172 



INDEX AND GLOSSARY 



stamen, that part of the flower 

 which bears the pollen-sacs, 

 usually four in number, 53, 70 



Staminate disc of Cycadeoidea, 

 (Fig. 13) 65 



Sterilisation, theory of, 58, 63 



Stigma, the receptive surface for 

 the pollen, (Fig. 15) 73 



Stock, or rhizome, an under- 

 ground stem, 30 



Storage of material, 34, 50 



Struvea, a genus of green Algae, 15 



Style, the part of the pistil below 

 the stigma, which is often elon- 

 gated, (Fig. 15) 73 



Sweet rush (Acorus), 90 



Swimming-free stage, 25, 28, 156 



Talipot Palm (Corypha), 110 



Tangles, brown Algae, 16 



Teesdalia, a genus of Cruciferae, 

 140 



Terminology, 6 



Tobacco (Nicotiana), 106 



Transition from aquatic to terres- 

 trial, 77, 156 



Treub, M., 113 



Ulva lactuca, sea lettuce, (Fig. 1) 



17 

 Ulva latissima, 16, 156 

 Ulothrix, a tilamentous green 



Alga, 18, 156 

 Ulothrix zonata, (Fig. 2) 21, (Fig. 



3) 28 



Vacuole, pulsating, (Fig. 2) 21 

 Variations, fluctuating, 119 

 Vegetation of the earth, 27 ; ori- 

 gin of, 155 

 Vegetative cell, (Fig. 14) 71 

 Vetch {Vicia), 140 



Volvo.v, a free-swimming green or- 

 ganism of freshwater, 157 



Water, distribution of germs by, 

 98, 113 ; medium of fertilisa- 

 tion, 79 



Water- problem, or water-relation, 

 45, 155, 163 



White dunes, those in which the 

 vegetation does not cover the 

 surface, and the sand gives 

 the prevalent colour, 130, 138, 

 140, 147 



Whitlow-grass {Erophila verna), 

 140 



Wieland, G. K., 65 



Wild Cabbage {Brassica olera- 

 ceae), 122 



Wind, distribution by, 98, 113 ; 

 ripples on sand produced by, 125 



Wolff, 54 



Wood soriel {Oxalis acetosella), 89 



Xerophytic specialisation, the 

 special structural development 

 of plants so as to fit them for 

 resisting extremes of drought 

 and heat, 134, 137, 142 



Zamia Jioridana, one of the Cy- 



cadaceae, 77 

 Zonation of seaweeds, 15, 16 ; 



of vegetation of the shore, 81 

 Zooid, an independently motile 



primordial cell, 20 

 Zoospores, motile propagative 



cells consisting of naked pro- 

 toplasm, 20, 21, 23 

 Zygospore, the result of fusion of 



two equal gametes, 23 

 Zygote, the result of fusion of two 



gametes, 22, 23, 74 



CAMBRIDGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS. 



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