ITALIC 7.0

Scytinium subaridum (P.M. Jørg. & Goward) Otálora, P.M. Jørg. & Wedin

Fungal Divers., 64, 1: 291, 2013. Basionym: Leptogium subaridum P.M. Jørg. & Goward - Acta Bot. Fenn., 150: 76, 1994.

Synonyms:

Distribution: C - Sar (Aragon & al. 2004).

Description: Thallus minutely foliose, subgelatinous when wet, 100-150 μm thick, forming 1-3 cm wide patches. Lobes rounded to elongate, entire or lobulate, toothed, 1-3 mm wide, smooth to partially finely striate, dark brown to dark greenish brown, with laminal and marginal, clavate to dactyliform, concolorous but apically darker isidia. Lower surface paler than the upper surface, without tomentum. Upper and lower cortex paraplectenchymatous, composed of a single layer of angular cells, the layer inbetween with loosely interwoven chains of Nostoc and hyphae. Apothecia very rare, lecanorine, 0.5-1 mm across, laminal, shortly pedicellate, with a concave, brownish disc and a distinct, isidiate thalline margin. Thalline exciple 20-45 µm wide, corticate; proper exciple euparaplectenchymatous, 20-50 µm wide; epithecium brownish; hymenium colourless, 100-135 µm high, I+ blue; paraphyses mostly simple, c. 2 µm thick at mid-level, the apical cells 3-3.5 µm wide, with external brown pigmentation; hypothecium colourless, 25-40 µm high, of closely compacted hyphae, I+ blue. Asci 8-spored, narrowly clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores muriform, hyaline, ellipsoid, 23-30 x 9-12 µm. Photobiont cyanobacterial (Nostoc, the cells in long chains). Spot tests: all negative. Chemistry: without lichen substances.

Note: a Mediterranean to mild-temperate lichen known from North America, found on the base of old trees, more rarely on schists. According to Jørgensen (in litt.), however, the presence of this species in Europe is dubious. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).

Growth form: Squamulose

Substrata: bark and rocks

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

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: absent

Dry mediterranean belt: very rare

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

Index Fungorum GBIF

Curtis Randall Björk – CC BY-SA 4.0

British Columbia, Clearwater Valley, Third Canyon Uplands Date: 2012-05-04 On calc-modified metamorphic rock in canyon, south facing, open, by creek

Curtis Randall Björk – CC BY-SA 4.0

British Columbia, Clearwater Valley, Third Canyon Uplands Date: 2012-05-04 On calc-modified metamorphic rock in canyon, south facing, open, by creek

Curtis Randall Björk, - CC BY-SA 4.0

British Columbia, Canada
05.10.2018

Manuel Gil

Spain, Canary Islands, Lanzarote