﻿INDEX. 



293 



Cycas rcvoluta — Continued. 



Tracheitis of, 198 

 Cycas Riuminiana, *S0 



Seed-bundle system of, *2\g, 220 

 Cycas Rumphii, *203 

 Cycas Seemanni, 209 



Young leaves of, *2io 

 Cycas siamcnsis (?), *205 

 Cycas Steenstrupi, 191, 217 

 Dakota sandstone, 95 

 Dammara, 212 



DaiKca, locular septation in synangia of, 159 

 Danaa elliptica, synangium of, *2I5 

 Distribution — 



Of existing cycads, 189-191, 192 



Of fossil cycads, 5-20, 81, 167, 191, 192 

 Dictyozamites, nervation of, 213, 239 

 Dictyozamitcs indicus, frond of, *234 

 Dion, 33, 86, 87, 90, 189, 201, 212, 239 



Microsporopliylls of, 215 



Monoxylic vascular zone of, 197 



Old peduncle bundles in pith of, 196 



Pinnule growth in, 209 



Prefoliation of, 210 

 Dion cdulc, *84, *i88 



Cortical bundles of, 202 



Megasporophyll of, *2I7 



Phyllotaxy of cones, 215 



Ramentum, *5I, 53 



Root of, 207, *2o8 

 Dion spinulosum, fronds of, *2ii 

 Diplodocus, 100 

 Embryos of — 



Bennettitcs Cibsonianus, 107, 124 



Cycadacea, 226 



Cycadeoidea Wiclandi, 124 

 Encephalartos, 92, 93, 124, 189, 197, 199, 205, 206, 

 209, 210 



Carpellary leaf reversion in cone of, 214 



Leaf-base bundles, 60, 62 



Megaspore bundle of, *22i, 232, 233 



Ramentum, 54 



Seed-bundle system of, 220 

 Encephalartos Altensteinnii, *igy 



Branching of, 38 

 Encephalartos caffcr, 212 



Phyllotaxy of cones, 215 

 Encephalartos cycadifolius, *62, 93 

 Ghellinckii, *207 

 Gorceixianus, 190 

 Hildebrandtii, *29 

 Encephalartos horridus, fronds of, *2ii 



Megaspore bundle supply of, 222 

 Encephalartos ( ?) lanuginosus, pinnules of. *2I2 

 Encephalartos Lehmanni, pinnules of, *2I2 

 Encephalartos villosus, *29, *5I 



Fronds of. *2ii 



Monstrous cone of. *23i 

 Encephalartos "Vroomi" *62 

 England, cycads of, 14 

 Eolirion, 81 



European cycad localities of minor note, 16 

 European cycads, discovery of principal types. 

 12-16, 18, 19, 107 



Fertilization, 216 

 Fossil cycad localities (sec European cycads, 



Wyoming, Black Hills, etc.) 

 Fossil cycadean trunks : 



Occurrence in time in Old World, 18-20 



Occurrence in time in North America, 11 



Old World types, list of, 18-20 



Popular names of, 6 



Rarity of, 5 

 France, cycad types from, 13 

 Freezout Hills, Carbon County, Wyoming, 23, 



100, 102 

 Galicia, cycad from, 13 

 Ginkgo, 125, 137, 230, 240 



Fertilization in, 216 



Megasporophyll homologies of, 232 



Protocorm of, 226 



Spermatozoids of, 216, 239 



Stamens of, 245 

 Ginkgo biloba, 137 



Embryos of, 124 



Pollen of, 161 



Protocorm of. 125, 126 

 Ginkgoacca-, strobilar homologies of, 235 

 Ginkgoalcs, 244 

 Gn dales, 123 



Gondwana system, cycads from, 16 

 Growth accommodation in cycad stem, 200, 203 

 Hawkser and Runswick, discovery of cycads in 



cliffs of, 15 

 India, cycads of, 16 

 Interseminal scales, 231 



Description of, 116-118 



Figured, *u6, *ng 

 Inyan Kara Mountain, Wyoming, cycads found 



near, 8 

 "Iron Ore Belt" (see Maryland) 

 Isle of Portland cycads, 6, 16 

 Isle of Wight, cycads from, 16, 107 

 Italy, cycads of, 12 



Johns Hopkins University, fossil cycads in, 4, 5 

 Kaulfussia asculifolia, synangium of, *2I5 

 Lagenostoma, 216, 219, 220, 246 



Megaspore membrane of, 123 



Seed-bundle system of, 222 



Seed of, 124, 234, 246 

 Lagenostoma Lomaxi, 246 

 Leaf bases of Cycadeoidea, 56-66 



Bundle grouping, 59, 60 



Bundle structure of, 64-66 



Variation in spirals, 56, 57, 58, 59, 60 

 Liriodendron, 120, 143, 244, 245 

 Lyginodendron, 217, 219, 225, 237, 245 

 Lyginodendron Oldhamium, 65 



Discovery of mega- and microspores of, 246 

 Macrozamia, 79, 86, 87, 91, 96, 189, 197, 198, 205. 

 207, 210, 226, 227 



Polyxylic vascular zone of, *I99, 200. 



Ramentum, 54 



Seed-bundle system of, 220 

 Macrozamia cylindracea, 80 

 Macrozamia Fraseri, *I99 



Inverted bundles of vascular zone, 200 



Irregular periderm excision in, 206 



