Laetisaria
Laetisaria is a genus of fungi in the family Corticiaceae. Basidiocarps are effused, corticioid, smooth, and grow as plant pathogens on grasses or agave leaves, or as lichenicolous fungi on lichens, or on dead wood. Laetisaria fuciformis is of economic importance as the cause of "red [thread disease]" in turfgrass.