Hydnellum ferrugineum
…measure 4–6 μm; hyphae in the spines are thin-walled, septate, and sometimes branched, measuring 3.5–4.5 μm. The hyphae do not have clamp connections. Hydnellum peckii is similar in appearance, but has an acrid taste, and clamp connections in its hyphae. Hydnellum spongiosipes is readily confused with H. ferrugineum…