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149 The naming of organisms (and plant communities)
perilous name, [nomen periculosum]: (prok.) a name for a taxon where
confusion in the application of the name may lead to accidents
endangering health or life or both, or have serious economic
consequences.
period classification: (palaeo., unoff.) a classification of fossils confined to
records from a named geologic period (e.g. the Cretaceous Albian
Period classification is a 100-classification): see also subtroop.
periodical: a publication issued at intervals; a serial (q.v.) publication.
Permanent Committee (bot.): one of five committees appointed by an
International Botanical Congress mandated to consider
nomenclatural proposals, especially for the conservation or rejection
of names, related to particular groups, viz. Algae, Bryophyta, Fossil
Plants, Fungi, and Vascular Plants.
perplexing name, [nomen perplexum, nom. perpl.]: (prok.) a name the
application of which is known, but which causes uncertainty if used
because the spelling is uncertain or causes difficulty.
personal communication, [pers. comm.]: information received from a
named person verbally or in personal correspondence.
phaenotype: see phenotype.
phagotype, [phage type]: (prok., obsol.) a phagovar (q.v.).
phagovar: (prok.) an infrasubspecific strain of a species distinguished by
its reaction either to a particular bacteriophage (a typing phage), or
by a distinctive pattern of sensitivity to a set of specific
bacteriophages; formerly referred to as a phagotype or phage type;
see also lysotype.
phalanx: (zool., unoff) a rank used at various levels between kingdom and
superfamily, and so of uncertain modern equivalence.
phase: (1) (cult. pl.) a distinct stage in the growth cycle of a plant. (2)
(prok.) in Enterobacteriaceae, a well-defined stage of naturally
occurring alternating variation.
phase type: (zool., unoff.) a type exhibiting a phase different from that of
the holotype (e.g. sex, dimorphic form).