Slideshow image
Protothelenella corrosa (Korber) H. Mayrh. & Poelt
Family: Protothelenellaceae
[Acrorixis corrosa (Körb.) Trevis.,  more]
Protothelenella corrosa image
Troy McMullin  
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: granular, granulose, granulate | compartimentized – areolate, squamulate [th] upper surface: grey(ish) | green(ish) | yellow(ish) grey | grey(ish) green | grey(ish) brown [th upper surface]: epruinose [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) upper surface: granulose, granular | verrucose, warted ascomata: absent | present ascoma: perithecial, perithecioid – hymenial ascoma [mm]: (low) 0.2 (high) 0.4 (max) 0.5 ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) [ascm] paraphyses/-oids: present asci: fissitunicate – bitunicate [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc) ascospores: (low) 6.0 (high) 8.0 [asp] shape: subglobose, subspherical | broadly ellipsoidal | ovoid, ovate [asp] length [µm]: (min) 16.0 (low) 18.0 (high) 32.0 [asp] width [µm]: (min) 8.0 (low) 10.0 (high) 15.0 [asp] septa: present [asp] septa: muriformly septate – muriform, submuriform [asp] transversal septa: (low) 4.0 (high) 6.0 [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent secondary metabolites: present primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: soil, clay, humus, turf, detritus, dead leaves | rock – siliceous, siliciferous, acidic | rock, stones, pebbles – unspecified.