Acrocordia gemmata Monoblastiaceae
Acrocordia gemmata

Growth type crustose
Chemical results negative. Perithecial wall remains brown in K

Widespread on mature, rough-barked trees, especially Ash, Oak and Elm, rare on smooth-barked trees.

Thin white or light-grey thallus, large black perithecia (0.5-1mm diam), the ostioles +/- off-centre. Some scattered pycnidia. The spores are colourless, 1(-3) septate, 15-27(-30) x 8-12 Ám. Microscope photographs below.

Similar: Acrocordia cavata Scarce, smaller perithecia and spores
Anisomeridium biforme. Smaller perithecia and spores, perithecial wall green in K


Acrocordia gemmata

Acrocordia gemmata

Microscope photographs
Acrocordia gemmata

Acrocordia gemmata
Acrocordia gemmata
Studland and Badbury Rings, Dorset. November 2013 and March 2016

All images used are copyright. Please contact me if you find errors.