414 Morphologie und Teratologie. 



ing to the gametophyte of the Psilotaceae and Sphenophylleae 

 are not available in this comparison. 



What the meaning is of this parallelism between leaf-size 

 and characters of the sexual organs it is difficult to see; a 

 further difficulty in its interpretation lies in the fact that for the 

 Equiseta the parallelism does not hold; there „Filicinean" 

 characters ot the gametophyte accompany entirely non-filicinean 

 characters of the sporophyte, the latter showing nearer analogy 

 to the Lycopods than to the Ferns. Such cross characters are 

 difficult to harmonise with any phylogenetic theory; on account 

 of them, the Equisetineae are placed in an isolated position, and 

 in the same way, though with less pressing grounds, a separate 

 position shouid be accorded to those types which lie between 

 the extremes of Lycopods and Ferns, in proportion as the 

 characters are more or less pronounced. 



On this basis the Isoetaceae would probably best take their 

 place as a sub-series of the Lycopodiales, Ligulatae ; the 

 Psilotaceae and Sphenophylleae would constitute a series of 

 Sphenophyllales, separate from, but related to, the Lycopodiales. 

 The Ophioglossaceae would form an independent series of 

 Ophioglossales, more aloof than the latter from the Lycopodiales, 

 but not included in the Filicales. The actual connection of 

 these series by descent must remain open; it is quite possible 

 that some or all of them may have originated along distinct 

 lines from a general primitive group, which may be provisionally 

 designated the Protopteridophyta ; these were probably small- 

 leaved strobiloid forms, with radial types of construction, and 

 with the sporangia disposed on some simple plan. The group- 

 ing arrived at in these Memoirs may be tabulated as follows: 



Pteridophytü. I • Lycopodiales. a) Eli gulatae : Lyco- 

 podiaceae; b) Ligulatae: Selaginellaceae, Lepidodendra- 

 ceae, Sigillariariaceae, Isoetaceae. II. Sphenophyllales: Psilo- 

 taceae, Sphenophyllaceae. III. Ophioglossales: Ophioglossaceae. 

 IV. Filicales: a) Simplices: Marattiaceae, Osmundaceae, 

 Schizaeaceae , Gleicheniaceae , Matonineae ; b) Gradatae: 

 Laxsomaceae, Hymenophyllaceae, Cyatheaceae, Dicksonieae, 

 Dennstaedtiinae, Hydropterideae(f); c) Mixtae: Davallieae, 

 Lindsayeae, Pterideae, and other Polypodiaceae. V. Equi- 

 setales: Equisetaceae, Calamarieae. Bower. 



Ledoux, P., Sur le developpement du Cicer arietinum L. 

 apres des sectionnements de l'embryon. (Comptes 

 rendus des seances de l'Academie des sciences de Paris. 

 T. CXXXVI. 9 mars 1903.) 



L'auteur a seme des graines de C. arietinum dont i! avait, 

 au prdalable, enleve un ou deux cotyledons ou la gemmule. 

 La pousse principale ou les pousses axillaires des cotyledons 

 qui se sont alors developp^es presentaient divers faits de 

 regression anatomique et morphologique. Lignier (Caen). 



