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79 The naming of organisms (and plant communities)
not assignable to a family; see also morphotaxon, pleomorphic
fungi, special form.
form species: (1) (palaeo. bot., unoff.) a morphologically delimited
category of a disarticulated organ that, within the context of a
particular comparative study, is perceived to lack unqiue character
states (and thus is assignable to multiple whole-plant species); a
shared organ species (q.v.); see also autapospecies. (2) (prok.,
obsol.) species within a genus characterized by small differences in
morphology.
form-taxon: (mycol.) in pleomorphic fungi, a taxon typified by an
anamorph.
forma: see form.
forma alicuius loci: (zool., unoff., obsol.) proposed for an individual
variety, which in the case of polymorphism, is restricted to a portion
of the range of the respective variety or species.
forma apomicta, [pl. formae apomictae]: (bot., unoff.) an apomict of the
named species.
forma biologica: (bot., obsol.) a biological race.
forma specialis, [f. sp.; pl. formae speciales, f. spp.]: see special form.
forma tempestatis: (zool., unoff., obsol.) proposed to indicate a "generator
variety", seasonal in Lepidoptera.
formation: (1) (phyt., obsol.) an hierarchical rank of a syntaxon, equivant
to class but not covered by the Code. (2) see formulation.
Formenkreise: (unoff.) used for specimens or groups of specimens of an
uncertain infraspecific category.
formula mixture: (cult. pl.) a seed mixture made from known components
to a pre-determined formula for any defined market.
formula, [pl. -ae]: (1) (zool.) modifications of available names throughout
a taxonomic group by the addition of a standard prefix or suffix in
order to indicate that the taxa named are members of that group;
zoological formulae are excluded from the provisions of the Code;
suffixes of family-group names denote ranks, not taxonomic groups,
and do not form zoological formulae. (2) (bot.) a designation of a