Arthonia radiata (Pers.) Ach.
K. Vetensk.-Akad. Nya Handl., 29: 131, 1808. Basionym: Opegrapha radiata Pers. - Ann. Bot. (Usteri), 1: 29, 1794.
Synonyms: Arthonia astroidea Ach.; Arthonia astroidea f. minor Mereschk.; Arthonia astroidea f. robusta Mereschk.; Arthonia astroidea var. cinerascens (Ach.) Trevis.; Arthonia astroidea var. parallela (Harm.) B. de Lesd.; Arthonia astroidea var. subparallela Müll. Arg.; Arthonia astroidea var. swartziana (Ach.) Sacc.; Arthonia astroidea var. tynnocarpa Ach.; Arthonia betulicola sensu Anzi non A. Massal.; Arthonia montellica A. Massal.; Arthonia opegraphina Leight.; Arthonia sorbina Körb.; Arthonia swartziana Ach.; Arthonia vulgaris Schaer.; Arthonia vulgaris var. astroites (Ach.) A. Massal.; Coniangium vulgare Fr.; Lichen astroites Ach.; Opegrapha astroidea var. radiata (Pers.) Ach.; Opegrapha atra var. macularis auct. hisp.
Description: Thallus crustose, lichenized, mostly endosubstratic or rarely thinly episubstratic, smooth, white to pale grey, sometimes with a brownish or olive tinge, rather thin, forming 1-3 cm wide, sometimes confluent and mosaic-forming patches delimited or not by a thin, brown prothalline line. Apothecia arthonioid, emarginate, more or less immersed in the thallus, flat or slightly erumpent, very variable in shape, round or stellate-lobate (1-2 mm across) to sublinear and sparingly branched (to 1.4 x 0.1-0.2 mm), 70-100 µm tall. Proper exciple poorly developed, thin, not extending below the hymenium; epithecium brown or olive-brown, K+ pale green; hymenium colourless, 30-55 µm high, hemiamyloid, I+ blue turning reddish, K/I + blue; paraphysoids 1-2 µm thick at mid-level, the apical cells to 3 µm wide, often with dark caps; hypothecium colourless to pale olive brown, 10-30 µm high, K+ pale green. Asci 8-spored, broadly clavate, semi-fissitunicate, with a large apical dome and a distinct ocular chamber, Arthonia-type. Ascospores 3(-4)-septate, hyaline, oblong-ovoid to oblong, (12-)15-20 x 4-6 µm, the apical cell not enlarged and sometimes narrowed. Pycnidia immersed, black, the wall brown, K+ pale green. Conidia bacilliform, 4-5 x c. 1 µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: very rare
Montane belt: rather common
Dry submediterranean belt: rather common
Humid submediterranean belt: common
Padanian area: very rare
pH of the substrata:
1 2 3 4 5
Solar irradiation:
1 2 3 4 5
Aridity:
1 2 3 4 5
Eutrophication:
1 2 3 4 5
Poleotolerance:
0 1 2 3
Altitudinal distribution:
1 2 3 4 5 6
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map
Current prediction (1981-2010)
Future prediction (2071-2100) SSP 1-2.6
Future prediction (2071-2100) SSP 5-8.5Predictive maps according to Francesconi et al. 2025
Felix Schumm – CC BY-SA 4.0
Image from: F. Schumm (2008) - Flechten Madeiras, der Kanaren und Azoren. Beck, OHG - ISBN: 978-3-00-023700-3

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34832)
2002/02/13

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (7163)
2001/11/21

G. Incerti; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22185)
2001/11/26

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (36978)
2008.02.25

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (36978)
2008.02.25

Felix Schumm – CC BY-SA 4.0
16485], Germany, Baden-Württemberg, Kreis Göppingen, auf Carbinus südlich des Krettenhofes, 400 m.

Felix Schumm – CC BY-SA 4.0
16485], Germany, Baden-Württemberg, Kreis Göppingen, auf Carbinus südlich des Krettenhofes, 400 m.

Felix Schumm – CC BY-SA 4.0
16485], Germany, Baden-Württemberg, Kreis Göppingen, auf Carbinus südlich des Krettenhofes, 400 m.

