Ephebe multispora (E. Dahl) Henssen

Symb. Bot. Upsal., 18, 1: 46, 1963. Basionym: Spilonematopsis multispora E. Dahl - Meddr Grønland, Biosc. 150, 2: 34, 1950
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Description: Thallus minutely filamentous, brown, forming up to 2 mm wide, loose cushions, consisting of soft, 15-20(-40) μm thick, mostly ascending filaments branching from the base, without a cellular cortex, attached by a basal disc. Apothecia rare, inconspicuous, to 0.1 mm across, developing from pycnidia on swellings on the branches, with a punctiform, dark brown disc and a thalline margin. Hymenium colourless, gelatinous, the upper part brown, I+ blue-green, K/I+ blue; paraphyses sparingly branched, the apices thickened; hypothecium colourless, dense. Asci (8-)16-spored, cylindrical-obclavate, thin-walled, with a K/I+ blue outer layer, without apical dome. Ascospores 1-celled, hyaline, subglobose, 4-6 × 3-5 μm. Pycnidia rare, developing laterally from the filaments. Conidia hyaline, bacilliform, 2-3 x c. 1 μm. Photobiont cyanobacterial (Stigonema); photobiont trichomes with true branchings, i.e. side branchlets formed by periclinal cell divisions in the photobiont trichome. Spot tests: all negative. Chemistry: without lichen substances.
Note: this is the smallest of Ephebe-species, with thalli recalling a Stigonema-cushion; based on a type from Greenland, it is found on humid siliceous rocks; a mainly Arctic species, very rare in the Alps, being known only from the Eastern Alps (Austria); to be looked for in the Italian Alps.
Growth form: Fruticose filamentous
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



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Types in Herbarium O (Oslo) – Source: http://nhm2.uio.no/typephotos/lichens/typephotoS.php?f=O-L-000811e_s.jpg