• Lecanora intumescens (Rebent.) Rabenh.
Lecanora intumescens
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(Map updated: 11 August 2009)

This crustose bark epiphyte is similar to Lecanora chlarotera (discs to 1.5mm diam.). It differs in that it has some of its red-brown, frilly-edged discs expanding to almost twice the normal size (2.0-3.0mm diam.) of that species and has white swollen rims which appear inflated like an inner tube, hence its knockabout name ‘Lecanora innertube-escens’. If tested with Pd the rims turn Pd+ deep yellow-orange. It grows mostly on smooth bark in woodland situations, but is not common. In Ireland, the species is widely scattered.

Key characteristics

  • Thallus smooth, discs red-brown, large with inflated, frilly rims — like a jam tart with a thick pastry crust; rims Pd+ deep yellow orange
  • Deciduous smooth-barked trees.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecanora intumescens (Rebent.) Rabenh.. [In] LichenIreland. Accessed on 2019-08-19.