thermogenic 



Tuberidiam 



the case of certain bacteria ; 

 thermotac'tic {TaxriKos, apt for 

 tactics), heat perceptive as shown 

 by growth. 



thinic'olous {colo, I dwell), dwelling 

 on shifting sand dunes (Warm- 

 ing). 



Thiobacter'ia {dilov, sulphur, + Bac- 

 teria), sulphur- oxidizing bacteria ; 

 thiogen'ic {ydvos, offspring), sul- 

 phur-producing ; thiorhoda'ceous, 

 belonging to Thiorhodaceae, a 

 family of bacteria ; thiox'idans, 

 bacteria oxydizing sulphur com- 

 pounds to sulphates. 



Thlaspie'tum, an association of 

 Thlaspi Dill. 



Thread, the longitudinal half of an 

 entire univalent spireme or chromo- 

 some (Digby) ; Thread-ring, 

 spireme halves in karyokinesis 

 (Balls). 



Thyme'tum, an association of Thymus 

 Linn. 



Tier, a stage or layer. 



tiled [monosyll.], Withering's term 

 for imbricate overlapping. 



Till, the product of glaciation, 

 ground moraine ; Till'ite, the same 

 when fossil (Clements). 



tiphie'olous {colo, I dwell), pond- 

 dwelling. 



Tjemo'ro, an aphyllous forest, formed 

 chiefly of Casvarina Linn., in Java 

 (Warming). 



Tolypotriche'tum, an association of 

 Tohjpothrix Kiitz. 



Trabec'ulae of Sanio, cf. Sanio. 



Trans'ect, it may be Belt ~ ; 

 (denu'ded or per'manent) Lay'er ~, 

 or Li'ne ~ (Clements). 



Transil'ients {transilio, I leap across), 

 Galton's term for Mutations (I). 



Tre'malith {rpijixa, a hole), having a 

 hole through the structure (Loh- 

 mann). 



Tri'chome Hy'dathodes (+ Hyda- 

 thode), hair-like organs secreting 

 moisture in Agaricineae (Knoll). 



Trichophore'tum, au association of 

 Trichopkorus Desv. 



trichromoso'mal, concerned with three 

 chromosomes (Frost). 



Tricot'yl (-f cotyledon), cf. Trico- 

 tyledony; adj. tricot'ylous ; Tri- 

 gen'er {genus, kind), the product from 

 three genera (Hurst) ; Trihy'brid, 

 Church's term for a hypothetical 

 working of three factors at once ; 

 Trihy'bridism is the condition; 

 trim'erous, add, (2) seedlings with 

 three cotyledons, and as many 

 primordial leaves; Trim'ery, the 

 possession of trimerous members 

 (Salisbury); trimo'dal, three forms 

 or modes ; Trimodal'ity is the state 

 (Engledow); trimonoe'cious, cf. 

 Trimonoecism ; trip'lex, three 

 dominant factors (Blakeslee) ; 

 trip'loid, add, used loosely for 

 hybrids between forms one of 

 which has twice as many chromo- 

 somes as the other ; Triploi'dy, the 

 state in question; triplost'ichous 

 {oTL^os, a row), three rows of cortical 

 cells to each branchlet or bract-cell 

 in Charads; triso'me, triso'mio 

 {aujfjLa, a body), triploid (Blakeslee) ; 

 tristerigmat'ic, having three sterig- 

 mata to each basidium (Buller); 

 Trisyncot'yls, having three cotyle- 

 dons fused for half their length 

 (Bexon) ; trizy'gous {S^os, a 

 yoke), dependent on three pairs 

 of chromosomes. 



Tritice'tum, an association of Triticum 

 junceum Linn., and other con- 

 generic species. 



triv'alent {valens, power), having 

 apparently three chromosomes in 

 each single one, in nuclear reduc- 

 tions. 



Trophochro'matin (+ Chromatin), 

 vegetative chromidia (Minchin) ; 

 Troph'ocyte {kvtos, a hollow vessel), 

 a zygote, or fusion cell (Phillips) ; 

 Trophone'ma {vrjfjia, a thread), a 

 synonym of Plasmonema, as con- 

 veying nutriment (Janet). 



Tu'ba or Tube, add, (3) = Style, used 

 by Vaillant, and Haller ; Tube- 

 nu'cleus, named by Church as 

 delimited from the male prothallus 

 of Pinus Linn. 



Tu'bercle, add, (5) the bulbil of 

 CharadJs; Tuberid'ium, pi. -ia, the 



471 



