Pycnopsis

Pycnopsis is a fungal genus within the family Polyporaceae. It is characterized by its resupinate or effused-reflexed basidiocarps, which are tough and leathery in texture. The pore surface is typically brown to dark brown, and the pores are small and angular. Microscopically, Pycnopsis features a dimitic hyphal system, meaning it possesses both generative and skeletal hyphae. The basidiospores are cylindrical to ellipsoid, smooth, and hyaline.

Taxonomy and History: The genus Pycnopsis was originally circumscribed by Camille Montagne in 1843. Its taxonomic placement within the Polyporaceae family has remained relatively stable, though more detailed molecular analyses continue to refine understanding of the relationships within the family.

Distribution and Habitat: Pycnopsis species are typically found in tropical and subtropical regions worldwide. They are saprophytic, meaning they obtain nutrients from decaying organic matter, and are commonly found growing on dead wood of various broadleaf trees.

Distinguishing Features: Pycnopsis can be distinguished from other polypores by its resupinate to effused-reflexed growth habit, dark brown pore surface, and dimitic hyphal system. Macroscopically, its tough, leathery texture is a key identifying characteristic. Microscopic examination is often required to confirm identification.

Known Species: The genus includes several recognized species, though the exact number varies depending on the taxonomic authority. Some notable species include Pycnopsis malayana. Accurate identification requires careful comparison with existing descriptions and, in some cases, molecular analysis.