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26 Terms used in Bionomenclature<br />
the series of which proves to belong to a mixture of several (usually<br />
closely related) species. (4) (zool., unoff.) an inadequately<br />
designated or labelled type specimen that is found to be stored or<br />
mounted with other specimens also fitting the exact description.<br />
ambiguous name, [nomen ambiguum, nom. ambig.]: (obsol.) a name<br />
used in different senses which has thus become a source of error and<br />
confusion; a name applied by different authors to different taxa.<br />
ambiregnal: of an organism that can be treated as belonging to more than<br />
one kingdom according to different taxonomic opinions; used<br />
specially for taxa treated under different Codes by different authors.<br />
ambisense: (vir.) applied to an RNA molecule which comprises positive<br />
sense parts and negative sense parts; both it, and its complement, act<br />
as messenger RNAs.<br />
amended: altered; see emended.<br />
amendments: (bot., prok.) see proposals.<br />
American Code: (bot., obsol.) the Code of Botanical Nomenclature<br />
produced by the Botanical Club of the American Association for the<br />
Advancement of Science in 1904, but not accepted at the<br />
International Botanical Congress in Vienna in 1905; superseded by<br />
the International Code of Botanical Nomenclature (q.v.),<br />
American Code typification: (bot.) see mechanical methods.<br />
American Ornithologists' Union Code: (zool., obsol.) a forerunner of the<br />
International Code of Zoological Nomenclature (q.v.), prepared in<br />
1885.<br />
ampersand, [&]: and; see et.<br />
amphiapomict, [aapm.]: (bot., unoff.) used as a ternary epithet to<br />
distinguish a series of apomicts, e.g. Festuca vivipara aapm.<br />
jemtlandica.<br />
amphidiploid: a plant formed by the sexual union of two unlike parents<br />
with subsequent doubling of both chromosome sets, forming in<br />
effect a tetraploid. The reduplication of chromosomes forms pairs<br />
which may function as such in reproduction, and the process can<br />
thus give rise to a new taxon recognized taxonomically as a species<br />
and therefore is not treated nomenclaturally as a hybrid.
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