Primordial 



A DICTIONARY 



Prole 



PRIMORDIAL, original, or first 

 formed. 



PRIMdR'DIAL gflLL, a cell with- 

 out a cell-wall; naked cell. 



PRIMdR'DIAL EPLDERMiS, the 

 epidermis as it exists when first 

 formed. 



PRIMdR'DIAL LEAVER the first 

 leaves to succeed the cotyle- 

 dons. Applied especially to 

 lower leaves which differ con- 

 siderably from those on the 

 upper portion of the stem. 

 Compare Protophyll. 



PRIMdR'DIAL tT TRICLE.theout- 

 erlayerof protoplasmadjoiuing 

 the cell-wall. The term has 

 with some about the same sig- 

 nificance as Ectoplasm, though 

 it usually refers more particu- 

 larly to the immediate surface 

 of the protoplasm (considered 

 as a membrane, though not 

 really one) rather than to a 

 definite outer layer. The term 

 was first used by Mold and ap- 

 plied to the layer of protoplasm 

 adjoining the cell-wall iu cells 

 which are nearly filled with 

 sap. Upon the application of 

 certain reagents the protoplasm 

 contracts from the wall as a 

 sac, the "primordial utricle." 



PRLMdR'DitJM (pi. Prlmor'dla), 

 any member or organ iu its 

 earliest condition. 



PRl§MAT'IC, in the form of a 

 prism — with flat, longitudinal 

 faces separated by angles. 

 Applied to stems. Compare 

 Terete. 



PROCAM'BiUM, the first formed 

 fibrovascular tissue of an organ 

 before it becomes differenti- 

 ated into xylem and phloem. 

 Compare Cambium. 



PRO CARP, see Procarpium. 



PRO'CARPE (Bornet & Thuret), 

 see Procarpium. 



PROCAR'PlUM (pi. Procar'pia), in 

 Florideae, the female organ (ar- 

 chicarp) before fertilization. 

 It consists of a carpogonium, 

 together with the trichogyne 

 and any other accessory part. 

 Compare Cystocarp. 



PRC-C'flSS, any projection from a 

 surface. 



PROCtTM'BENT, see Prostrate. 



PRODUCED', prolonged; extend- 

 ed; projected. 



PROfiM'BRtO, (1) the Suspensor, 

 which see; (2) formerly applied 

 to a prothallus, or to the first 

 result of the germination of 

 any spore; now restricted to 

 special cases, as the rudiment- 

 ary first stage of the sporophore 

 arising from the oospore in 

 Characese. Compare Promy- 

 celium, Protonema, and 

 Prothallus. 



PROEMBRYON'iC BRANCHES, 



short branches sometimes 

 found on the nodes of Chara 

 fragilis which resemble the 

 profimbryos in structure and 

 serve for reproduction. 



PR6G'AM0u*S, preceding fertili- 

 zation: applied to the cell of 

 the pollen-grain which forms 

 the pollen-tube, in distinction 

 from vegetative cells which are 

 also sometimes found. 



PROGRESSIVE METAMOR'PHO- 

 SlS, the appearance in place of 

 organs of the usual character 

 of those belonging to a higher 

 or succeeding set, as when pet- 

 als are replaced by or "con- 

 verted into" stamens; ascend- 

 ing metamorphosis. Compare 

 Retrogressive Metamor- 

 phosis. 



PRO'LATE, elongated in a polar 

 direction. Compare Oblate. 



PROLE, a useless term applied 

 both to Form and Race. 



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