A Grammatical Dictionary of Botanical Latin

-cybe,-es (s.f.I): in Gk. comp. the head (of a mushroom); the noun suffix retains the terminal Greek eta [> Gk. kybE,-es, ‘head’ (Liddell & Scott)]; this suffix does not occur in –a,-ae (s.f.I), and so is declined like raphe,-es (s.f.I), a seam, suture; see ‘first declension (2);’

NOTE: there is no adj. –cybus,-a,-um (adj.A): nor a generic name ending in –cyba,-ae (s.f.I).

These are declined in Latin:

       singular              plural
   NOM. Clitocybe   Clitocybae              -cybe,-es, ‘head’ (s.f.I)
   GEN. Clitocybes  Clitocybarum
   DAT. Clitocybae  Clitocybis
   ACC. Clitocyben  Clitocybas
   ABL. Clitocybe    Clitocybis

From Gk. klitos, ‘slope’ + kybE, head,” Sloping Head Fungus, “a genus of white-spored agarics with flat or funnel-shaped pileus and elastic stem” (WIII).

Acarocybe, Agmocybe; Agrocybe;; Calocybe, Clitocybe, Coniocybe, Dermocybe, Gloeocybe; Inocybe; Leucocybe; Naetrocybe; Psilocybe; Rhizocybe, Sporocybe

Gymnocybe Fr. is a generic name (Aulacomniaceae)

Aulacomnium subg. Gymnocybe

- eurycybe,-es (as epithet: noun in apposition) with a broad head (Asteraceae)

- Acacia microcybe, with a small head; the epithet is a noun in apposition to the generic name.

- Hieracium melanocybe the epithet is a noun in apposition to the generic name.

Note: given an adj. ending –cybeus,-a,-um (adj.A): Sematophyllum angusticybeum

Note: diminutive: Acarocybe becomes Acarocybella M.B. Ellis