resiniferous 



retrogressive 



resin, a resin-duct ; resiniferous, 

 -ru8 (Jero, I hear), secreting resin ; 

 Res'inocyst (Ki5<ms, a bag), hemi- 

 spheric structures in the cell-wall 

 of the hairs of the stem and leaf of 

 Begonia (Schoennett) ; Resino'sis 

 = RESIN-FLUX. 



Respira'tion (respiratio, breathing), 

 the gaseous interchange between 

 the plant and the air in which the 

 plant absorbs oxygen, and gives 

 off carbon dioxide ; Insula'tion - , 

 the plant gives off oxygen in the 

 decomposition of vegetable acids ; 

 Internal ~, gives off carbon dio- 

 xide, but does not absorb free 

 oxygen, as in yeast-fermentation ; 

 Nor'mal <*- , as defined ; Vincula'- 

 tion ~> , oxygen is absorbed, but no 

 carbon dioxide is given off; it 

 occurs in the early stages of ger- 

 mination of oily seeds (Detmer) ; 

 adj. respi'ratory, as ~ Cavity, *- 

 Cham'ber = STOMATIC CHAMBER. 



res'tant (Crozier) ; res' tans (Lat., 

 standing still), persistent. 



restib'ilis (Lat., restored), perennial. 



res'ting, in a dormant state ; ~ Cell, 

 an isolated cell which has passed 

 into a quiescent state ; ~ Nu'cleus, a 

 nucleus not in the act of division ; 

 ^ Pe'riod, the time during which 

 dormancy is maintained, the in- 

 volution period ; ~ Sporan'gium, 

 dormant gonidia of such Fungi as 

 Saprolegma, which ultimately give 

 rise to swarmspores; ~ Spore, a 

 spore with a thick integument, 

 needing time before germinating, 

 usually passing the winter or dry 

 season in a dormant state ; ~ Stage, 

 the resting period ; ~ State, quies- 

 cence, as of winterspores, or dor- 

 mant bulbs. 



resu'pinate, resupina'tus (Lat., bent 

 back), upside down, or apparently 

 so, as when the hymenium of a 

 Fungus is uppermost. 



Resurrec'tion Plants, those which 

 after being dried, when placed in 

 water assume their living position, 

 as Anastatica and Selaginella lepi- 

 dophylla, Spring. 



Retarda'tion, the influence of light 

 on growth in certain structures. 



Re'te (Lat., a net), network; retic'- 

 ulate, reticula'tuSy netted like net- 

 work, as in certain cell- thickening ; 

 <~ veined, netted veined ; reticu- 

 la'ted Ves'sel, one with netted 

 thickenings (Crozier) ; Reticula'- 

 tion, network, the regular cross- 

 ings of threads ; Retic'ulum (Lat., 

 a little net), (1) a membrane of 

 cross-fibres found in Palms at the 

 base of the petiole ; (2) applied 

 to the network of linin in the 

 nucleus ; retif erus (fero, I bear), 

 re'tiform, retiform'is (forma, 

 shape), apparently netted. 



retinacula'tus (Lat.), hooked ; Re- 

 tina'culum (Lat., a tether), (1) the 

 gland to which one or more pollinia 

 are attached in Orchids ; (2) in 

 Asclepiads, a horny elastic body 

 to which the pollen-masses are 

 fixed, the Corpusculum of Bent- 

 ham, Pollen-carrier of N. E. 

 Brown, Translator of the Germans ; 

 (3) the f unicle in most Acanthaceae, 

 which is curved like a hook, and 

 retains the seed till mature. 



retiner'ved, retiner'vis, retiner'vius 

 (rete, a net, nervus, a nerve), net- 

 veined. 



retrac'tus (Lat., drawn back), when 

 cotyledons are so far prolonged at 

 their base as to completely hide the 

 radicle. 



Retort' Cells, special enlarged cuticu- 

 lar cells with an apex more or less 

 recurved in Sphagnum. 



retrocur'ved, retrocur'vus, retrocurva'- 

 tus (retro, backward, curvus, 

 curved), recurved, bent back ; 

 retroflex'ed, retrqflex'us (Lat. ), 

 bent back, reflexed ; retrofrac'ted, 

 retrofrac'tus (Lat.), refracted. 



Retrogression (retrogressus, a 

 movement backward), reversion 

 or development towards simpler 

 organisation ; retrogressive, de- 

 cadent in structure; ^Metamorph'- 

 osis, in teratology the occurrence 

 of organs of lower grade in place 

 of the normal structures, aa 



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