Felix Schumm – CC BY-SA 4.0
[16491], Germany, Baden-Württemberg, Kreis Göppingen, südlich Gammelshausen beim Kornberg, 690 m, an Carpinus.

Felix Schumm – CC BY-SA 4.0
[11225], Portugal, Azoren, Sao Miguel, an Straßenbäumen zwischen Mosteiros und Bretanha, 37°52.912' N, 25°48.512' W, 260 m. Leg. F. Schumm 06.06.2003, det. F. Schumm 11.2003

Felix Schumm – CC BY-SA 4.0
[11225], Portugal, Azoren, Sao Miguel, an Straßenbäumen zwischen Mosteiros und Bretanha, 37°52.912' N, 25°48.512' W, 260 m. Leg. F. Schumm 06.06.2003, det. F. Schumm 11.2003

Felix Schumm – CC BY-SA 4.0
[11225], Portugal, Azoren, Sao Miguel, an Straßenbäumen zwischen Mosteiros und Bretanha, 37°52.912' N, 25°48.512' W, 260 m. Leg. F. Schumm 06.06.2003, det. F. Schumm 11.2003

Felix Schumm – CC BY-SA 4.0
[12025], GERMANY: Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,Rand des Kuhbergs (Kaltes Feld) nordwestlich von Lauterstein- Nenningen, auf Buchen im Laubwald; 48°43.516' N, 9°51.129' E, 740 m, TK 7225. Leg. F. Schumm 16.04.2005, det. F. Schumm 16.04.2005.

Felix Schumm – CC BY-SA 4.0
[12025], GERMANY: Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,Rand des Kuhbergs (Kaltes Feld) nordwestlich von Lauterstein- Nenningen, auf Buchen im Laubwald; 48°43.516' N, 9°51.129' E, 740 m, TK 7225. Leg. F. Schumm 16.04.2005, det. F. Schumm 16.04.2005.

Felix Schumm – CC BY-SA 4.0
[12025], GERMANY: Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,Rand des Kuhbergs (Kaltes Feld) nordwestlich von Lauterstein- Nenningen, auf Buchen im Laubwald; 48°43.516' N, 9°51.129' E, 740 m, TK 7225. Leg. F. Schumm 16.04.2005, det. F. Schumm 16.04.2005.

Felix Schumm – CC BY-SA 4.0
[13217], GERMANY, Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,zwischen Türkheim und Oppingen beim Wanderparkplatz Hauen,48°34.237' N, 9°48.270' E, 687 m, auf Carpinus. Leg. F. Schumm 16.05.2007, det. F. Schumm 17.05.20

Felix Schumm – CC BY-SA 4.0
[13217], GERMANY, Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,zwischen Türkheim und Oppingen beim Wanderparkplatz Hauen,48°34.237' N, 9°48.270' E, 687 m, auf Carpinus. Leg. F. Schumm 16.05.2007, det. F. Schumm 17.05.20

Felix Schumm – CC BY-SA 4.0
[13217], GERMANY, Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,zwischen Türkheim und Oppingen beim Wanderparkplatz Hauen,48°34.237' N, 9°48.270' E, 687 m, auf Carpinus. Leg. F. Schumm 16.05.2007, det. F. Schumm 17.05.20

Felix Schumm – CC BY-SA 4.0
[13217], GERMANY, Baden-Württemberg, Schwäbische Alb, Kreis Göppingen,zwischen Türkheim und Oppingen beim Wanderparkplatz Hauen,48°34.237' N, 9°48.270' E, 687 m, auf Carpinus. Leg. F. Schumm 16.05.2007, det. F. Schumm 17.05.20

Felix Schumm – CC BY-SA 4.0
[17981], Germany, Baden-Württemberg, Kreis Göppingen, zwischen Nassach und Oberberken, Waldweg zwischen Stärrerberg und Gaibhalden, 48.75491° N, 9.54289° E, 377 m, an Esche. Leg. Schumm 03.04.2012, det. Schumm 2012.

Felix Schumm – CC BY-SA 4.0
[17981], Germany, Baden-Württemberg, Kreis Göppingen, zwischen Nassach und Oberberken, Waldweg zwischen Stärrerberg und Gaibhalden, 48.75491° N, 9.54289° E, 377 m, an Esche. Leg. Schumm 03.04.2012, det. Schumm 2012.

