154 



INDEX 



Stomate (see Stoma) 

 Stone cells, structure and occur- 

 rence of, 68, 70 

 Suherin, in walls of cork cells, 107 

 Subsidiaiy cells, of hairs, 53 



of stoma, 48 

 Sudan IV, use for e]»id('rinis, 4!) 



use of, 142 

 Suuaner tracheids, of 7^';;»n, 88 



wood, of annual ring-, 115 

 Sycamore, dendroid hairs of, 54 



vestigial pit-pairs in, 15 

 Si/ringa, guard cells of leaf, 4!) 



study of leaf of, 124-127 



TECOMA raflicans, simple pit- 

 pairs of, 12 

 Textile ])lants, fibers of, 73 

 Tilia, bast fibers of, 77-78, 113 

 cell walls in pith and cortex, 11 

 study of stem of, 111-117 

 walls of bast fibers in, 11 

 Tissue, various definitions of, 32- 



33 

 Tissues, complex, 38 



difficulty of classifying, 32, 3!) 

 Eames and MacDaniel's classifi- 

 cation, 37-38 

 Haberlandt's classification, 35- 

 37 

 T.undcgardh's classification, 30 

 permanent, 32 

 primary, 37, 86-87 

 Sach's classification, 33-35 

 secondary, 38, 86-87 

 simjile, 38 



systems of classification, '.V.]-[V.) 

 Tobacco, multinncleate fil)ers of, 



76 

 Tomato, coliencliyma of, 63 

 Torus, in bordered pit-pairs, 13 

 Tracheae, ontogeny of fibrous 



thickenings of, 84-8() 

 Traclx'ary elements, ontogeny of, 

 83-86 



Tracheary elements, structure and 

 morphology of, 80-83 

 study of in paper, 90 

 use of term, 80 

 Tracheid, bordered pits of, 13, 82, 

 88-89 

 disti'ibution of, 81 

 fil)r()us tliickenings in, 81, 84-86 

 general characters of, 80-81 

 imperforate character of, 81 

 in secondary xylem of oak, 89- 



90 

 in secondary xylem of l'i)ius, 



88-89 

 phylogenetic nature of, 81 

 study of, 88-89 

 types of ])itting in, 82 

 Tradescantia, raphides in, 5 

 staminal hairs of, 2 

 structure of shoot apex, 24-25 

 Ti'ansfusion tissue, in leaf of 



Pinns, 128 

 Ti'ans-loeation. in vnsculnr system, 

 80 

 mechanism of in phloem, 94-95 

 Trichomes, material for study of, 

 53-54 

 origin of, 51 

 types of, 52-53 

 use of term, 51 

 Trichosantlies, ontogeny of tra- 

 cheae in, 85 

 Tn'foJiiim, primary xylem of. 86, 

 87, 88 

 vascular bnndle of. 87 

 Triticum, origin of leaf in. 21 

 Ti'um])et-creeper, simple pit-pairs 



of, 12 

 Tnlip-tree, vessel elements of, 8!) 

 Tunica, method of growth. 23 

 role in leaf and bud initiation, 



23-24 

 role in tissue differentiation, 23- 



24 

 variation in nnm})er of layers 

 of, 23-24 



