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In some species, however, the paraphyses are rare, and the mucilaginous substance is entirely wanting.

Still further examination will show that this fructification consists of cylindrical asci, each enclosing eight elliptical sporidia, closely packed together, and mixed with slender threads called paraphyses.

These asci are generally intermixed with slender, empty asci, or sterile cells, called paraphyses.

The spore-bearing cells are basidia; the others are called paraphyses.

F, spore sacs and paraphyses of Usnea, × 300.