Irish lichens

Lecanora intumescens

Order: Lecanorales       Family: Lecanoraceae

Species: Lecanora intumescens

Growth type crustose
Photos: On urban tree. Foynes, Co. Limerick, Ireland

Whitsh to pale grey thallus, sometimes with black prothallus. Apothecia reddish brown with swollen margin that becomes undulate and distorted. Older apothecia become much larger in size. Margins appear slightly powdery with protruding hyphae as cortex is lacking. Spores 11.5-18 x 5-8 Ám. Margins lack large crystals but epithecium contains yellow granules dissolving in K. Chemistry: Thallus K+ yellw, C-. Exciple PD+ deep yellow or orange, UV+ pale orange or yellow

Widespread but scarce on smooth-barked deciduous trees.

Similar: L. argentata. Crystals in margins, no granules in epithecium


Lecanora intumescens

Lecanora intumescens

Lecanora intumescens

Lecanora intumescens
Lecanora intumescens. September 2010

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