Petractis clausa Incertae sedis
Petractis clausa

Growth type crustose
Chemical reactions negative. Photobiont Scytonema (cyanobacteria)



Spores mostly 3-septate with distinct perispore, (15-)17-23(-35) x 5-7 Ám excluding perispore. Microscope photographs below.

Similar: Petractis nodispora, photobiont Trentepohlia.
Gyalecta jenensis, photobiont Trentepohlia, submuriform spores


Petractis clausa

Petractis clausa

Microscope photographs
Petractis clausa

Petractis clausa

Petractis clausa
Petractis clausa
Canford Magna and Ulwell Gap, Dorset. January 2016

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