Collema ryssoleum (Tuck.) A. Schneid.
Guide Study Lich.: 181, 1898. Basionym: Collema nigrescens var. ryssoleum Tuck. - Lich. Calif.: 34, 1866.
Synonyms: Collema meridionale Hue; Collema nigrescens f. rupestre (Bagl.) Zahlbr.; Lathagrium nigrescens var. rupestre Bagl.
Distribution: N - Lig (Watson 2014, Giordani & al. 2016). C - Tosc (Pišút 1997, Tretiach & al. 2008), Laz (Tretiach 2004, Genovesi & al. 2011), Sar (Nöske 2000, Rizzi & al. 2011). S - Camp (Nimis & Tretiach 2004), Cal (Puntillo 1996), Si (Grillo & al. 1996, Ottonello & Romano 1997, Grillo 1998, Grillo & Caniglia 2004, Ottonello & al. 2011).
Description: Thallus foliose, homoiomerous, subgelatinous when wet, membranous and adnate, broadly lobed, 1-6 cm in diam. Lobes 0.5-1 cm wide, 50-85 µm thick when wet, rounded and often somewhat ascending at apex, densely pustulate and coarsely ridged, dark olive-green to brown or rarely black, often pale yellowish brown in older parts. Lower surface greenish brown, with a few, scattered, white hapters. Upper and lower cortices absent. Apothecia common, lecanorine, crowded, 0.5-1.5 mm across, with a flat to convex, brownish red to black disc and an entire, persistent thalline margin. Thalline exciple usually pseudocorticate; proper exciple thin, euthyplectenchymatous; epithecium brownish; hymenium colourless, 85-110 µm high; paraphyses coherent, simple or sparingly branched, 2-3 µm thick at mid-level, the apical cells swollen; hypothecium colourless or pale yellow. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores 4-7-septate, hyaline, ellipsoid to fusiform, straight or slightly curved, 22-47 x 4-11 µm. Pycnidia immersed or semi-immersed, on both sides of the thallus, pale. Conidia bacilliform or with slightly swollen ends. Photobiont cyanobacterial (Nostoc, the cells in long chains). Spot tests: all negative. Chemistry: without lichen substances.Note: a mild-temperate, mainly western species in Europe, found on steeply inclined seepage tracks of moderately acid to basic siliceous rocks at low elevations; restricted to the Tyrrhenian ecoregion in Italy.
Growth form: Foliose, broad lobed
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: rather rare
Humid mediterranean belt: rather common
Dry mediterranean belt: absent
Predictive model
Herbarium samples
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9424)
2001/12/04
Manuel Gil
Spain, Canary Islands, Barranco Chafaril, Lanzarote
Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.
Manuel Gil
Spain, Canary Islands, Tenerife
Manuel Gil
Spain, Canary Islands, Tenerife
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Growth form: Foliose, broad lobed
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: rather rare
Humid mediterranean belt: rather common
Dry mediterranean belt: absent
Predictive model
| Herbarium samples |
Index Fungorum
GBIF
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9424)
2001/12/04
Manuel Gil
Spain, Canary Islands, Barranco Chafaril, Lanzarote
Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.
Manuel Gil
Spain, Canary Islands, Tenerife
Manuel Gil
Spain, Canary Islands, Tenerife
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -
France, Nonza - Corse
25/10/2012
