ILLUSTRATIONS. 



FROM ORIGINAL DRAWINGS BY B. HEYN, E. v. RANSONNET, J. SEELOS, F. TEUCHMANN, 



0. WINKLER, AND OTHERS. 



Ferns and their spore-cases, &C M 



Horse-tails (Equiseta), 



Mosses and their fructification, - 



Swarm-spores of Saprolegniacese and Chytri- 

 diacese, 



Moulds and their fructification, - 



Discomycetes (Morel and other Fungi), 



Basidiomycetes (various Fungi), 



Thallidia of Muscinese or Mosses, 



Formation of Thallidia in the cells of Hydro- 

 dictyon and in those of Pediastrum, 



Helwingia rusciflora, with flowers seated upon the 

 foliage-leaves, 



Formation of Buds on the apices of the Fronds of 

 Ferns: Asplenium JSdgeworthii, 



Formation of Buds on Fronds and Foliage-leaves, 



Fertilization and fruit-formation in Ulothrix 

 zonata (partly after Dodel-Port), 



Fucus vesicidosus (Bladder-wrack), various sec- 

 tions, 



Fucus vesicidosus, do. do., 



Fertilization and fruit- formation in Mucorini, 

 Siphonaccce, and Floridece, - 



Fertilization, fruit-formation, and spore-formation 

 in the Peronosporese, 



Fruit-formation in Stoneworts (Characese), 



Structure of Phanerogamic Ovaries : various ex- 

 amples in section and otherwise, - 



Structure of Phanerogamic Ovaries : various ex- 

 amples in section and otherwise, - 



Structure of Phanerogamic Ovaries : various ex- 

 amples in section and otherwise, - 



Structure of Phanerogamic Ovaries : various ex- 

 amples in section and otherwise, 



Antholysis and Structure of the Ovary, 



Ovules and Foliaceous Carpels, - 



Stamens of double and monstrous flowers, - 



Stamens, numerous examples, 



Curved anthers in the flower of Phyllanthus Cy- 

 clanthera (after Baillon), - 



Stamens, numerous examples, - 



Pollen-grains, fourteen varieties, 



Pollen-grains, nine varieties, - 



Pollen-grains and pollen-tetrads united by threads 



of viscin, 



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101 



Protection of Pollen from Wet in Sea-buckthorn, 



&c., 109 



Protection of Pollen from Wet in Globe-flower, 



Digitalis, &c., - - - - - 110 



Protection of Pollen from Rain,- - - - 112 

 Protection of Pollen in Crocus multiftdus, - - 113 

 Protection of Pollen in Carlina acaulis, - - 117 

 Protection of Pollen in Herb-Robert, Bell-flower, 



Scabious, 121 



Protection of Pollen in various plants, - - 125 

 Flowers of Vallisneria spiralis floating on the 



surface of water. 132 



The common Alder (Alnus glutinosa) and its 



flowers, 135 



The Paper Mulberry-tree (Broussonetia papyri- 



fera), 137 



The Ash (Fraxinus excelsior) and its flowers, - 138 



Flowers of Avena elatior, 139 



The Elm ( Ulmus campestris) with its flowers and 



seed vessels, 143 



Flowers, &c., of Mountain Pine (Pinus Pumilio), 144 

 Male Flowers of Yew (Taxus baccata), - 145 

 Hazel (Corylus Avellana) with flowers and fruits, 147 

 Curled Pondweed (Potamogeton crispus) in the act 



of pollination, 148 



Flowers of Arrow-grass (Triglochin palustre), 149 

 The Nottingham Catchfly (Silene nutans) in the 



daytime, 154 



The Nottingham Catchfly (Silene nutans) by night; 



a flower being visited by a moth, - - 155 

 Transport of Pollen by Egg-laying Insects, - 157 

 A rum conocephaloides, with the front wall of the 



spathe removed, 164 



Flower of Birthwort (Aristolochia ringens), 166 

 Honeyless Flower of Argemone Mexicana with 



abundant pollen, 168 



Flowers of the Snowflake (Leucojum vernum), 170 

 Honey-secreting tissue in flowers, ... 173 

 Nectaries in several flowers, - - - - 174 

 Flower of the Snowdrop (GalantJius nivalis), - 176 

 Flower of Narcissus (Narcissus Pseudonarcis- 



sus), 177 



Flower of the Wild Valerian ( Valeriana officinalis), 



cut through longitudinally, - - - -178 

 Concealment of Honey in Flowers, - - - 180 



