Scytinium parvum (Degel.) Otálora, P.M. Jørg. & Wedin

Fungal Divers., 64, 1: 291, 2013. Basionym: Collema parvum Degel. - Symb. Bot. Upsal., 13, 2: 273, 1954.
Synonyms: Collema leptogioides auct. p.p. non Anzi
Distribution: N - VG (TSB 5736), Frl (TSB 7946), Lomb. C - Abr. S - Camp (Nimis & Tretiach 2004).
Description: Thallus small-foliose to subcrustose-placodioid, gelatinous when wet, forming up to 1.5 cm wide, orbicular rosettes which often tend to die centrally leaving a ring of lobes. Lobes dull, black to rarely brown-black, neatly radiating, convex to flattened, strongly adpressed, (0.1-)0.2-0.3(-0.4) mm broad, 130-215 µm thick when wet; central parts of thallus with scattered to dense, globose to oblong, up to 0.1 mm thick isidia. Upper and lower cortices only partially developed, sometimes present only on the lower surface, consisting of 1-2 layers of isodiametrical cells, the layer inbetween not paraplectenchymatous, of intertwined hyphae and loosely arranged chains of Nostoc. Apothecia and pycnidia unknown. Photobiont cyanobacterial (Nostoc, the cells in chains, individual cells globose to oblong, 4-7 µm in diam., the surrounding jelly I+ deep wine-red). Spot tests: all negative. Chemistry: without lichen substances.
Note: on steeply inclined seepage tracks of calcareous rocks with colonies of cyanobacteria, most frequent in upland areas; certainly much overlooked or confused with other species in Italy.
Growth form: Crustose
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: extremely rare
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF

Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (5736)
2001/12/04


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/



Pier Luigi Nimis
Italy
TSB 37234