• Arthopyrenia fraxini A. Massal.

There are no records for this species at present.

This small ‘bark-pimple’ species (discs 0.2–0.4mm diam.) first described from ash bark, grows on a variety of hosts. Thallus: no more than a pale brown blotch, so could be readily overlooked for A. analepta (described elsewhere), except for the K- involucrellum. A squash of the spores (19–26µm long) bears comparison with A. punctiformis (described elsewhere), which has much smaller discs (0.1–0.23mm diam.) and spores (16–20µm long). In Ireland, the species is scattered.

Key characteristics

  • • In the field rather like A. analepta; suspicious material should be squashed or sectioned for examination under the microscope
  • • Spores like those of A. punctiformis but larger; on ash, alder, holly.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthopyrenia fraxini A. Massal.. [In] LichenIreland. Accessed on 2019-01-16.