151 



Ophioglossaceae 45 

 Ophioglossum 83 

 Optical path difference 



127, 131 

 Ormolonia 84 

 Orthiopieris 84 

 Orthotricliaceae 99 

 Osmic acid 126 

 Osmiinda 84 

 Osnuiiulaceae 45 

 Osmundastrum 84 

 Oxymilra 114 

 Oxymitraceae 99 

 Paindella 112 

 Parkeriaceae 45 

 Pellaea 85 

 Pellia 115 

 Pelliaceae 99 

 Peranema 85 

 Phanerophlebia 85 

 Phanerosorus 86 

 Phascum 117 

 Phcrosphaera 3, 30 

 Phlebodium 86 

 Phyllodadiis 31 

 Phijlloglossiim 87 

 Picea 32, 33 

 Pilgerodendron 34 

 Piliilaria 87 

 Pilulariaceae 45 

 Pinaceae 5 

 Pinas 34-36 

 Plagiochasma 115 

 Plagiochila 116 

 Plagiochilaceae 99 

 Plagiogyria 88 

 Plagiogyriaceae 45 

 Plastids 130 

 Platyceriiim 88 

 Platyzoma 63 

 Pleasiuni 84 

 Pleuiophascaceae 99 

 Pleiirophascum 116 

 Podocarpaceae 5 

 Podocarpus 36, 37, 38 

 Po/j/ja 102 

 Polarization microscopy 



131 

 Polybotrya 88 

 Polypodiaceae 45 



Polytrichaceac 99 

 Polylrichiim 116 

 Po«za 117 

 Pottiaceae 99, 117 

 Protocyathcaceae 45 

 Pseudolarix 39 

 Pseudotsuga 40 

 Psilotaceae 45 

 Psilotiim 89 

 Pleridiiim 89 

 Ptcridophyta 45 

 Pteridophyta, megaspo- 



res 45 

 Pteridophyta, isospores 



and microspores 45 

 Pyrrhobryiim 117 

 Pyrrosia 89 

 Radula 118 

 Radulaceae 99 

 Replica methods 128 

 Rhacomilrium 118 

 Rhizogoniaceae 99 

 Riccardia 118 

 P/<Tja 119 

 Ricciaceae 99 

 Pz>//a 120 

 Riellaceae 99 

 Riissula 128 

 Saccale 3 

 Sacci 3 

 Saccoloma 89 

 Saccus (height, breadth, 



depth) 4 

 Salvinia 90 

 Salviniaceae 45 

 Saxegothaea 40 

 Scapania 121 

 Scapaniaceae 99 

 Schistostega 121 

 Schistostegaceae 99 

 Schizaea 78 

 Schizaeaceae 45, 78 

 Sciadopitys 41 

 Selaginella 90-94; PI. 



Ill (facing p. 94) 

 Selaginellaceae 45 

 Selenodesmium 96 

 Sequoia 41 

 Sequoiadendron 41 

 Serpyllopsis 72 



Setosisporiles 2 

 Southbya 121 

 Sphaerocarpaceae 99 

 Sphagnaceae 99 

 Sphagnum 121 

 Spiridens 122 

 Spiridentaceae 99 

 Splachnaceae 99 

 Sf)hirhruru 122 

 Staining 14(5 

 Slangeria 42 

 Stenochlaena 94 

 Sticherus 63 

 Stroemia 124 

 Stromalopteris 63 

 Symphyodon 122 

 Symphyodontaceae 99 

 Symphyogyna 123 

 Symphyogynaceae 99 

 Taiwania 42 

 Taenitis 95 

 Tapeinidium 95 

 Targionia 123 

 Targioniaceae 99 

 Taxaceae 5 

 Taxodiaceae 5 

 Taxodium 42 

 Taxus 42 

 Tayloria 122 

 Tenuitas 3 

 Thujopsis 43 

 Thyrsopteris 95 

 Timmia 124 

 Timmiaceae 99 

 Tmesipteridaceae 45 

 Tmesipteris 96 

 Tof/^a 84 

 Torrcya 43 

 Trichomanes 96 

 Tsu^a 3, 43, 44 

 f7/o/o 124 

 Vandcnboschid 96 

 Vittaria 96 

 VozV/a 122 

 Welwilscliia 4, 19 

 Welwilschiaceae 5 

 Widdringlonid 26 

 Woo^/s/rt 97 

 Xiphopteris 97 

 X-ray diffraction 131 



