pratal 



primary 



pra'tal {pratum, a meadow), H. C. 

 Watson's term for those p^^^^^^ 

 which grow in meadows or luxu- 

 riant herbage ; praten'sis (Lat.), 

 growing in meadows, or pertaining 

 thereto; Pra'tum (Lat), meadow, 

 the dominant plants are herbaceous 

 and the vegetation closed. 

 Preaecid'iospore {pre, before, + Aeci- 

 diospore), the trichogyne of certain 

 authors (Moreau) ; Preaecid'ium ( + 

 Aecidium), young caeoma, a sorus 

 which precedes the aecidium in 

 Uredine Fungi (Moreau) ; praeangi- 

 osper'mous (+ Angiospeem), exist- 

 ing before the Angiosperms came 

 into being ; Preang'iosperms, early 

 forms of plants previous to the 

 evolution of plants with closed 

 ovaries ; preclepsy'droid (+ Clep- 

 sydroid), the early state of the leaf 

 trace in Ophioglossaceae (Lang). 

 Pre-bract'eole {pre, before, + Brac- 

 teole), the sub-sporal bract in 

 Chara ; it may be restricted to a 

 single swollen cell (Allen). 

 preoator'iuB(Lat., relating to petition- 

 ing), used for a rosary, as the seeds 

 of Ahrus ; /- contex'tus, necklace- 

 shaped, moniliform. 

 pre'cius (Lat.), preco'cious=PRAEcox. 

 predom'inant, "very conspicuous" 

 (Braithwaite) ; in excess (Leighton). 

 Prefertiliza'tion {jpi-e, before, + Fertil- 

 ization), the early state of an ovule 

 as far as completed pollination ; 

 Preflora'tion = Praefloration ; 

 Prefolia'tion = Praefoliation ; 

 Prefonna'tion {foi-moUio, a shap- 

 ing), the theory of the function of 

 germ-plasm, a complex substance 

 whose ultimate factors direct the 

 vital activities of the cell, and 

 resultant form of the plant ; Pre- 

 liau8tor'iTun(-l-HAUSTORiUM), papil- 

 late epidermal cells of Cuscuta, by 

 which nutriment is obtained before 

 the formation of haustoria (Peirce). 

 prehen'sile {prehensio, a seizing) Type, 

 those flowers whose insect visitors 

 grasp the style and stamens so as 

 to cover their breasts with pollen 

 and so efifect crossing (Delpino). 



premeiot'ic (?Jre, before, -f meiotic), 

 previous to reducing divisions in 

 karyokinesis. 

 premorse' (Crozier) = praemorse. 

 Prepo'tency {pre, before ; potentia, 

 power), the quality by which certain 

 pollen fertilizes a given pistil, in 

 preference to other pollen ; Prere- 

 duc'tion (-f Reduction), a reduc- 

 tion occurring in metaphase of first 

 mitosis (Moreau). 

 Presenta'tion {praesentatio, a placing 

 before) Time, the period required for 

 an organ to take up perception 

 (Macdougal). 

 Pres'sure {pressura, a pressing), stress 

 or distributed force causing turgor 

 or compression ; root~, pressure ex- 

 isting in the root- tissues tending to 

 cause the rise of liquid in the stem. 

 Presynap'sis {pre, before, -f Synapsis), 

 the condition of nuclear division 

 before the stage known as synapsis ; 

 adj. presynap'tic ; preventit'ious 

 {venio, I come) Buds, dormant eyes, 

 present on any given portion of the 

 stem, which produce epicormic 

 branches (Hartig) ; prever'nal {ver- 

 nalis, of the spring), early spring 

 flowering. 

 Prickle, outgrowths of the rind or 

 bark, as those of the rose ; prickly, 

 armed with prickles. 

 pri'mary, prima'rhis (Lat., cliief), (1) 

 used of the part first developed ; 

 (2) the main divisions of a leaf or 

 umbel ; '- Ax'is, the main stem ; 

 '~ Bast, consists of sieve tissues 

 and parenchyma ; -' Cor'tex, the 

 Periblem ; -^ Des'mogen, = Pro- 

 cambium ; -^ Lamella, of a spore, 

 is the outermost layer of its coats, 

 representing the original wall ; 

 '- Lay'er, see " tapetal cell " (infra) ; 

 -^ Leaves, the primordial leaves; 

 -^ Meg'aspore, megaspore mother- 

 cell, the early stage of the embryo- 

 sac ; <- Mem'bers, the primary shoot 

 and root ; <-' Mem'brane, the first (?) 

 cell- wall ; -^ Merlstem, the embry- 

 onic tissue of a young organ ; -^ 

 Petiole, the main rhachis of a com- 

 pound leaf ; -- Phlo'em = ~ Bast ; 



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