Protoblastenia calva Psoraceae
Protoblastenia calva

Growth type crustose
Chemical results: Apothecia K+ crimson

Only found on hard limestone. N.B. Many British records of P. calva are of Protoblastenia lilacina, its apothecia K- or with only a very weak reaction

The smooth, cracked, white or pale-grey thallus is +/- immersed with large (to 1.5mm), convex, deep-orange apothecia initially in shallow pits.

Similar: P. rupestris. Common on mortar and calcareous rocks, comparison below.


Protoblastenia calva

Protoblastenia calva

Protoblastenia calva and Protoblastenia rupestris

Protoblastenia calva
Protoblastenia calva
Godlingston Hill, Studland and Wool, Dorset. October 2012, February 2014, March 2017

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