﻿G. 
  R. 
  Wieland 
  on 
  the 
  Cycadopliyta. 
  

  

  395 
  

  

  known 
  or 
  inferred. 
  Obviously 
  such 
  a 
  classification 
  

   essays 
  first 
  the 
  orderly 
  presentation 
  of 
  facts; 
  but 
  yet 
  it 
  

   can 
  only 
  be 
  usable 
  as 
  discovery 
  progresses, 
  if 
  it 
  has 
  both 
  

   flexibility 
  and 
  impermanence. 
  Nor 
  are 
  the 
  uncertain 
  

   boundaries 
  an 
  objection. 
  Indeed 
  one 
  chief 
  function 
  is 
  to 
  

   present 
  inferences 
  from 
  the 
  known 
  facts. 
  

  

  CYCADOPHYTA 
  

  

  (A) 
  

  

  Zamia 
  

  

  

  Microcycas 
  

  

  

  Ceratozamia 
  

  

  Zamiae 
  

  

  Dioon. 
  

  

  (B) 
  

  

  Encephalartos 
  

  

  Cycadaceae 
  

  

  Stangeria 
  

   Maerozamia 
  

  

  

  Bowenia 
  

  

  Cycadege 
  

  

  Cycas 
  

  

  Cyca 
  dales 
  

  

  

  (Cycads) 
  

  

  

  

  Pseudoeycas 
  

  

  Pseudocyeadeae 
  

  

  Cycadites 
  

  

  

  Stangerites 
  

  

  (incertae 
  sedis) 
  

  

  

  

  Podozamites 
  

  

  Podozamiteae 
  

  

  Plagiozamites 
  

  

  

  Sphenozamites 
  

  

  Cvcadeoidea? 
  

  

  Cycadeoidea 
  

  

  (The 
  Petrified 
  

  

  Fittonia, 
  etc. 
  

  

  series) 
  

  

  Amphibennettites, 
  

  

  

  etc. 
  

  

  Pericycadeoidaceae 
  

  

  

  (Pericycadeoids) 
  

  

  Williamsonia 
  

  

  

  Bucklandia 
  

  

  

  Zamites 
  

  

  Williamsoniae 
  

  

  Ptilophyllum 
  

  

  (The 
  William- 
  

  

  Otozamites 
  

  

  sonian 
  tribe) 
  

  

  Pterophyllum 
  

  

  

  Glossozamites 
  

  

  Hemicycadales 
  

  

  Dictyozamites 
  

  

  (Cycadeoids) 
  

  

  Cyca 
  dolepis 
  

  

  Microflora 
  

  

  Wielandiella 
  

   Williamsoniella 
  

  

  Apocycadeoidaceae 
  

  

  

  (Apoeycadeoids) 
  

  

  Anomozamites 
  

  

  

  Nilssonia 
  

  

  

  Tseniopteris 
  

  

  Holophyta? 
  

  

  C 
  tenia 
  

  

  

  Pseudoctenis 
  

  

  

  Ptilozamites 
  

  

  

  Macrotaeniopteris 
  

  

  Primitive 
  and 
  Hypothetic 
  Groups: 
  

   Cycadofilicales, 
  Medulloseae 
  or 
  

   Para 
  cyca 
  dales, 
  Proangiosperms, 
  

   Hemiangiosperms. 
  

  

  (Wieland, 
  1918 
  Eevision) 
  

  

  