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Arthonia ilicina T. Taylor


Thallus a thin or immersed crust, white to yellowish-cream, often bounded by a dark brown prothallus, with embedded, dark brown to black, irregularly rounded to elongate apothecia, to 1mm in diameter, or to 2mm in length if elongated; ascospores mostly 5–6-septate. On nutrient-rich, usually smooth bark, locally frequent in old, oceanic woodland in the north and west. Generally recognisable in the field but part of a large genus in which chemical tests and microscopic examination are important.

Refs: Smith et al. (2009), 163; Purvis et al. (1992), 83; Dobson (2005), 66-7 (photo); Dobson (2011), 73 (photo); Puntillo (1996), plate 3 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/arthonia-ilicina

 
Arthonia ilicina
Arthonia ilicina
On Hazel (Corylus avellana) trunk, Ardilistry, Islay, May 2011, BLS meeting


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Uploaded February 2013, last updated January 2016