Anatomie. — Morphologie etc. 499 



Dans la nervation de chaque lobe foliaire de la feuille du Feriila 

 conitmmis L., deux faisceaux interviennent seulement: 



P. La nervure mediane du rachis qui donne la nervure medi- 

 ane du Segment dans lequel eile se rend en se l'usionnant au pas- 

 sage avec la nervure marginale, qui poursuit sa route dans le rachis. 



2^. La nervure marginale situee du cöte oü va se difförencier 

 le Segment et qui donne les deux nervures marginales decedernier. 



Cette struciure est en somme conipliquee et en tout cas eile 

 s'eloigne beaucoup de celle d'une feuille simple ä nervation pennte 

 dont le limbe serait profondement decoupe. 



Cette derniere dispositon, que les livres classiques semblent at- 

 tribuer ä la feuille dans son ensemble, ne se rencontre que dans 

 les dernieres ramifications du limbe qui paraissent correspondre ä 

 des folioles. Jongmans. 



Atwell, R. S., The appearance of polar bodies in the 

 spermogenous tissue of Ricciocarpus natans (L.) Cor da. 

 (Bull. Torrey Botan. Club. XLI. p. 333—336. PL 8. 1914.) 



The writer describes centrosome-like bodies in the antheridium 

 of Ricciocarpus natans. The bodies lie in the position of true cen- 

 trosomes. The origin of these bodies was not taken up. They de 

 not seem to be permanent organs as they arise and disappear with 

 each new division. Jongmans. 



Black, C. A., ßranched cells in the prothallium of Onoclea 

 sensibilis. (Bull. Torrey Botan. Club. XLI. p. 617—620. PI. 22, 23. 

 1914.) 



In a forgotten culture (six weeks old) of prothallia of Onoclea 

 sensibilis L. parts of the prothallia- were entirely submerged. In 

 these the cells were greatly elongated and contained few chloro- 

 plasts scattered throughout. It was of interest to note that many 

 cells had produced one or more outgrowths without cutting of the 

 usual cross wall. 



Besides the filament of elongated cells characteristic of impo- 

 verished prothallia, these prothallia differ from the normal gameto- 

 phyte in one or more of the following characteristics: 



1. A change in the direction of growth of the filament may 

 occur by the apical cell forming an acute angle with the raain cell 

 thread. 



2. The production of an irregularly lobed apical cell. 



3. An individual cell in the filament may develop an outgrowth 

 or brauch without forming a cross wall at the base. 



4. A branched filamentous prothallium may have the prolifera- 

 tions originating in one cell. 



5. An increase in the number of growing regions. 



Jongmans. 



Fischer, G. C, Seed development in the genus Peperomia. 

 (Bull. Torrev Botan. Club. XLI. p. 137—156, 221—241. PI. 3-6. 

 1 Textfig. 1914.) 



The Contents of this paper are summarized by the author as 

 follows: 



The primary archesporial cell is Single and subepidermal in all 

 species of Peperomia examined. 



