trabeculate 



Transmission 



with cross-bar markings ; trabec'u- 

 late, trabecula'tus, cross-barred ; 

 Trab'ecule, = TKABECULA. 



Tra'chea (Lat., the windpipe), a 

 spiral duct or vessel ; tra'cneal, 

 belonging to or resembling tra- 

 cheae ; <- Cells, tracheids ; ~ of the 

 vascular bundles, the woody por- 

 tion, the cribrose part associated 

 with bast ; tra'cheary, = TRACHEAL ; 

 Tra'cheid (el5os, resemblance), a 

 closed cell having secondary thick- 

 ening ; vasiform wood-cell of Good- 

 ale ; ~ Seam, a group of peculiarly 

 thickened cells found in the leaves 

 of Conifers on both sides of the 

 vascular bundle, and formerly re- 

 garded as part of the transfusion 

 tissue ; Trachench'yma (Zyxvpa, 

 an infusion), tissue composed of 

 tracheids or spiral vessels; Tra'- 

 cheome, stated by Potouie' not to 

 be the tracheal, but the hydral 

 system of the bundle, he therefore 

 names it HYDROME. 



trachycar'pous, -pus (rpaxvs, rough 

 to the touch, Kapiros, fruit), rough- 

 fruited ; trachysperm'ous, -mus 

 (<rTrep/j.a, a seed), rough-seeded. 



Tractel'lum (tractus, dragged), the 

 anterior flagellum of the zoospore 

 of Saprolegnieae (Hartog). 



Trag'acanth, a gum which flows from 

 Astragalus Tragacantha, Linn. ; 

 Tragacan'thin, the same as BAS- 

 SOKIN. 



trailing, prostrate but not rooting. 



trajec'tile, trajec'tilis (trajectus, a pass- 

 ing over), when the connective 

 completely separates the anther- 

 cells. 



Tra'ma (Lat., weft), a mass of hyphae 

 in the lamellae of some Fungi, from 

 which the hymenium springs ; 

 Fayod subdivides it thus : <~ con- 

 tex'ta, the hyphae usually parallel, 

 or slightly oblique ; ~ inver'sa, 

 when they are derived from the 

 sub-hymenium ; ~ permix'ta, when 

 without apparent order. 



transa'pical (trans, across or beyond, 

 + APICAL), used by 0. Mueller for 

 "" Ax'is, at right angles to the 



apical axis, passing through the 

 centre of the pervalvar (main 

 longitudinal) axis of a Diatom ; ~ 

 Plane, the plane at right angles 

 to both valvar and apical planes, 

 passing through the pervalvar and 

 transapical axis (0. Mueller) ; 

 Transec'tion (sectio, a cutting), a 

 term proposed by C. Macmillan 

 for "transverse section." 



Trans'fer (transfero, I bring over), of 

 water, the passage of water by 

 ducts or cells. 



Transforma'tion (transformatio, a 

 change of shape), (1) metamor- 

 phosis ; (2) morphologic changes 

 in an organ during its existence ; 

 adj. transformed' ; as ~ Branch, 

 may be a tendril, thorn, or simi- 

 larly changed organ ; ~ Cell, the 

 final shape of the cell, as a fibre, 

 tracheid, etc. 



Transfu'sion (transfusio, a pouring 

 out), transference ; Tis'sue, of 

 two kinds of cells ; (a) unpitted, 

 with abundant protoplasmic con- 

 tents ; or (6) tracheidal cells, with 

 similar contents ; ~ Strand, con- 

 sisting of parenchymatous or 

 slightly thickened cells at the 

 junction of the phloem and xylem 

 bundle elements, when a ring of 

 sclerenchyma is formed. 



Transition (transitio, a passing over) 

 Cells, cells which are continuations 

 of sieve-tubes, the longitudinal 

 division into sieve-tubes and com- 

 panion cells stops, and Transit'ion- 

 tissue is formed; transitor'ius 

 (Lat., adapted for passing through), 

 temporary, soon passing away (S. 

 F. Gray). 



Translator (Lat., a transferrer), em- 

 ployed for the RETINACULUM of 

 Asclepiads. 



Transloca'tion (trans, across, locatio, 

 a placing), the transference of 

 reserve material from one part to 

 another. 



Transmission (transmissio, a sending 

 across), used for the conveyance 

 of stimulus as in Drosera and 

 Mimosa pudica, Linn. , other leaves 



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