Morphologie und Teratologie. 537 



vascular tissues, but also in the structure of the mycorhizal 

 root. The Strands of the Ieaf-trace in § Eiwphioglossum connect, 

 as in other Ophloglossaceae, into a single Strand before insertion 

 on the System of the axis. In 0. penduliim, and 0. simplex 

 they remain as separate Strands, which are individually inserted 

 on those of the axis. It is proposed to add this fact to the 

 diagnosis of the § Ophioderma Prantl. Together with the 

 species above named 0. intermedlum Hook, is grouped in the 

 § Ophioderma. These are believed to form a natural group, 

 anatomically distinct, which illustrate three phases of proportion 

 of the spike to the subtending leaf lamina. In 0. penduliim 

 the sterile lamina is large and sometimes irregularly branched, 

 in 0. intermedlum it is small and simple: in 0. simplex it is 

 absent, while the spike is still large. These three species may 

 illustrate either a descending or an ascending series: the more 

 probable view seems to be that they illustrate decrease of the 

 sterile leaf, and the extreme condition of 0. simplex is attri- 

 buted to the presence of Mycorhiza, which makes nutrition 

 of the large spike still possible in the dense wet forest in which 

 it grows. Reduction is however not apparent in the spike itself. 

 The alternative view is that 0. simplex may represent a primi- 

 tive simplicity such as that suggested by Campbell (Mosses 

 and Ferns, p. 296—297). F. 0. Bower. 



Bruntz, L., Les the'ories morphologiques concernant 

 la structure primaire de la tige des Phanerogames. 

 — Leurs critiques. (Bull, de la Soc. des Sc. de Nancy. 

 Ser. III. T. IV. 1903. p. 228.) 



Mr. Bruntz passe en revue les differentes theories qui 

 ont ete emises sur la Constitution de la tige des Phanerogames. 

 D'apres ces theories la tige a ete consideree comme formee 

 par un ensemble: 



1° de Racines provenant d'un bourgeon (envisage comme plante 

 entiere). De la Hire. 



2° de queues (prolongements de faisceaux de feuilles). Agardh. 



3° de systemes descendant des phytons (feuilles considerees comme 

 unites). Gaudichaud. 



4° de faisceaux libero-ligneux monocentres ou unipolaires. Bertrand. 



5° de rachis (parties caulinaires des phytons). Dangeard. 



6° de prolongements de bases des feuilles. Bonnier. 



M. Bruntz considere que ces theories ne representent 

 pas l'expression de la verite et qu'elles sont de simples vues 

 de l'esprit, des conceptions metaphysiques, sans aucune realite 

 objective. 



En se basant sur l'embryologie de la plante et I'anatomie 

 comparee des tiges (Phanerogames, Cryptogames vasculaires, 

 Mousses), l'auteur emet cette opinion que la tige n'est pas due 

 ä la coalescence des prolongements inferieurs de bourgeon ou 

 de feuille, mais que les trois membres de la plante ont la meme 

 valeur anatomique, avec cette difference toutefois que feuilles et 

 racines procedent de la tige. Tison (Caen). 



