Pyrenodesmia helygeoides (Vain.) Arnold
Verh. zool.-bot. Ges. Wien, 47: 215, 1897.. Basionym: Lecanora helygeoides Vain. - Medd. Soc. Fauna Flora Fenn., 6: 148, 1881.
Synonyms: Callopisma diphyodes (Nyl.) Bagl. & Carestia sensu Baglietto & Carestia; Caloplaca diphyodes auct. ital. non (Nyl.) Jatta; Caloplaca diphyodes var. helygeoides (Vain.) H. Olivier; Caloplaca diphyodes var. helygeoides (Vain.) H. Olivier; Caloplaca helygeoides (Vain.) Dalla Torre & Sarnth.
Description: Thallus crustose, episubstratic, rimose-areolate, dirty white-grey, pale brown or brown-black, to 0.3 mm thick, without a distinct prothallus. Apothecia lecideine, round or irregular in outline, 0.2-1.2 mm across, slightly immersed to sessile, with a black, epruinose or initially faintly pruinose, flat to slightly convex disc, a thin, often soon excluded, whitish thalline margin and a proper margin which, when wet, appears as a darker ring around the disc. Thalline exciple corticate at least in upper part, brownish to grey in outer part, colourless within; epithecium pale brown, brown or almost colourless, K- or usually K+ weakly violet, C+ purple, N+ purple, without an epipsamma; hymenium colourless 73-110 μm high, usually inspersed with oil droplets, without crystals; paraphyses sparingly branched, 1-5.2.5(-3) μm thick at mid-level, the apical cells to 5.5 μm wide; hypothecium colourless, 70-125 μm high. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid, 12-18 x 6.5-11.5 μm, the equatorial thickening (“septum”) 3-7 μm. Pycnidia black, immersed. Conidia simple, hyaline, 3-4 x 1.5-2 μm. Photobiont chlorococcoid. Spot tests: cortex K+ weakly violet, C-, KC-, P-, UV-. Chemistry: cortex and sometimes epithecium with the Sedifolia-grey pigment.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study
Commonnes-rarity: (info)
Alpine belt: very rare
Subalpine belt: rare
Montane belt: extremely rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
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
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Occurrence data
Predictive map
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13369)
2001/11/13
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study
Commonnes-rarity: (info)
Alpine belt: very rare
Subalpine belt: rare
Montane belt: extremely rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
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
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13369)
2001/11/13
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_5/Pyrenodesmia_heligeoides.htm
France, 14/9/2014 - Darois - Côte-d'Or - (21) - Au dessus de Val Suzon, Combe En Neudry, alt.: 470 m
