Lempholemma cladodes (Tuck.) Zahlbr.

Lempholemma cladodes (Tuck.) Zahlbr.

Cat. Lich. Univ., 3: 23 1925. Basionym: Collema cladodes Tuck. - Gen. Lich.: 89, 1872

Synonyms:

Distribution: N - Ven (Ravera & al. 2022).

Description: Thallus small-fruticose, homoiomerous, gelatinous when wet, dark olivaceous brown to black, forming spreading cushions, consisting of decumbent to erect, terete, often finely striate, mostly dichotomously branched, 1-2 mm long, 0.1-0.2 mm thick lobes with swollen, up to 0.3 mm wide apices containing initially globose, finally bursting open and cup-like hormocystangia producing hormocysts measuring 25-35 x 10-15 μm. Apothecia (pycnoascocarps) very rare, terminal, globose, 0.2-0.4 mm across, with a convex, blackish disc and a thick, smooth, persistent thalline margin. Proper exciple very thin, of parallel hyphae, K/I-; epithecium yellowish brown; hymenium and hypothecium colourless, I+ reddish brown, K/I+ blue; paraphyses mostly simple, not apically thickened, coherent; hypothecium colourless, K/I+ blue. Asci 8-spored, prototunicate, cylindrical, without a distinct apical apparatus. Ascospores 1-celled, hyaline, globose, 15-20 μm wide. Photobiont cyanobacterial (Nostoc, the individual cells 4-5 μm wide, arranged in chains). Spot tests: all negative. Chemistry: without lichen substances.

Note: on more or less calciferous rocks with periodical percolation of water in cool situations; widespread in the Northern Hemisphere (Scandinavia, North America), but not common; rarely collected in the Alps, being only known from Switzerland, recently found in the Eastern Italian Alps.

Growth form: Fruticose

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly sexual

On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: absent

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

Samul Brinker – CC-BY-SA NC – Source: https://www.inaturalist.org/taxa/223158-Lempholemma-cladodes

Curtis Randall Björk – CC BY-SA 4.0

British Columbia, Clearwater Valley, Flatiron Trail Date: 2009-04-03 On underhang of basalt cliff in open conifer-birch forest, calc-modified by seepage

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Juri Nascimbene CC BY-SA 4.0

Italy, Veneto, BL, Vette di Felte

Manuel Gil

Spain, Canary Islands, Tenerife

Manuel Gil

Spain, Canary Islands, Tenerife

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