Torsion 



trajectile 



tion of support ; homod'romous -^ , 

 in the same dii'ection as twining, 

 the internode gyrating in the same 

 way ; Tor'sion-sym'metry (+ Sym- 

 metry), Schuett's term for those 

 Diatoms whose valves are twisted ; 

 tor'sional, in a twisting manner ; 

 '*' Response', when stimulus is ap- 

 plied laterally to an organ (Bose) ; 

 torsi'vus (Mod. Lat., squeezed out), 

 spirally twisted, not quite as in 

 contorted, there being no obliquity 

 in the insertion, as in the petals of 

 Orchis ; tor'tilis (Lat., twisted), 

 susceptible of twisting ; Tort'ism, 

 Schwendener's term for Tropism ; 

 tor'tus, twisted ; tor'tuous, iortuo'- 

 sus, bent or twisted in different 

 directions. 



tonila'ceous (+ aceous) ; tor'uloid, re- 

 sembling the genus Torula, Pera. 



tor'ulose, torido'sus [toriclus, muscular 

 part), cylindric, with swollen por- 

 tions at intervals, somewhat monili- 

 form; -^ Bud'ding, inoreasing by 

 budding as yeast. 



Tor'us (Lat., a bed), the receptacle of 

 a flower, that portion of the axis on 

 which the parts of the flower are 

 inserted ; when elongated it becomes 

 the GoNOPHORE and Gvnophore ; 

 '-' of Pits, the thickening of the 

 closing membrane in bordered pits. 



Toach'wood, decayed wood due to 

 Fungus-mycelium, formerly used as 

 tinder. 



Tox'in {ro^iKhv = poison), in botany, 

 a poisonous secretion by certain 

 Fungi, which kills the cells of the 

 host -plant and facilitates parasitism. 



Trabec'ula, pi. Trabec'ulae (Lat., a 

 little beam), a cross-bar, (1) the 

 transverse bars of the ceeth of the 

 peristome in Mosses ; (2) plates of 

 tissue forming partial septa in the 

 microsporangium of Isoetes ; (3) the 

 lacunar tissue in Sdaginella, be- 

 tween the cortex and the central 

 bundle; trabec'ular, like a cross- 

 bar ; '- Duct, '-' Ves'sel, a vessel 

 with cross-bar markings ; trabec'u- 

 late, trabecula'tus, cross-barred ; 

 Trab'ecule = Teabecula ; trabec'u- 



lose, used of reticulating fibrils in 

 Lichens. 

 Trace, a strand of vascular tissue 

 connecting a leaf with the stem, 

 etc.; '-' -gap, the gap in the wood 

 caused by the passage of a leaf- 

 trace bundle in the stele. 

 Tra'cliea (Lat., the windpipe), a spiral 

 duct or water-conducting vessel aris- 

 ing by cell-fusion ; used by De Bary 

 to include Tracheid also; tra'cheal, 

 belonging to or resembling ti'acheae ; 

 '-' Cells, tracheids ; '^ of the vaa'- 

 cular bundles, the woody portion, 

 the cribrose part associated with 

 bast ; tra'cheary = tracheal ; 

 Tra'cheid {eUos, resemblance), an 

 elongated closed cell of the wood 

 having secondary thickening and 

 conducting water ; the vasiform 

 wood-cell of Goodale ; --' Seam, a 

 group of peculiarly tnickened cells 

 found in the leaves of Conifers on 

 both sides of the vascular bundle, 

 and formerly regarded as part of 

 the transfusion tissue; aut'umn -^j 

 having thicker walls and smaller 

 lumina than spring «*, produced 

 early in annual growth ; trache'idal, 

 pertaining to tracheids ; Trachen- 

 ch'yma {eyxvfia, an infusion), tissue 

 composed of tracheids or spiral 

 vessels ; Tra'cheome, stated by 

 Potonie not to be the tiacheal, but 

 the hydral system of the bundle, 

 he therefore names it Hydrome. 



trachycar'pous, -jms {rpaxvs, rough 

 to the touch ; Kaprrhs, fruit), rough- 

 fruited ; trachysper'mous, -mus, 

 [airfpfxa, a seed), rough-seeded. 



Tractel'lum {tractus, dragged), the 

 anterior flagellum of the zoospore 

 of Saprolegnieae (Hartog). 



Trac'tion {tractus, a dragging) Fi'bres, 

 certain fibres in the mitotic spindle 

 attached to the chromosomes. 



Trag'acanth, a gum which flows from 

 Astragalus Tragacantha^ Linn. ; Tra- 

 gacan'thin, the same as Bassorin. 



trail'ing, prostrate but not rooting. 



trajec'tile, trajec'tilis {trajecttts, a pass- 

 ing over), when the connective com- 

 pletely separates the anther-cells. 



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