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Placopsis gelida (L.) Lindsay
Family: Trapeliaceae
[Lecanora gelida (L.) Ach.,  more]
Placopsis gelida image
Stephen Sharnoff  
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified | placodioid-crustose, placodioid-foliose thallus: cracked, fissured, fractured, rimose | compartimentized – areolate, squamulate [th] upper surface: white(ish) | white(ish) brown (beige) [th marginal and upper surface] specific structures: absent | present [th margin] cilia, cilioid structures: absent [th upper surface] isidia, isidioid structures: absent [th upper surface] soredia, soralia, soralioid structures: present ascomata: absent secondary metabolites: present secondary metabolites: gyrophoric acid | lecanoric acid primary photobiont: present secondary photobionts (eg in cephalodia): present primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: rock – siliceous, siliciferous, acidic | rock, stones, pebbles – unspecified.
Placopsis gelida image
Lucy Taylor  
Placopsis gelida image
Stephen Sharnoff  
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