Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) endosubstratal, inconspicuous, immersed | crustose (crustaceous) episubstratal unspecified thallus: continuous, diffuse, effuse [th] upper surface: grey(ish) | green(ish) grey | brown(ish) grey | white(ish) grey [th upper surface]: epruinose [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane ascomata: absent | present ascoma: apothecial, apothecioid hymenial ascoma [mm]: (low) 0.3(median) 0.8 (high) 1.2 ascoma: sessile, superficial [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded | subconvex, slightly convex | convex [ascm, if apoth] disc, mazaedium: black(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) [ascm, if apoth] disc, mazaedium: epruinose [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) | red(dish) brown (if pale: orange brown) [ascm, if apoth] margin excipular photobionts: present [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: black(ish) brown | red(dish) brown (if pale: orange brown) [ascm] paraphyses/-oids: present [ascm] paraphyses/-oid cells width [µm]: (low) 1.5 (high) 1.7 (max) 2.0 [ascm] paraphyses/-oid apical cells width [µm]: (low) 2.0 (high) 2.5 (max) 3.0 [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | yellow(ish) brown asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc) ascospores: (median) 8.0 [asp] shape: broadly ellipsoidal | ellipsoidal | oblong, oblong-obtuse [asp] length [µm]: (min) 8.5 (low) 10.0 (high) 16.0 (max) 19.0 [asp] width [µm]: (min) 3.5 (low) 4.5 (high) 6.0 (max) 8.0 [asp] septa: absent spore lumen unilocular, monolocular | present [asp] septa: transversely septate [asp] transversal septa: (min) 0.0 (low) 1.0 (high) 2.0 (max) 3.0 [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent | ornamented, rough, warted, striate, cracked secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous trebouxiaceous, chlorococcoid.
substrate: soil, clay, humus, turf, detritus, dead leaves | bryophytes mosses, liverworts | wood dead, living | bark, cork, plant surface trunks, branches, twigs.
Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus thin or quite thick, verruculose, of granules to 0.15 mm, bluish white or ashy white, esorediate; hypothallus indistinct. Apothecia to 1.2 mm, adnate to moderately constricted; margin of same color as disk, persistent or disappearing; exciple of radial hyphae, reddish brown; disk flat to strongly convex, pale brown, reddish brown, brown-black or black, bare; hypothecium reddish brown or brown-black above, paler below, often with black granules; epihymenium yellowish brown; hymenium hyaline below, yellowish brown above, sometimes with black granules; 70-80 μm; paraphyses slender or tips slightly larger; asci clavate; spores ellipsoid, simple or sometimes 1-septate, 10-14 x 3-5 μm.
Reactions: K—, C—, P—, I—.
This species grows over moss. It is circum-polar and boreal.