Anisomeridium biforme Monoblastiaceae
Anisomeridium biforme

Growth type crustose
Chemical reactions negative. Perithecial wall greenish in K

Common but easily overlooked on shaded, smooth-barked trees

Small, +/- immersed black perithecia (0.3-0.5mm) on thin, white to greyish thallus. Smaller pycnidia often extrude whitish jelly containing conidia. Spores 1-septate, (9)12-16 x 4.5-6(7) Ám, septum 1/2 to 1/3 distance from upper end. Microscope photographs below.

Similar: Anisomeridium polypori and Anisomeridium robustum.
Acrocordia cavata and A. gemmata. Perithecial wall brown in K, larger perithecia and spores


Anisomeridium biforme

Microscope photographs
Anisomeridium biforme


Anisomeridium biforme
Anisomeridium biforme
On salix. Holton Lee, Dorset. November 2012

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