SEPTUM STRUCTURE IN SPINIGER MEINECKELLUS

The structure of the hyphal septum in Spiniger meineckellus is of the dolipore type and is basically like that reported for other Holobasidiomycetes. The septum forms centripetally across the hypha and is accompanied by invagination of the plasmalemma. That portion of the septum surrounding the single central pore enlarges to form a septal swelling. The laminate central region of the septum wall extends through the septal swelling to the edge of the pore. On both sides of the septum there is a convex, laminate, electron‐dense, perforate septal cap that covers the septal swelling and pore. The septal cap is sometimes continuous with endoplasmic reticulum that extends along the septum. Two electron‐opaque rings surround the septal pore and rest on the shoulders of the septal swelling. Small, fine, dark filaments extend from these rings to narrow electron‐dense bands inside the pore.