ITALIC 8.0

Rehmia lavata (Fr.) E.J. Möller, Timdal, Haugan & Bendiksby

Fungal Syst. and Evol, 16: 224, 2025. Basionym: Lecidea atroalba var. lavata Fr. - Nov. Sched. Crit.: 18, 1827.

Synonyms: Lecidea lavata Ach.; Lecidea perluta Nyl.; Rhizocarpon confervoides auct p.p. non DC.; Rhizocarpon lavatum (Fr.) Hazsl.; Rhizocarpon obscuratum f. lavatum (Fr.) Th. Fr.; Rhizocarpon orphninum (Vain.) Vain.; Rhizocarpon perlutum (Nyl.) Zahlbr. non auct.; Rhizocarpon pseudorivulare Eitner; Rhizocarpon subcoeruleum Eitner

Distribution: N - Frl (Tretiach & Hafellner 2000), TAA (Dalle Vedove & al. 2003, Nascimbene & al. 2007b, 2022), Lomb, Piem (TSB 33830), VA (Isocrono & al. 2008, Favero-Longo & Piervittori 2009), Emil (Tretiach & al. 2008, Fariselli & al. 2020). S - Cal (Puntillo & Puntillo 2004, Puntillo 2011).

Description: Thallus crustose, episubstratic, grey, pale ochre-brown or rust-brown, epruinose, smooth, rimose, irregularly cracked or areolate, forming up to 12 cm wide patches usually delimited by a dark prothallus, the areoles to 0.4 (-1) mm wide, contiguous, angular, more or less flat, less than 12 per square cm. Medulla white, I-. Apothecia lecideine, (0.4-)0.5-1(-1.6) mm across, immersed in the thallus or slightly protruding, dark brown to black, epruinose, round or irregular due to mutual compression, with a weakly concave to weakly convex, sometimes umbonate disc, and an up to 0.25 mm thick, persistent proper margin. Exciple dark brown in outer part, paler within, K-; epithecium olive-green to greenish-brown, sometimes patchily K+ purple-red or K-; hymenium colourless to pale brown, (100-)135-260(-375) μm high; paraphysoids coherent, branched and anastomosing, hardly swollen at apex; hypothecium dark red-brown, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus that is K/I- in lower part and K/I+ blue near the apex, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, with 6-7 transverse septa and 1-3 longitudinal septa, with (8-)12-21(-28) cells in optical view, long remaining hyaline (older spores sometimes pale brown), ellipsoid to narrowly ellipsoid, 34-44(-50) x (12-)14-29(-25) μm, halonate. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.

Note: a cool-temperate to arctic-alpine, circumpolar lichen found on perennially humid siliceous rocks, e.g. in mountain rivulets, or on small pebbles on moist ground.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

Alpine belt: rather rare

Subalpine belt: rare

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

DOLICHENS

Leif Stridvall http://www.stridvall.se/la/galleries.php

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (33262)
2001/12/10

Juri Nascimbene - CC BY-SA 4.0

Italy, Trentino-Alto Adige

Juri Nascimbene - CC BY-SA 4.0

Italy, Trentino-Alto Adige, Trento, Adamello-Brenta, sorgente c/o Malga Val di Fumo 1853m
2006

Juri Nascimbene - CC BY-SA 4.0

Italy, Trentino-Alto Adige, Trento, Adamello-Brenta, sorgente c/o Malga Val di Fumo 1853m
2006

P.L. Nimis CC BY-SA 4.0

TSB 34347

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Brennilis

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Ardennes

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Saint Herbot

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Saint Herbot

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Saint Herbot

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=499&lang=en

France, Saint Herbot

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Felix Schumm - CC BY-SA 4.0

[1449], GERMANY: Niedersachsen, N. Harz. Auf periodisch inudierten Silikatblöcken im Bachbett der Radau oberhalb der Koleborn-Straßenkehre, 475 m. Leg. Hans Ullrich, 28.07.1963, det. Hans Ullrich. Ex Herbario Hans Ullrich

Photo by E. Timdal. Source: Möller E.J., Timdal E., Haugan R., Bendiksby M. 2025. Integrative taxonomy and genus delimitation in the Rhizocarpaceae (lichenized Ascomycota). Fungal Syst. Evol., 16: 215-231. – CC BY-NC-ND

R. lavatum, Norway, O-L-169833.

Photo by E. Timdal. Source: Möller E.J., Timdal E., Haugan R., Bendiksby M. 2025. Integrative taxonomy and genus delimitation in the Rhizocarpaceae (lichenized Ascomycota). Fungal Syst. Evol., 16: 215-231. – CC BY-NC-ND

Norway, O-L-28923 Scale bars: E = 100 μm; F = 10 μm