INDEX 



251 



Halle, 198 



Hemlock family, 45 



Heterospory, 123, 165, 173 



Hirase, S., 70 



Hofmeister, W., 16, 75, 123 



Homospory, 123 



Horse-tail, 136, 138 



cone, 196 



Field, 193 



Great, 193 



Smooth, 194 



sporangia, 196 

 Horsetails, 34, 156, 221 



evolution of, 192-211 



fossil, 197-211 



Mesozoic, 198-199 



Palaeozoic, 199-211 



synangia, *150, 152 

 Kauri Pine, 129 

 Kew, 59 

 Kidston, R., 110, 112 



and Gwynne-Vaughan, 141 

 Knot-grass, 45 



Laminaria, 180 

 Leaves: 



Calamite, 204 



Cordaites, *128 



Cycads, 60-62 



Cycas, 61, 62 



DolerophyUum, 119 



Equisetum, 194 



Isoetes, 167 



Lepidodendrese, 177, 178, 

 180 



