i(>roceni0 



I*ro-Lycopod 



proce'rus (Lat.), very tall, as a tree. 

 Pro'cess, Proces'sus (Lat., a prolon- 

 gation), any projecting appendage, 

 Proces'sus Hyme'nii, "the acieulae 

 of certain Fungals " (Lindley) ; see 

 also Bands, in fruit of Zostera 

 minor. 

 Prochosi'um (tt/joxwo^'s, a deposition of 

 mud), a succession in an alluvial soil 

 (Clements, 1905). 

 Prochro'matin {pro, for, + Chroma- 

 tin), the substance of nucleoli 

 (Pfitzer) ; Procliro'mogen ( + 

 Chromogen), Palladin's name for 

 the form in which chromogens ap- 

 pear in the cell ; in conjunction 

 with an enzyme it becomes a 

 chromogen ; Prochro'mosome ( -'r 

 Chromosome), a definite collection 

 of chromatin granules in somatic 

 and germ cells, corresponding to, 

 but smaller than, chromosomes 

 (Overton). 

 procrastina'tus (Lat.), deferred ; cf. 



Septio. 

 pT(iOMm''bent, procum' bcTis (Lat., lean- 

 ing forward), lying along the 

 ground. 

 Prodophyti'um {trp'SoZos, a pioneer; 

 {<Pvt6v, a plant), an initial forma- 

 tion (Clements). 

 Prod'romus (Lat., a forerunner)', fre- 

 quently employed in botanic works, 

 which are intended should be 

 followed by more complete treatises. 

 Prod'ucts {product as, brought forth), 

 substances resulting from metabolism 

 or chemical changes in plants. 

 Produc'tTun X {productus, lengthened) 



= Calcar. 

 Pro-em'bryo {ipro, for, + Embryo), (1) 

 in Characeae, the product of the 

 oospore, upon which the Chara- 

 plant develops as a lateral bud ; 

 (2) in Archegoniatae the product of 

 the oospore before differentiation 

 of the embryo ; (3) J the youngest 

 thallus of a Lichen ; proembryon'ic, 

 relating to a 'pro-etnbryo, as the 

 -' Branch in Char a, a propagative 

 body having the structure of a 

 pro-embryo arising from a node of 

 the stem. 



proe'minens (Lat., projecting), used 

 of an unusually extended part. 



Profer'ment {pro, for, fermentum, 

 leaven) = Zymogen ; Pro'file-lie, of 

 leaves, when turned edgewise to 

 strong light (Warming) ; progam'- 

 etal (+ Gamete), of the nature of 

 a Progam'ete, a cell Avhich divides 

 to form gametes, or occasionally 

 passes into a gamete (Hartog) ; 

 Progam'etange, Progametan'ghim 

 {ayyelov, a vessel), resting bodies 

 in Protomyces macrosporus, Unger ; 

 progam'ic (Hartog), pro'gamous, 

 in advai'.ce of fertilization ; the sex 

 fixed before fertilization " (Correns) ; 

 '- Cell, a cell formed in the pollen- 

 grain which lias the sperm-nucleus 

 (Goebel) ; Progameta'tion, employed 

 loy Maire to denote the act of 

 synkaryons becoming proganietes ; 

 Progamet'opliyte {<pvThv, a plant), 

 the plant which produces progametes 

 (Maire) ; Progemma'tion {+ Gem- 

 mation), when stylospores are given 

 off from basidia, new terminal cells 

 being developed from older or basal 

 cells (Nylander) ; progeoestliet'ic 

 (7^, earth ; alad-qriKos, perceptible)^ 

 applied to the root-tip when tending 

 downwards. 



progred'iens (Lat., advancing), ex- 

 tending at one part, and dying in 

 the rear. 



Progress'ion {progressus, an advance), 

 the evolution of an inflorescence by 

 progressive expansion, in sequence 

 of development (Guillard) ; progres'- 

 Bive, advancing ; ~ Metamorph'osis, 

 the appearance of organs in an 

 ascending scale, as when petals are 

 replaced by stamens ; opposed to 



RtTROGRESSIVE METAMORPHOSIS. 



Progym'noBperms {pro, for, -f Gym- 

 nospenn), prototypic Gymnosperms, 

 as Bennettites (Saportaand Marion) ; 

 Pro-Hepat'ic ( + Hepatic), a hypo- 

 thetic original thalloid state of the 

 higher plants (Lignier) ; Prohydro- 

 t'ropism (+ Hydrotropism), turn- 

 ing towards a source of moisture 

 (Macdougal); adj. prohydrotrop'ic ; 

 Pro-Ly'oopod (+ Lycopod), a hypo- 



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