 Microscopically, the fungus features a dimitic hyphal system, generative hyphae with clamp connections, and dendrohyphidia (small, spiderweb-like hyphae)–a characteristic, which although common in the family Corticiaceae, is seldom encountered in the Polyporaceae.The spores of "Fuscocerrena portoricensis" are hyaline, cylindrical, and non-amyloid, measuring 5–7 by 2–2.5 μm.