220 MATERIAL, APPARATUS, AND SUPPLIES 



SUGGESTIONS ON MATERIAL FOR THE STUDY OF 

 PLANT HISTOLOGY 



214. Histological material of the seed plants. 



Air passages. Kootstock of sweet flag (Acorus); stem oi Juncus, Myrio- 

 phyllum, Scirpus; leafstalks and flower stalks of pond lily and of Nuphar. 



Aleurone grains. Seeds of almond, Brazil nut, castor bean, and nutmeg. 



Bast fibers. Stem of flax, of hemp, of linden (young twig) ; leaf of Carlu- 

 dovica, esparto grass, palm, pineapple. 



Bundles, closed. Stem of asparagus, corn, green brier {Smilax) ; flower 

 stalks or leaves of Yucca filamentpsa ; petioles of fan palm leaves (cut if 

 necessary from the handle of a palm-leaf fan). 



Bundles, open. Young stems of Aristolochia, Begonia, Clematis, evening 

 primrose, Menispermum ; stems of sunflowers or other large composites. 



Cambium. See Bundles, open. 



Cambium, cork (phellogen) . Young twigs of Abutilon (greenhouse species) 

 and of elder. 



Central cylinder of root. Roots from bulb of hyacinth or onion ; roots of 

 Acorus, Actcea, Smilax, Veratrum. 



Chlorophyll bodies. Best seen in leaves of moss, as Funaria or Mnium, or 

 in fern prothallia ; thin sections of any green leaves or upper epidermis torn 

 off, with the tops of the palisade cells attached ; large and distinct in leaves 

 or bracts of pineapple. 



Chromatophores or chromoplasts. Surface sections from sepals of Tro- 

 paeolum, pulp of fruit of Gratmgus, asparagus, or rose, root of carrot ; many 

 algae, such as Spirogyra, Ulothrix, desmids, diatoms, Ectocarpus, Nema- 

 lion, etc. 



CoUenchyma. Young stems of Aristolochia Sipho; stems of begonias, 

 Salvia, and most Umbelliferx. 



Cork. Young twigs of Ailanthus, sweet gum (Liquidambar), cherry, 

 currant, Cytisus Laburnum, Euonymus cUatus; ordinary bottle corks (from 

 Quercus Suber) ; cortex of potato tuber. 



Cuticle. Leaves of Agave, Aloe, Cyeas revoluta, Ficus elastica. Yucca fila- 

 mentosa. 



Embryo sac. Lily, buttercup, and. their allies. 



Epidermis. See under Cuticle. Also thin and easily peeled epidermis of 

 iris, lily, hyacinth. 



Fertilization and development of embryo. Young fruit of Capsella, Mono- 

 tropa, Pyrola, Veronica, lily, buttercup. 



Growing point. Tip of stem of Myriophyllum or Sippuris ; buds of lilac, 

 Cratmgus, Viburnum. 



