GLOSSARY 329 



Tertiary ribs, the small ribs coming off from the secondaries in the 



venation, p. 53. 

 Tissue, any aggregate of cells or vessels, &c, which follow common laws 



of growth and development, p. 69. 

 Tomentose, woolly with long soft matted hairs, p. 37. 

 Transpiration, the giving off of water-vapour from the surface of a leaf, 



p. 122. 

 Tri-foliolate, compound leaf with three leaflets, p. 44. 

 Trigonal, triangular in section. 



Tripartite, deeply divided iuto three lobes or segments, p. 40. 

 Triquetal, see Trigonal. 



Tristichous, in three vertical ranks or orthosticbies, p. 5. 

 Truncate, sharply cut off at the apex. 

 Tuber, a short, thickened, underground reservoir of reserve-materials, 



e.g. Potato or Dahlia tuber, p. 66. 

 Tuberculate, in the form of little swellings. 



Turgid, tense and swollen under the pressure of the cell-sap, p. 87. 

 Typical, fairly representative of the kind of thing referred to, p. 3. 

 Uni-foliolate, a compound leaf which has but one leaflet, p. 44. 

 Vacuole, a cavity in the protoplasm full of sap, p. 75. 

 Variegated, irregularly marked with patches of different colour, p. 37. 

 Varnished, the cuticle covered with a glistening film, p. 36. 

 Vascular bundles, the strands of special tissues, vessels, &c, which 



conduct water and other liquids, p. 83. 

 Vascular system, the system of strands composed of vessels, &c. , in the 



venation of the leaf, and in the wood and bast of the shoot and 



root, p. 83. 

 Vein, one of the smaller strands of vascular tissue in a leaf, p. 32. 

 Venation, the branched system of strands of vascular bundles in the leaf, 



p. 32. 

 Verticillate, whorled, p. 7. 

 Vessels, tubes formed by the junction of superposed rows of cells, the 



contents of which may vary considerably, p. 78. 

 Villous, velvety to nearly shaggy, with erect soft hairs. 

 Water-pore, a large stoma which exudes water under pressure, p. 105. 

 Water-stoma, a water-pore, p. 105. 

 Whorled, leaves or other organs inserted at the same level round the 



axis, p. 7. 

 Winged, with a membranous margin, p. 18. 

 Zoospore, a motile spore or cell of one of the lower Cryptogams (Algae, 



Fungi, &c), living in water, p. 77. 



