Inoderma byssaceum (Weigel) Gray

Nat. Arrang. Brit. Plants, 1: 498, 1821. Basionym: Sphaeria byssacea Weigel - Observ. Bot.: 42, 1772.
Synonyms: Arthonia biformis (Flörke) Schaer.; Arthonia byssacea (Weigel) Almq.; Arthonia velana Jatta; Pyrenotea biformis (Flörke) A. Massal.; Pyrenotea byssacea (Weigel) A. Massal.
Description: Thallus crustose, mostly endosubstratic, continuous to finely rimose, very thin to evanescent, whitish to pale brown, ecorticate, usually forming large patches, without a distinct prothallus, the hyphae I+ amd K/I+ pale blue. Apothecia rare, rounded, arthonioid, adnate to sessile, more or less constricted at base, 0.3-1 mm across, 90-210 µm tall, with a slightly to strongly convex, densely white-pruinose disc, without a distinct proper margin. Proper exciple reddish brown, poorly developed, 8–22 μm thick, of paraphysoidal hyphae, densely inspersed by pale granular crystals; epithecium colourless to pale grey to pale brown, inspersed with colourless crystals, 10-25 µm high; hymenium colourless to pale yellowish brown, 45-65 µm high, I+ blue/red and K/I+ blue; paraphysoids forming a loose network between the asci, wavy, 1-1.5 µm thick at base, the apical cells up to 2 µm wide; hypothecium dark brown, of intertwined, branched and anastomosing, prosoplectenchymatous hyphae embedded in a gelatinous matrix, 50-120 µm high. Asci 8-spored, clavate, semifissitunicate, without K/I+ blue tholus structures, Arthonia-type. Ascospores (2-)3-4(-5)-septate, hyaline, narrowly obovate, (11-)13-19(-23) x (4-)5-7(-8) µm, with a slightly larger apical cell, the septation microcephalic, starting in or slightly above the middle and extending downwards. Pycnidia emergent, 0.15-1.4 mm in diam., dark brown to black but thickly white-pruinose at least at the base, flattened to urceolate, with pale brown conidial masses usually protruding from the apical pore, of the Lecanactis-type of Vobis (1980), the wall paraplectenchymatous, dark brown to black, pruinose, K+ greenish black, N+ slowly orange-brown, the conidiogenous cells phialidic, of type II of Vobis (1980). Conidia bacilliform, straight, (4-)5-6 x 1-1.5 µm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: Byssaceum-unknowns, probably 2'-O-methylperlatolic acid and one accessory compound.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Montane belt: absent
Dry submediterranean belt: extremely rare
Humid submediterranean belt: extremely rare
Padanian area: absent

pH of the substrata:

12345
info

Solar irradiation:

12345
info

Aridity:

12345
info

Eutrophication:

12345
info

Poleotolerance:

0123
info

Altitudinal distribution:

123456
info

Rarity

absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map

Liis Marmor CC BY NC -NDrapha%20corticolaHtfld.jpg http://www.eseis.ut.ee/LichenPhoto_2200/Arthonia_byssacea_l2.jpg
Holotype


Collezione lichenologica Abramo Massalongo del Museo di Storia Naturale G. Ligabue di Venezia - Autori: Seggi, Linda; Trabucco, Raffaella Proprietà: Fondazione Musei Civici di Venezia - CC BY-NC
Italy, Veneto, in M. Montello
as Pyrenothea byssacea Massal. (Verr. Byssacea Schl. insculpta Schaer!)


Collezione lichenologica Abramo Massalongo del Museo di Storia Naturale G. Ligabue di Venezia - Autori: Seggi, Linda; Trabucco, Raffaella Proprietà: Fondazione Musei Civici di Venezia - CC BY-NC
Italy, Veneto, in M. Montello
as Pyrenothea byssacea Massal. (Verr. Byssacea Schl. insculpta Schaer!)


Redinger, K. (1938) Arthoniaceae, Graphidaceae . In Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. Band 9, 2 Abt., Part 1 (G. L. Rabenhorst, ed.): 181–404. Leipzig: Borntraeger