Pyrenula macrospora Pyrenulaceae
Pyrenula macrospora

Growth type crustose
Chemical results: K+ yellow, C-, KC-, P+ weak yellow, UV +/- weak yellow

Most frequent Pyrenula species, can be locally common in South and West on shaded, smooth-baked trees.

Mosiac-forming olive-brown to creamy yellow thallus with flecks of white pseudocyphellae and black prothallus. Black perithecia to 1mm, ostiole visible when mature. Spores brown, 3-septate, 25-35 x 8-12 µm. Microscope photograph below.

Similar: P. chlorospila has smaller perithecia (photo below for comparison)


Pyrenula macrospora


Pyrenula macrospora

Microscope photograph

Pyrenula macrospora
Kimmeridge, Dorset and New Forest, Hants. December 2012, January 2013

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