Code: Bot_1124/2018_DSC2046

Habitat: stony path through dense low bushes, calcareous, skeletal ground; sunny, very dry place, slightly inclined terrain, southwest aspect; elevation 70 m (230 feet); average precipitations ~ 1.000 mm/year, average temperature 13 -14 deg C, sub-Mediterranean phytogeographical region.

Substratum: hard calcareous rock.

Place: West Krk island, west of village Brzac, at about halfway of a trail to sea shore, Kvarner bay, Adriatic Sea, Croatia EC.

Comment: Closely related Gyalolechia fulgida and Gyalolechia fulgens (Ref.1) are both beautifully colored lichens. Gyalolechia fulgens is more common but still a rare species. First I thought I found Gyalolechia fulgens. However, later I realized that bare rock is not an appropriate substratum for it since it (mostly?) grows on soil, mosses and sand dunes (it is terricolous species). There were several specimens at the place of this observation and all of them grew on bare, hard calcareous rocks (were exception less saxicolous). This better fits to Gyalolechia fulgida (according to most sources). Gyalolechia fulgida also has convex squamulose thallus all the way to its center, while the thallus of Gyalolechia fulgens is usually smoother or areolate in the central region (Ref.7). Gyalolechia fulgens also prefers less arid habitats than Gyalolechia fulgida (Ref.4.). The habitat of this find is very dry, which also supports my determination. Thallus and apothecia K+ crimson fits to both species.

Yet, information about Gyalolechia fulgida I was able to find is very scarce (not mentioned at all in all of my books) and sometimes contradictory. For example: different description of thallus; several authors state also soils as substrate of Gyalolechia fulgida (some even exclusively) and others mention also calcareous rock as a possible substrate for Gyalolechia fulgens. Hence my determination isn’t completely reliable.

Nikon D700 / Nikkor Micro 105mm/f2.8 and Sony ILCE6000 / Carl Zeiss Vario-Tessar E 16-70 mm/f4


Proposed Names

57% (1)
Recognized by sight: Bright yellow, lobate at the margin, thallus with red apothecia on bare calcareous rock. Mediterranean species.
Used references: (1) U.Arup, U. Søchting and P. Frödén, A new taxonomy of the family Teloschistaceae, Nordic Journal of Botany 31: 016–083 (2013).
(2) (accessed May 7. 2018)
(3) (accessed May 8. 2018)
(4) (accessed May 6. 2018)
(5) (accessed May 7. 2018)
(6) P. L. Nimis, The Lichens of Italy: A Second Annotated Catalogue, Edizioni Università di Trieste (2016)
(7) (accessed May 7. 2018)
(8) H. Mayehofer, D. Stešević, A. Brudermann, B.R. FÖtschl & P.O. Biloviz, New or otherwise interesting lichenized and lichenicolous fungi from Montenegro II. – Fritschiana (Graz) (2017) 86: 1–30. Available at: (accessed May 7. 2018)
Based on chemical features: thallus and apothecia K+ crimson

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Created: 2018-05-10 13:38:03 CDT (-0400)
Last modified: 2018-05-10 13:38:10 CDT (-0400)
Viewed: 33 times, last viewed: 2019-08-13 14:56:15 CDT (-0400)
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