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153 The naming of organisms (and plant communities)<br />

pleomorphic: (1) having many forms. (2) (mycol.) of a fungus having two<br />

or more distinct phases or states in its life-cycle; see anamorph,<br />

holomorph, synanamorph, teleomorph.<br />

pleonasm: the use of generic names and specific epithets with an identical<br />

or similar meaning, either by similar word-forms (e.g. as in Bidens<br />

bidentoides), or different words identical or almost identical in<br />

meaning (e.g. Andropogon barbatus).<br />

plesiogenotype: (zool., unoff.) a specimen provisionally included in a<br />

genus at the time of description of the genus, but which was<br />

subsequently designated as the type of that genus.<br />

plesiomorph: (unoff.) a primitive character; i.e. one that has not changed in<br />

form from that seen in its ancestors.<br />

plesiotype: (1) (palaeo. zool., obsol.) a specimen which was not used in the<br />

original description of a species or subspecies, but which is used for<br />

a later redescription supplementing the description or illustration<br />

published subsequent to the original description; a hypotype; see<br />

also epitype. (2) (zool., unoff.) a specimen related to the type<br />

species of a genus-group name but from another biological province<br />

or geological formation. (3) (zool., unoff.) a figured or described<br />

specimen which has been compared with the type specimen or<br />

original figure. (4) (zool., unoff.) a specimen identified by a later<br />

author as the same as a type.<br />

pliogenotype, [pliogenotyp]: (zool., unoff.) the type of a generic name<br />

which is a synonym of an earlier generic name.<br />

pluviotype: (zool., unoff.) a type specimen damaged in a flood and<br />

encrusted in silt (!).<br />

poecilomorph: (palaeo., unoff., obsol.) proposed as a designation for a<br />

"form-variety".<br />

pollutotype: (zool., unoff.) a type so encrusted or damaged by pollutants<br />

that it is no longer recognizable (!).<br />

polybasic: (zool., unoff.) of a genus-group name, one which had several<br />

species included within it when first published; cfr monobasic.<br />

polybrid: (cult. pl.) a group name for a number of hybrids with the same<br />

parental genera, species, or varieties.

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