycnidia hemispherical, brown to black, the wall red-brown, K+ greenish. Conidia bacilliform, 4-6.5 x 1-1.5 µm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a temperate-suboceanic lichen found on smooth bark of deciduous trees and shrubs (e.g. Alnus, Fagus, Fraxinus, Corylus, etc.) in humid deciduous forests, often on the basal parts of trunks; widespread, probably overlooked and more common in Italy than the few records would suggest.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

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


pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Poleotolerance:

(info)

0

1

2

3

Altitudinal distribution:

(info)

1

2

3

4

5





P.L. Nimis CC BY-SA 4.0
TSB 41420



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9241)
2001/11/21


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad cort. Coniferarum in Euganeorum colle Rua.
Trevisan Lichenotheca Veneta 131


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad cort. Coniferarum in Euganeorum colle Rua.
Trevisan Lichenotheca Veneta 131


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad cort. Coniferarum in Euganeorum colle Rua.
Trevisan Lichenotheca Veneta 131



P.L. Nimis CC BY-SA 4.0
TSB 41419


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)



P.L. Nimis CC BY-SA 4.0
TSB 41420