Arthopyreniaceae Arthopyrenia analepta Growth type crustose Chemical reations negative Early coloniser on smooth, +/- shaded bark of twigs and small branches Thin or evanescent non-lichenised thallus without orange colour when scratched (Trentepohlia absent). Large, oval perithecia 0.3-0.6 mm long, base of discs with halo-like shadow, pycnidia occasional. Asci 8-spored,the spores 1-septate with a wide, colourless perispore, 15-23 x 5.5-8 µm. Involucrellum dark brown, K+ green. Microscope photographs below. When on Birch can be confused with Leptorhaphis epidermidis

Microscope photographs




Arthopyrenia analepta
On Apple and Birch. Parkstone and Holton Lee, Dorset. October, November 2012 and April 2013