466 APPENDIX II. 



Fucus platycarpus and F. vesiculosus. For reproduction, 298. Preferably 



fresh. 



'V unaria hygrometrica. Chlorophyll-bodies, 52. Leafy stems. Fresh. All 

 " : the year round. 



Sexual organs, 347. Male and female plants. Fresh, or in 



alcohol. Plants with the sexual organs and the sporogonia in all 



stages of development can be found nearly all the year round. 

 Funkia ovata. Development of pollen, 385. Flower-buds of different 



ages. May. Fresh, or in alcohol. (Substitute for Hemerocallis, q.v.) 



Gall, Oak. Structure and tannin reaction, 70. Fresh, or dried. 



Ginkgo biloba. For autumn tints. Fresh leaves, 58. 



Glceocapsa caldariorum, 263 (or G. polydermatica). Fresh. On walls, flower- 

 pots, glass, etc., in greenhouses and fern-houses. All the year. 



Gloxinia hybrida. Pollen-cultures, 392. Embryo-sac, 405. Flowers. 

 Fresh. 



Gymnocladus canadensis. Leaf-fall, 203. Leafy twigs. A very ornamental 

 hardy deciduous tree. Prefers shaded position. (Used as substitute 

 for ^Esculus, q.v.} 



Gymnogramme. For culture of fern-spores, 363. 



H. 



Hart's-tongue fern. See Scolopendrium. 



Hedera Helix (Ivy). Resin canals, 152. Young twigs. Fresh, or in 



alcohol. 

 Helianthus annuus (Sunflower), and H. tuberosus (Jerusalem artichoke). 



For vascular bundles. (Substitute for Aristolochia, q.v.) 

 Hellebore. See Helleborus. 

 Helleborus fcetidus (Stinking Hellebore). Cell and nuclear division and 



pollen-formation, 443. Flower-buds of various ages. Fresh, or in 



alcohol. 



' V Structure of ovary, 395. Flowers. February and March. 

 :il niger (Christmas Rose). Structure of ovary, 395. Flowers. 



January, February. 



(These two substitutes for ovary of Delphinium, q.v.) 

 Hemerocallis fulva. Development of anther and pollen, 380. Flower-buds 



of different ages. Fresh, and in alcohol. Summer. A hardy 



herbaceous perennial. (As substitutes, Liliwn, Funkia, Agapanthus 

 '''''' : umbellatus, Tulipa, Hyacinthus.) Also for pistil, 396. 

 L ibiscus. For cork, 182. Stems. Greenhouse perennial. 

 Hippuris vnlgaris (Mare : s-tail). Structure of growing apex, 204. Growing 



buds. Fresh, or in alcohol. Late spring or early summer. A 



native perennial herbaceous marsh or aquatic plant. 

 Hollyhock. See Althaea rosea. ,' . 



