Prostrate 



A DICTIONARY 



Protoplast 



PROSTRATE, lying flat upon the 

 ground, but not rooting; pro- 

 cumbent. Compare Creep- 

 ing. 



PR0TAN'DR6u"S, having stamens 

 which ripen their pollen before 

 the pistils of the same flower 

 are ready for fertilization. 

 Compare Protogynous. 



PRO'TElD, see Albuminoid. 



PRO'TEfN, see Albuminoid. 

 Formerly considered a dis- 

 tinct substance. 



PROTEIN CRYS'TAL, see Crys- 

 talloid. 



PRO'TElN GRAIN, see Aleu- 



RONE. 



PRO' TEN, see Protenchyma. 



PROTEN'CHYMA, a term used 

 by NSgeli for all tissue not of 

 the fibrovascular system; pro- 

 ten. Compare Epenchyma. 

 These terms are little used. 



PROTERAN'DROtJS, see Protan- 



DROUS. 



PROTERAN'THOfJS, having flow- 

 ers which appear before the 

 leaves, as in the red maple. 

 Sometimes improperly used in 

 the opposite sense. Compare 

 Hysteranthous and Synan- 

 thous. 



PROTERdG'YNOtJS, see Protog- 

 ynous. 



PROTHAl/Lf A, pi., see Prothal- 



LIUM. 



PROTHAL'LltJM (pi. Prothal'lia), 

 see Prothallus. 



PROTHAL'LUS, the thalloid struc- 

 ture resulting from the germi- 

 nation of the spore in ferns 

 and other pteridophytes, upon 

 which the antheridia and ar- 

 chegonia are borne; prothal- 

 lium. Extended also to the 

 sexual generation of other 

 plants which have an alter- 

 nation of generations. 



PROTOGflN'ESiS, a term pro- 

 posed by Itocison for repro- 

 duction by budding after the 

 manner of protophytes. 



PROTOGEN'tC, formed in the 

 beginning: said of intercel- 

 lular spaces which are formed 

 at the time the tissues are be- 

 ginning to differentiate. Com- 

 pare Hysterogenic. 



PR0T6G'YN0IJS, having pistils 

 which are ready for fertiliza- 

 tion before the pollen of the 

 same flower is ripe. Compare 

 Protandrous. 



PRO'TO - MER'ISTEM, see Pri- 

 mary Meristem. 



PROtONE'MA (pi. Protone'mata), 

 the proembryo, or confervoid 

 (often branched) filament first 

 formed from the spore in 

 mosses, and upon which the 

 conspicuous moss-plant is de- 

 veloped by budding. 



PROTOPHLO'EM, see P r o - 



PHLOEM. 



PRO'TOPHYL, a cotyledon or 

 other first-formed leaf of a 

 plant; protophyllum. Used 

 mainly in vascular crypto- 

 gams. Compare Primordial 

 Leaves. 



PROTOPHYL'LtfM (pi. ProtophyT- 

 la), see Protophyl. 



PROTOPHYTOlOGY, (1) t h e 

 study of protophytes; (2) fos- 

 sil botany. 



PRO'TOPLASM, the nitrogenous 

 fluid of variable composition 

 found in living cells. It is the 

 vital substance into which all 

 food is assimilated and from 

 which all parts of the plant are 

 formed. 



PRO'TOPLAST (Hanstein), the 

 smallest body of protoplasm 

 capable of individual action, 

 either with or without a cell- 



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