fasciatus

Southern Clam Shell

Fomes fasciatus is a perennial polypore that closely resembles the well-known Fomes fomentarius but is distinguished by its subtropical distribution and specific morphological traits. The fruiting bodies are sessile, woody, and typically hoof-shaped to clam-shaped, measuring 7–18 cm in width. The upper surface is marked by distinct concentric zones (fasciations) of gray, brown, and black, often becoming smooth and hard with age. The pore surface is concave to flat, with small, circular pores (4–5 per mm) that are white when fresh but darken to brown upon handling or age. Internally, the context is golden-brown and fibrous, featuring a granular core similar to F. fomentarius. Ecologically, F. fasciatus serves as a white-rot fungus, playing a crucial role in the decomposition of hardwood lignin in warmer climates. Its lifecycle involves the colonization of dead or dying standing timber, where it produces perennial conks that can persist for multiple years. Unlike its temperate cousin, F. fasciatus thrives in higher temperatures and is a common sight in the southeastern United States and Neotropical regions.