286 GLOSSAEY AND INDEX. 



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oosphere of flowering plants and the highest cryptogams ; in zygomy- 

 cetous fungi the supporting cell next beneath the copulating cell. 



swarm-spore, a motile spore consisting of a naked protoplasmic body pro- 

 vided with one or more cilia, 105. 



symbiosis, a living together in a condition of mutual dependence or help- 

 fulness, 118. 



symmetrical, having a like number of parts in each whorl. 



sympodial, see monopodial. 



syngenesious, united by the anthers into a ring or tube, 217, 257. 



tap-root, the primary root produced by the development of the radicle, 20. 



teleutospore, the thick-walled resting-spore of the Uredinese, 96, 112. 



tendrU, 66, 73. 



testa, the hard outer coat of a seed, 2. 



tetradynamous, having four long and two short stamens. 



tballus (pi. thalli), the vegetative body of the simpler cryptogamous 



plants in which there is no proper difierentiation of stem and 



leaf, 

 tracheid (pi. tracheids or tracheides), one of the thick-walled elements, 



intermediate in structure between vessels and fibers, of which the 



wood of gymnosperms is composed; similar elements of the wood 



of various other plants, 55. 

 transpiration, 64, 71. 

 trimorphic, having three different forms of flowers, differing in the length 



of stamens and pistils, 86. 

 tripalmate, thrice palmately compound, 58. 

 trlpinnate, thrice pinnately compound, 58. 

 tuber, a much thickened portion of an underground stem in which the 



vascular system has been reduced and the parenchyma enormously 



increased for the purpose of storing starch and other plant foods. 



Tubers regularly consist of several internodes and bear scale-like 



leaves, with buds (eyes) in their axils. 

 typical flower, 80. 



umbel, the indeterminate umbrella-like inflorescence of the Umbelliferse 



and some other plants. 

 uredospore, one of the summer spores, or "rust" spores of the Uredinese, 



96, 112. 



vein, one of the branches of the framework or fibro-vaacular system of a 



leaf, 

 venation, arrangement of the veins of a leaf. 