Felix Schumm – CC BY-SA 4.0
[17981], Germany, Baden-Württemberg, Kreis Göppingen, zwischen Nassach und Oberberken, Waldweg zwischen Stärrerberg und Gaibhalden, 48.75491° N, 9.54289° E, 377 m, an Esche. Leg. Schumm 03.04.2012, det. Schumm 2012.

Felix Schumm – CC BY-SA 4.0
[17981], Germany, Baden-Württemberg, Kreis Göppingen, zwischen Nassach und Oberberken, Waldweg zwischen Stärrerberg und Gaibhalden, 48.75491° N, 9.54289° E, 377 m, an Esche. Leg. Schumm 03.04.2012, det. Schumm 2012.

Felix Schumm – CC BY-SA 4.0
[19645], Germany, Baden-Württemberg, Kreis Göppingem, Bartenbach- Krettenhof, an Carpinus, 48.73989° N, 9.67291° E, 400 m. Leg. et det. F. Schumm 24.04.2017

Felix Schumm – CC BY-SA 4.0
[19645], Germany, Baden-Württemberg, Kreis Göppingem, Bartenbach- Krettenhof, an Carpinus, 48.73989° N, 9.67291° E, 400 m. Leg. et det. F. Schumm 24.04.2017

Felix Schumm – CC BY-SA 4.0
[19645], Germany, Baden-Württemberg, Kreis Göppingem, Bartenbach- Krettenhof, an Carpinus, 48.73989° N, 9.67291° E, 400 m. Leg. et det. F. Schumm 24.04.2017

Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Trevisan Lichenotheca Veneta 135 sub Arthonia astroidea Ach. α. vulgaris

Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Trevisan Lichenotheca Veneta 135 sub Arthonia astroidea Ach. α. vulgaris

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Arthonia_radiata.htm
France, Massif Central
24/11/2015

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_A/Arthonia_radiata.htm
France, Massif Central
24/11/2015

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=579&lang=en
France, Ardennes

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=579&lang=en
France, Ardennes

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=579&lang=en
France, Ardennes

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=579&lang=en
France, Ardennes

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=579&lang=en
France, Ardennes

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Central Europe; Germany: Hesse.

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Central Europe; Germany: Hesse.

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Corticolous; on young branches of Fagus sylvatica.Central Europe; Germany; Baden-Württ.: Black forest(Coll. M. Henze).

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Corticolous; on young branches of Fagus sylvatica.Central Europe; Germany; Baden-Württ.: Black forest(Coll. M. Henze).

Felix Schumm - CC BY 4.0
[VZ1103], Romania. Distr. Mehedinti. Baile Herculane, in faucibus as
latera occidentalia montis Domogled, 400 m. Ad corticem Juglandis
regiae. Leg. A. Vezda, 3.6.1972. EX A. VEZDA: LICHENES SELECTI
EXSICCATI NR. 1103.

Felix Schumm - CC BY 4.0
[VZ1103], Romania. Distr. Mehedinti. Baile Herculane, in faucibus as
latera occidentalia montis Domogled, 400 m. Ad corticem Juglandis
regiae. Leg. A. Vezda, 3.6.1972. EX A. VEZDA: LICHENES SELECTI
EXSICCATI NR. 1103.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: very rare
Montane belt: rather common
Dry submediterranean belt: rather common
Humid submediterranean belt: common
Padanian area: very rare
pH of the substrata:
| 1 | 2 | 3 | 4 | 5 |
Solar irradiation:
| 1 | 2 | 3 | 4 | 5 |
Aridity:
| 1 | 2 | 3 | 4 | 5 |
Eutrophication:
| 1 | 2 | 3 | 4 | 5 |
Poleotolerance:
| 0 | 1 | 2 | 3 |
Altitudinal distribution:
| 1 | 2 | 3 | 4 | 5 | 6 |
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map
Current prediction (1981-2010)
Future prediction (2071-2100) SSP 1-2.6
Future prediction (2071-2100) SSP 5-8.5Predictive maps according to Francesconi et al. 2025

