Spore droplets appear golden brown. The spores can be collected from the agar surface by rinsing with sterile water or transferring spore masses to culture media. Identification E. lata can be identified by characteristics of the stromata, asci, and ascospores. Stromata are black, embedded in decorticated wood, are composed of a mixture of fungal and host tissue, and have poorly defined margins. Perithecia, about 0.5 mm in diameter, are distributed irregularly in one layer.
Ostioles are separately erumpent and indistinctly sulcate.
The teleomorph does not develop in culture. After about 2 wk, some cultures develop a gray pigment, and the reverse side may become almost black. After 3-4 wk under continuous fluorescent light, small black pycnidia of the Libertella anamorph are formed. The conidia are exuded in a cream-colored to orange droplet or cirrus. They do not germinate readily in culture.