ITALIC 8.0

Scytinium euthallinum (Zahlbr.) Otálora, P.M. Jørg. & Wedin

Fungal Divers., 64, 1: 290, 2013. Basionym: Collema leptogioides var. euthallinum Zahlbr. - Österr. bot. Z., 59: 494, 1909.

Synonyms: Collema euthallinum (Zahlbr.) Degel.; Leptogium diffractum var. euthallinum (Zahlbr.) Zahlbr.

Distribution: N - Lig (Giordani & al. 2016). S - Cal (Puntillo 1996).

Description: Thallus small-foliose, gelatinous when wet, forming orbicular, up to 3 cm wide rosettes which often tend to die centrally. Lobes linear or (usually) broader towards apices, dull, dark olive-green to brownish-black, dichotomously branched, radiating, convex to flattened, strongly adpressed to ascending, 0.4-0.7 mm wide, 215-350 µm thick when moist, not pubescent. Isidia sometimes present, globular to flattened, 0.1-0.2 mm wide. Lower surface usually paler, with tufts of white hapters. Upper and lower cortices absent, but a primitive pseudocortex is often developed on both surfaces. Apothecia sometimes present, sessile, 0.5-1.2 mm across, with a flat, red-brown disc, and a usually thin, often disappearing thalline margin. Proper exciple thin, subparaplectenchymatous; hymenium brownish in upper part, otherwise colourless, 110-150 µm high, I+ blue. Asci (4-6-)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 submuriform, with 1-3 transverse septa and 1 longitudinal septum, hyaline, broadly oval to subcubic (13-22 x 10.5-14 µm), or globose (13-17 µm diam.). Pycnidia immersed, globose, pale with a dark apex. Conidia bacilliform, straight, 4-5 x 1.5 µm. Photobiont cyanobacterial (Nostoc, the cells in chains). Spot tests: all negative. Chemistry: without lichen substances.

Note: a Mediterranean species also known from Dalmatia, found on steeply inclined seepage tracks of calcareous rocks; perhaps overlooked and more widespread in Mediterranean Italy, but never common.

Growth form: Foliose, narrow lobed

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: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: very rare

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

Index Fungorum GBIF

P.L. Nimis CC BY-SA 04

TSB 7034

Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.

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

Herbarium: TSB (7034)
2001/12/04