Palicella filamentosa (Stirt.) Rodr. Flakus & Printzen
Lichenologist, 46: 540, 2014. Basionym: Lecidea filamentosa Stirt. - Scott. Natural., 5: 218, 1879
Synonyms: Lecanora filamentosa (Stirt.) Elix & Palice; Lecanora ramulicola (H. Magn.) Printzen & P.F. May; Lecidea hercynica M. Hauck & Schmull; Lecidea ramulicola (H. Magn.) Hillm. non H. Magn. (1952) nec H. Magn. (1953); Lecidea saepincola Ach. var. ramulicola H. Magn.
Distribution:
Description: Thallus crustose, whitish, endo- or episubstratic and 0.1-0.4 mm thick, rimose-areolate to strongly warted, rarely delimited by a white prothallus. Apothecia sometimes cryptolecanorine when young, but usually appearing biatorine, rounded to irregular in outline, frequently crowded and coalescing, adnate to sessile, 0.3-0.6 mm across, with a cream-coloured, red-brown to brown-black, flat to convex disc, a concolorous to slightly paler, thin, hardly raised, finally often excluded proper margin, and (in young apothecia only) an ephemeral thalline margin. Proper exciple yellow-brown to orange brown in outer part, colourless within, 33-50 μm wide laterally, of of strongly gelatinized, branched and anastomosing, radiating hyphae with strongly elongate lumina; epithecium yellow brown to orange-brown, with a layer of coarse granules dissolving in K but not in N, and with a brown pigment reacting K+ greenish brown or greyish brown; hymenium colourless, 40-70 μm high; paraphyses lax in K, moderately branched and anastomosing, 1.2-2 μm thick, the apical cells not markedly wider; hypothecium colourless, 15-80 μm high. Asci 8-spored, the tholus I+ blue, with a wide axial body that is mostly surrounded by a distinct darker staining layer (Lecanora/Lecidella-type). Ascospores 1-celled, hyaline, narrowly ellipsoid, (10-)12.5-13.5(-16) x (3.5-)4-4.5(-5) μm. Pycnidia black, immersed. Conidia thread-like, 11-15 x c. 1 μm. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P+ yellow. Chemistry: thallus with atranorin and traces of usnic acid.Note: mainly on wood, but also on acid bark in montane coniferous forests; known from a few station in the Eastern Alps (Austria), but certainly more widespread, the distribution being poorly known due to frequent misidentifications, especially with Lecanora symmicta. To be looked for in the Italian Alps.
Growth form: Crustose
Substrata: bark and lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
Predictive model
Einar Timdal .- CC BY.SA NC Einar Timdal, Natural History Museum, University of Oslo, Norway
Growth form: Crustose
Substrata: bark and lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
Predictive model
Index Fungorum
GBIF
