It+ 



LIST OF ILLUSIRATIOXS. 



SELAGINELLA CINERASCENS • f.t.ingix' 



OREGON SELAGINELLA. Sciagine^/.t Ort,;.,u,i . . facing mJ 



PSIGKLY MOUNTAIN MOSS. •'>c/„ginclla s/iiiw.a facing 150 



CREEPING SELAGINELLA. Setaginclla afus i=fi 



SPIKE OF CREEPING SELAGINELLA 157 



SELAGINELLA LUDOVICIANA facing i;8 



SELAGINELLA LUDOVICIANA. (In colours) facing 160 



SELAGINELLA DOUGLASIl ■ 160 



RESURRECTION MOSS. Selciginclla !cf!,l,';-l,yua facing 162 



BRANCH OF THE RESURRECTION MOSS . 162 



RESURRECTION MOSS, WHEN DRY /. 



SPOROCARPS OF AZOLLA 



SALVINIA NATANS 



CROSS-SECTION OF SALVINIA SPOROCARPS 



SPOROCARPS OF SALVINIA NATANS 



WATER FERN. Azolla Carotiitiana 



THE HOME OF AZOLLA . ■ . f 



AZOLLA FILICULOIDES 



SPOROCARP AND SPORANGIA OF MARSILIA 



VEINING IN THE LEAF OF MARSILIA 



SPOROCARP OF MARSILIA 



CROSS-SECTION OF PILULARIA SPOROCARP 



MARSILIA QUADRIFOLIA. (In colours) 



MARSILIA QUADRIFOLIA ■ 



MARSILIA UNCINATA 



MARSILIA VESTITA 



MARSILIA MACROPODA 



PILULARIA AMERICANA 



LEAF OF ISOETES SHOWING SPORANGIUM 



CROSS-SECTION OF ISOETES LEAF 



MEGASPORES OF ISOETES 



MICROSPORES OF ISOETES 



BRAUN'S QUILLWORT. Isoctcs echincspora Braiinii 



MEGASPORE OF ERAUN-S QUILLWORT 



MEGASPORE OF ISOETES ECHINOSPORA MURICATA 221 



MEGASPORE OF ISOETES TRUNCATA 222 



MEGASPORE OF ISOETES ECHINOSPORA FLETTII , 222 



MEGASPORE OF ISOETES LACUSTRIS 224 



MEGASPORE OF TUCKERMAN'S QUILLWORT. Isoctcs ruckermani 225 



MEGASPORE OF BOLANDER'S QUILLWORT. IsoUcs Bclandcri 2j3 



MEGASPORE OF ISOETES HIEROGLYPHICA 229 



MEGASPORE OF ISOETES MACOUNI • • 229 



ENGELMANN'S QUILLWORT. Isoctcs Engchnanni ftcijig 2 i^ 



MEGASPORE OF ENGELMANN'S QUILLWORT 234 



MEGASPORE OF ISOETES ENGELMANNI CAROLINIANA 235 



MEGASPORE OF EATON'S QUILLWORT. Isoctcs -caliiia 236 



MEGASPORE OF DODGE'S QUILLWORT. Isoctcs Cai:aa\i:>;- 238 



MEGASPORE OF RIVER-BANK QUILLWORT. Isoctcs ri/at ia 239 



MEGASPORE OF ISOETES SACCHARATA 24c 



