Rinodina subpariata (Nyl.) Zahlbr.

Cat. Lich. Univ., 7: 554, 1931.. Basionym: Lecanora subpariata Nyl. - Acta Soc. Sci. Fenn., 26: 30, 1900.
Synonyms: Rinodina degeliana Coppins
Description: Thallus crustose, episubstratic, mostly irregularly spreading, areolate, sorediate, forming small round patches or rarely extended and up to 10 cm in diam., usually without a distinct prothallus, the areoles grey-white or grey-green, irregularly rounded or more or less angular, 0.3-0.8 mm wide, at first flat and adnate, later sometimes tending to become raised at edges and appearing subsquamulose. Soralia pure white, persistently discrete or more rarely more or less confluent, developing marginally on the slightly raised underside of areoles, at first linear, later often more or less labriform; some areoles often completely dissolved into diffuse soralia. Soredia farinose, whitish grey to greyish green, 20-40 µm in diam., often gathered in larger consoredia. Apothecia very rare, lecanorine, sessile, constricted at base, 0.3-0.9 mm across, with a blackish brown, flat disc, and an often sorediate thalline margin; proper margin visible as a more or less prominent, blackish brown parathecial ring. Thalline exciple 60-100 µm wide laterally, with a 10-20 µm thick cortex, the cortical cells not pigmented and mostly hidden by crystals, I+ fainty blue; proper exciple colourless or pale brown, 5-10 µm wide laterally, expanding to 20-30 µm in upper part; epithecium reddish brown, K-; hymenium colourless, (75-)80-90(-120) µm high, not inspersed with oil droplets; paraphyses strongly coherent, 2-2.5 µm thick at mid-level, the apical cells 3.5-4.5 µm wide; hypothecium colourless or very pale brown, 70-100(-140) µm high. Asci (4-)8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, 18-25 x 10-14 µm, Physcia- to Physconia-type, with and ornamented wall and a type A ontogeny (apical wall thickening after the early septum formation). Pycnidia rare, immersed, brown to black. Conidia bacilliform, 3.5-4.5 x c. 1 µm. Photobiont chlorococcoid. Spot tests: K+ yellow, C-, KC-, P+ yellow (rarely P-). Chemistry: atranorin, chloroatranorin, zeorin.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

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

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Rarity

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Curtis Randall Björk CC BY-SA 4.0
Canada, British Columbia, Vancouver Island, Albert Head, on fallen oak near marine shore 2013-10-01


Curtis Randall Björk CC BY-SA 4.0
USA, Idaho, Idaho County, Selway Falls, on conifer twig in wet forest 2012-05-04