Caloplaca ruderum Teloschistaceae
Caloplaca ruderum

Growth type crustose
Chemical results: K+ crimson

On old calcareous walls with soft lime or mortar, rare on coastal calcareous rocks. Most frequent on the south side of old churches in SE England.

The areolate yellowish, yellow-grey or yellow-ochre thallus is thick, lumpy and white-pruinose. Apothecia can be numerous and often become distorted, the discs brownish-orange and surrounded by a thick thalline margin. Spores polarilocular, 10-15 x 6-8 Ám, septum 3-5 Ám wide.

Similar:Caloplaca decipiens and Caloplaca saxicola


Caloplaca ruderum

Caloplaca ruderum
Caloplaca ruderum
Wool, Dorset. February 2013

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