Epichloe clarkii is a fungal growth that affects Creeping Soft-brome (Holcus mollis) and Yorkshire-fog (H. lanatus) grasses. One or more internodes all round and mostly over their total length, wrapped in a white, later yellowish fungal mass (stroma). The internodes are hardly or not at all swollen.

Other Epichloe species are found on other host plants

host

Please include a photograph.  The host grass species must be identified and a note included with your record in the comments section.

Not well recorded, but seems to be widely distributed in Britain.

Status in Leicestershire and Rutland not known.