cystidium

Ainsworth & Bisby's page 188;

cystidium (pl. -ia), a sterile body, frequently of distinctive shape, occurring at any surface of a basidioma, particularly the hymenium from which it frequently projects (Fig 12). Cystidia have been classified and named according to their:

(1) origin: hymenial- (tramal -), originating from the hymenial (tramal) hyphae; pseudo-, derived from a conducting element, filamentous to fusoid, oily contents, embedded not projecting; coscino-, see coscinoid; skeleto-, the apical part of a skeletal hypha (frequently +- inflated) projecting into or through the hymenium; false seta; macro-, arising deep in the trama in Lactario-Russulae; hypho- hypha-like, derived from generative hypha.

(2) position (first by Buller, 2): on the pileus surface (pileo-, dermato-, Fayod); at the edge (cheilo-), side (pleuro-), or within (endo-) a lamella; on the stipe (caulo-).

(3) form: lepto-, smooth, thin-walled; lampro-, thick-walled, with or without encrustation (setiform lampro-, awl-shaped, wall pigmented; asteroseta, a radially branched lampro-; microsclerid, a versiform, endolampro-; lyo- cylindrical to conical, very thick-walled, abruptly thin-walled at apex, not encrusted, colourless, as in Tubulicrinis (Donk, 1956); monilioid gloeo-, (torulose gloeo- (Bourdot & Galzin, 1928); moniliform paraphysis (Burt, 1918); pseudophysis; schizo- (Nikolayeve, 1956, 1961)), monilioid, frequently with a beaded apex (as in Hericiaceae and Corticiaceaecontents: gloeo-, thin-walled, usually irregular, contents hyaline or yellowish and highly refractile; chryso-, like lepto- but with highly staining contents; hypo-, (Larsen & Burdsall, Mem. N.Y. bot. Gdn 28: 123, 1976); oleo-, having an oily resinous exudate; pseudo-, see (1) above. See also hyphidium, seta.