primary 



Pro carp 



'-' Root, the main root developed 

 from the radicle ; '- Shoot, the main 

 stem developed from the plumule ; 

 '- Struc'ture, a nascent organ, as of 

 root or shoot ; '-' Suspen'sor, the 

 filamentous row of cells preceding 

 the actual embryological divisions, 

 the early stage being the pro- 

 embryo ; '-' tape'tal Cell, or Lay'er, 

 the source whence the tapetum is 

 formed by bipartition of a cell or 

 layer of periblem ; the other part 

 of the division becoming the arche- 

 sporium ; Tis'sue, (a) that first 

 formed or (&) formed during the 

 first season's growth ; '~ Wood, the 

 wood developed by the procambium. 



prime'val {primaevus, youthful) For'est, 

 virgin forest which has kept its 

 original character undisturbed by 

 man. 



primigen'ias (Lat., first produced) = 



PIIIMITIVUS. 



Pri'mine, Pri'mina {primus, first), the 

 outer integument of an ovule. 



prim'itive, primiti'vus (Lat., first 

 of its kind), applied to the part 

 first developed ; specific types, in 

 contrast to varieties and hybrids ; 

 '-' "Wall, a boundary between the 

 ooplasm and periplasm of the oosphere 

 in Cystopus Bliti, De Bary (Stevens). 



Pri'mofiliceB, pi. {primo, at first, filix, 

 a fern) a group of Fern-like plants, 

 presumed to be the progenitors of 

 the true Ferns (Arber). 



Primor'dia, pi. of Primor'dium (Lat., 

 the beginning), a member or organ 

 in its earliest condition ; the Ger- 

 man " Anlage " ; primor'dial, pri- 

 mordia'lis, first in order of appear- 

 ance ; '-' Cell, a naked cell, one 

 without a cell-wall ; - Epider'mis, 

 the epidermis when the first formed ; 

 '~' Leaf, an intermediate form be- 

 tween the cotyledon and those of 

 the adult plant produced by growth 

 from the plumule ; -^ Tis'sue, 

 ground tissue ; '-- U'tricle, the 

 outer layer of cell-protoplasm lining 

 the inner surface of a "vacuolated 

 cell ; by some considered the same 

 as EctopLasm. 



Pri'mospore [privivs, first ; (nropa, a 

 seed), term proposed by C. Mac- 

 Millan for those cases in which the 

 spore is but little differentiated 

 from an ordinary cell of the parent 

 organism. 



Primule'tum, Clements's term for an 

 association of Primula. 



pri'or (Lat., earlier), cited by Clements 

 for " earlier, used of alpine aspects." 



prismat'ic, prismat'icus (Lat., like a 

 prism) ; ■~ Lay'er, Farmer's term 

 for a layer of cells in Isoetes sur- 

 roimding the xylem cylinder (Camp- 

 bell) ; prism-shaped, with flat faces 

 separated by angles ; Prismench'- 

 yma {tyx^f^'^j ^^ infusion), pris- 

 matic cellular tissue. 



Pris'on Flow'ers, those which imprison 

 their insect-visitors until fertiliza- 

 tion is eff"ected. 



Proan'giosperms {pro, for, -j- Angio- 

 sperm), an Angiosperm in the act 

 of becoming so from some ancestral 

 form (Saporta and Marion) ; Pro- 

 angiosper'my, the state in question. 



Proanthe'sis {irph, early ; &vdr]ai5, 

 flowering), flowering in advance of 

 the normal period, as some flowers 

 appearing in autumn in advance of 

 the ensuing spring (Pax) ; Pro-antho- 

 strob'ilus ( + Anthostrorilus), the 

 flower of the hypothetic ancestors 

 of the Angiosperms (Arber and 

 Parkin). 



Prob'able Er'ror, see Deviation, pro- 

 bable. 



Probas'id {pro, for, + Basidium), Van 

 Tieghem's term for an organ inter- 

 mediate between a basidium and a 

 sporophore in Basidiomycetes, bear- 

 ing a teleutospore. 



proboscid'eus {proboscis, a snout), 

 having a large terminal horn, as 

 the fruit of Martynia. 



Procam'bium {j)ro, for, -f- Cambium), 

 the embryonic tissue, consisting of 

 somewhat elongated cells, from 

 which the vascular tissue is even- 

 tually formed) ; Pro'carp, Procar'- 

 pium {Kapirhs, fruit), an archicarp 

 with a special receptive organ, the 

 trichogyne. 



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