Epichloë typhina, a parasitic fungus called grass choke disease, growing on Dactylis glomerata, known as cock's-foot or orchard grass.

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Keywords: ascomycete, choke, cocks-foot, dactylis, disease, endophytic, epichloë, fungal, fungi, fungus, glomerata, grass, hypocreales, mat, orchard, parasitic, pathogen, plant, spore-bearing, sterile, stromata, symbiosis, typhina