Laetiporus persicinus: This is a large polypore growing in a rosette and is often 30-45 cm (12 -18 inches) wide. It has white pores and grows on the ground in Eastern North America. The soft marginal area should be cut for use since it becomes hard and tough toward the middle. It is closely related to Laetiporus sulphureus (the sulphur shelf) with bright yellow pores but it grows shelf-like on wood and is also a fine edible.