Xiv TABLE OF CONTENTS. 



CHAPTER IX. 



PAGE 



ophioglossejE . . . .30/ 



Germination and development of Botrychium Unarm, Sw: Underground 

 germination of this plant, 307 ; structure of the prothallia, 307, 308 ; 

 production of antheridia and archegonia, 308 ; development of the 

 embryo 308, 309 ; Roper's notion of the growth of Botrychium, 309, 

 310 modified by Presl, Mettenius, and subsequently by Roper, 310 ; 

 Braun on the growth of Ophioglossum, 310; Schacht's assertion that 

 Botrychium is reproduced only by adventitious buds, 310 ; production 

 of fronds in Botrychium, 311, 312; Roper's observations on ramifica- 

 tions of stems of Botrychium in loose, sandy ground, 312, note; vege- 

 tation of Ophioglossum vulgatum, 312315 ; development and arrange- 

 ment of the fronds, 313, 314; form of the apical cell, 314; develop- 

 ment of vascular bundles and roots, 314, 315 ; relation of fertile and 

 sterile fronds, 31 5 ; observations of Mettenius on the germination of 

 Ophioglossum pedunculosum, 315317; its prothallia, 315, 316; pro- 

 duction of antheridia and archegonia, 316 ; development of the em- 

 bryo, 316, 317. 



CHAPTER X. 



PILULABJA GLOBULIFEB.A AND MINUTA ; MAKSILEA PTJBESCENS . 318 



Fruit of Pilularia, 318321; development of spore-mother-cells, 319; 

 formation of the macrospores, 319, 320 ; formation of the micro- 

 spores, 320; dispersion of the spores, 321 ; germination of the macro- 

 spores, 321, 322; development of the prothallium and pro-embryo, 

 and formation of the archegonia, 322 ; production of spermatozoids 

 from the microspores, 322, 323 ; development of the embryo, 323 

 325 ; structure and germination of the large spore of Marsilea pubes- 

 cens, 325, 326 ; formation of the prothallium and archegonium, 

 326, 327: failure of experiments with the small spores, 327. 



CHAPTER XI. 



SALYINIA NATANS 328 



Structure of the large ripe spores, 328 ; production of the prothallium, 

 328, 329 ; formation of the archegonia, 329, 330 ; development of 

 the microspores aud production of spermatozoids from them, 330 

 332; development of the impregnated archegonium and formation of 

 the embryo, 332 334 ; production of vascular bundles, 334 ; infertility 

 of prothallia kept from microsporangia, 334. Historical review: 

 Confusion produced in regard to the germination of Rhizocarpese by 

 Schleiden's ' Grundziige,' 335; observations of Nageli, Mettenius, 

 and Hofmeister on this subject, 335. 



