Phanerophyle. A woody plant bearing buds more than 25 cm from the ground

Pharynx.
(1) Part of vertebrate gut between mouth and oesophagus into which open glottis in tetrapods, and gill slits in fish. In man nd other mammals, throat and back of nose; partly soft palate into upper (nasal) section and lower (oral or throat) section. Contains sentory receptors setting off swallowing reflex.

(2) Part of gut into which gill slits open  internally in ascidians and amphioxus.

Phase contrast. Method of microscopy in which differences in phase of light from the object viewed are converted into differences in intensity.

Phasmidae. The family of stick and leaf insects

Phenetic. (Describing a relationship or classification) based on maximum observable similarity.

Philopatry. The tendency of an animal to remain in its home area or return to it in the case of migrants.

Phleom. Vascular tissue that conducts synthesized foods, e.g. sugars proteins and some mineral ions, through the plant. Characterized by presence of sieve-tubes and in some plants, companion cells, fibres, and parenchyma cells. Of two kinds, primary, formed by differentiation from procambium and secondary, additional phloem produced by activity of cambium.

Phloroglucin. A dye that with hydrochloric acid, stains lignin bright red in sections of plant material.

Phosphagen. Phosphate of creative, or arginine (an amino acid). Reversible splitting of a phosphate from phosphagen plays important part in providing readily available store of phosphate for ATP in muscle contraction. Creatine phosphate is the phosphagen of ophiuroids, Acrania, and vertebrates; arginine phosphate of most invertebrates and of tunicates; and both phosphagens occur in echinoids and Hemichordata.