INDEX. 



503 



Polytrkhum formosum, spermatozoids 



of, 154. 

 Polytrichum juniperinum, antheridia 



of, 153. 

 " Precursors" of the vascular bundles, 



in Isoetes lacustris, 352. 

 Preissia commutata, Gottsche on, 



127; Schmidel on, 123. 

 Presl, on the stems and fronds of Bo- 



trychium, 310, 311. 

 Pringsheim, on the sterns of ferns, 264. 

 Pro-embryo, of Abietinese, 427 ; of Co- 

 niferse, described by Schleiden, 432 ; 

 Mirbel and Spach, 433; develop- 

 ment of Juniperus communis, J. Sa- 

 bina, and Thuja orientalis, 431 ; of 

 mosses, 171, 435 ; differences of, 

 from prothallium of ferns, 174; of 

 Liverworts, 435 ; of Pilularia glo- 

 bulifera, 322 ; of Sphagnum, Schim- 

 per on, 174 ; of Taxus, 430. 

 Prothallium, of Botrychium Lunaria, 

 307 ; of Equisetacese, develop- 

 ment of, 292 ; male, production of, 

 in Equisetum arvense, and E. pra- 

 tense, 297 ; female, production of, 

 in Equisetum palust re, 298 ; of ferns, 

 183 ; analogous to leafy plant of 

 mosses, 435 ; observed by Ehrhart, 

 257 ; sexual organs observed in, by 

 Bischoff, 257 ; adventitious shoots 

 of, 197 ; abortive, continued growth 

 of, 196 ; of Isoetes lacustris, 339 ; 

 of leafy Jungermannise, 84 ; of Mar- 

 silea puhescens, formation and struc- 

 ture of, 326 ; of Ophioglossum, 

 Mettenius on, 315 ; of Pilularia 

 globulifera, and P. minuta, forma- 

 tion of, 322 ; of Salvinia nutans, 

 production of, 329 ; of Selaginella, 

 production of, 392. 

 Prothallus, universality of, in plants, 



126. 

 Psilotum triquetrum, growth of stem 



in, 398. 

 Pteris aquilina, antheridia of, 187; 

 archegonia of, 191 ; development 

 of buds in, 225 ; development 

 of embryo of, 200 ; first frond of, 

 208 ; arrangement of fronds in, 

 212 ; production of new fronds in, 

 221 ; production of fronds in old 

 plants of, 224; germination of, 183; 

 growth of stem- bud in, 211 ; creep- 

 ing stem of, 212 ; structure of stem 

 of, 213. 



Pteris serrulala, antheridia of, 187. 

 Ptilidium ciliare, development of 

 leaves in, 60 ; ramification of, 64. 



Racomilrium ericoides, pro-embryo of, 



171 ; terminal bud of, 129. 

 Radula complanata, antheridia of, 65, 

 73; archegonium of, 67; calyptra 

 of, 79 ; development of fruit of, 74, 

 77, 78, 82 ; germination of, 55 ; 

 cell-multiplication in germ-plant of, 

 56 ; development of leaves in, 63 ; 

 development of perianth in, 68 ; 

 spores of, 55. 



Ramification in Aneura, 44 ; in Antho- 

 ceros, 2 ; in Equisetacese, 275 ; iu 

 Jungermanniae, 64 ; Nees von Esen- 

 beck on, 85 ; in Metzgeria furcata, 

 42 ; in Ortlwtrichum affine, 132 ; in 

 Sphagnum, 137 ; Schimperon, 138. 



Rebouillia hemispherica, antheridia of, 

 122; archegonia, 113; calyptra, 

 113 ; fruit of, 114 ; development of 

 leaves of, 110; vegetative organs 

 of, 102. 



Receptacles of Marchanlia polymor- 

 phs, air- cavities and stomata of, 

 117. 



Rhizocarpeae, Mettenius and Schlei- 

 den on, 335. 



Rhizome, development of, in Equise- 

 taceae, 304 ; of Equisetum limosum, 

 278. 



Riccia glauca, buds of, 48 ; Schmidel, 

 Hedwig, Bischoff, Lindenberg, and 

 Unger, on the fructification of, 97. 



Riella, antheridia of, 99 ; archegonia 

 of, 99 ; fruit of, 1O0 ; germinal 

 vesicle of, 100 ; spores of, 100. 



Riella (Duriena) helicophylla, leaf of, 

 98. 



Riella Reuleri, mode of growth of, 

 98 ; leaves of, 98 ; shoots of, 99. 



Roper on the stem and fronds of Bo- 

 trychium, 309, 310, 311, 312; on 

 the exosporium of Isoetes lacustris, 

 338. 



Root-buds in Ophioglossum, 315. 



Rootlets of Metzgeria fureata, 42 ; 

 development of, in Pellia epiphylla, 

 23. 



Roots, adventitious, 203 ; occurrence 

 of in Equisetum, 278 ; production 

 of in Selaginella, 397. 



Roots, of Aspidium Jilix-mas, 229, 

 243 ; of germ-plants of Botrychium 



