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Dermatocarpon arnoldianum Degel.
Family: Verrucariaceae
Dermatocarpon arnoldianum image
Lucy Taylor  
Life habit: lichenized (mutualistic with algal photobionts) thallus: peltate, umbilicate [th] upper surface: green(ish) | grey(ish) brown [th marginal and upper surface] specific structures: absent ascomata: absent | present ascoma: perithecial, perithecioid – hymenial [ascm] paraphyses/-oids: absent asci: fissitunicate – verrucarialean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): absent ascospores: (median) 8.0 [asp] length [µm]: (low) 13.0 (high) 15.0 [asp] width [µm]: (low) 4.5 (high) 6.5 [asp] septa: absent – spore lumen unilocular, monolocular [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: rock – siliceous, siliciferous, acidic.