CHAPTER XXVIII. 

 THE ANDRCECIUM OF ANGIOSPEKMS. 



MATERIALS USED. 



Flower-buds of various ages, and flowers, of the Day Lily (Hemerocallis 

 fulva) ; fresh, or in alcohol. Summer. In its stead, species of Lilium, 

 Tulip, Hyacinth, Funkia ovata, Agapantlms umbellatus, Iris, etc., thus 

 providing material available during a great part of the year. 



The same of Tradescantia virginica; fresh. Or the Snowflake (Leucojum), 

 or Fritillaria imperialis (the Crown Imperial). 



Flower-buds, about to open, and older flowers of (Enothera, or Fuchsia, or 

 Epilobium ; fresh. 



Flowers of Althcea rosea, or other Malvaceae ; fresh, also in alcohol. 



Flowers of Calluna, Erica, Azalea, Rhododendron or Acacia species ; fresh. 



Flowers for pollen-cultivation ; fresh. 



REAGENTS USED. 



Concentrated sulphuric acid Chlorzinc iodine 25 per cent, chromic acid 

 Acetic iodine green Iodine Logwood Carbolic acid Chloral 

 hydrate Oil of cloves Oil of lemon Iodine green Acetic acid 

 Sugar solution with gelatine. 



THE male sexual organs of an Angiospermous flower form 

 collectively the androecium. The individual stamen consists 

 of a (usually) thread-like stalk, the filament, and the anther, 

 This last is formed of two longitudinal halves or anther-lobes, 

 which are separated by the upper part of the filament, the so- 

 called connective, but the connective is reckoned as a part of 

 the anther. In the tissue of each anther-lobe are contained 

 usually two compartments, or pollen-sacs. Each pollen-sac 

 corresponds with a microsporangium. 



Stamen of Hemerocallis. We first inform ourselves about 

 the stamen of some one of the large-flowered Liliaceae ; for 

 example, Hemerocallis fulva, a hardy herbaceous perennial, very 

 widely cultivated in gardens, or any of the still more universally - 



(380) 



