Teloschistaceae Caloplaca albolutescens Growth type crustose Chemical results: Thallus K-, apothecia K+ crimson Often a pioneer species on weakly acidic concrete, cement and brick walls and on church buildings. A thin pale grey or whitish-grey thallus that often appears mottled and has scattered grey soredia. Apothecia can be numerous, initially immersed then sessile, discs orange or brownish-orange. Spores polarilocular, 14-18 x 8-10 µm, septum 1/4 to 1/5 spore length. Micrographs below. Similar: C. teicholyta. Thicker thallus with lobed margins and rarely fertile

Microscope photographs



Caloplaca albolutescens
Wimborne Minster, Dorset. February 2017