Hymenelia lacustris (With.) M. Choisy

Bull. mens. Soc. linn. Soc. Bot. Lyon, 18: 145, 1949. Basionym: Lichen lacustris With. - Bot. Arrang. Brit. Plants, ed. 3, 4: 21, 1796.
Synonyms: Aspicilia lacustris (With.) Th. Fr.; Ionaspis hyalocarpa Eitner; Ionaspis lacustris (With.) Lutzoni; Lecanora fulvomellea A.L. Sm.; Lecanora lacustris (With.) Nyl.
Distribution: N - TAA (Nascimbene & al. 2007b, 2022), Lomb, Piem (Gheza & Nascimbene 2024), VA (Piervittori & Isocrono 1999, Isocrono & al. 2008, Favero-Longo & Piervittori 2009).
Description: Thallus crustose, episubstratic, to 0.4 mm thick, continuous to faintly rimose around the apothecia, whitish, brown-orange, ochre-coloured or rusty red, sometimes delimited by a red-brown prothallus, often forming mosaics. Apothecia often crowded, immersed, rounded to slightly angular, 0.2-0.6 mm across, with a concave to flat, orange or pink-orange disc and a poorly evident, paler, slightly raised, often soon excluded margin. Proper exciple brownish in outer and upper parts, colourless within; epithecium pale orange to dark red-brown, with brown granules not dissolving in K, N-, K-; hymenium colourless, 85-120 µm high; paraphyses mostly simple, usually not submoniliform in upper part, not markedly thickened at tips; hypothecium colourless. Asci 8-spored, cylindrical-clavate, the outer coat I+ blue, but the inner walls and apical dome K/I-. Ascospores 1-celled, hyaline, broadly ellipsoid, 13-24 x 6-11 µm, halonate. Pycnidia red-brown. Conidia shortly bacilliform, to 7 µm long. Photobiont chlorococcoid (Asterochloris), the cells <15 µm wide. Spot tests: thallus K- C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a cool-temperate to arctic-alpine, circumpolar species found on siliceous rocks, submerged in mountain creeks.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples


Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260



P.L. Nimis CC BY-SA 4.0
TSB 33260


Mark Rahill - CC BY-SA 4.0
USA



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33260)
2001/12/08



Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley Date: 2012-04-08On periodically inundated basalt boulder on shore of swift, large river



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260


Leif Stridvall - Courtesy Anita Stridvall Source: http://www.stridvall.se/lichens/gallery/Ionaspis/NIKA4087



Pier Luigi Nimis - CC BY-SA 4.0
TSB 33260


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Brennilis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Brennilis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Brennilis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Brennilis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Brennilis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Le Drennec


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=396&lang=en
France, Ardennes