Floristik u. Systematik der Phanerogamen. — Palaeontologie. 493 



vers le haut. L'auteur attribue ce phenomene a ce que, sous 

 le couvert du sapin, le jeune sapin seul peut vegeter; tandis 

 que sous le couvert du hetre, la graine du sapin, en raison de 

 sa legerete, se repand plus vite et plus loin et le jeune sapin 

 occupe le sol avant que le hetre ait pu y lever. 



Mais le point initial de cette transformation est dans Paction 

 de Thomme. Au cours des siecies precedents, les abus de 

 päturage et d'exploitation ont, dans la plupart des forets de 

 France, assure la predominance du Hetre sur le Sapin. Le 

 phenomene de la supplantation du hetre par le sapin est la 

 consequence d'une loi naturelle et le resultat prevu d'une lutte 

 pour la vie en. agee entre deux especes de temperament peu 

 different. C. Flahault. 



Wheldon, J. A. and Wilson, Albert, West Lancashire 

 plants. (Journ. Bot., London. XL. 1902. p. 346—350.) 



Notes of recent observations since the pubücation of similar ancl 

 previous Iists. B. Daydon Jackson. 



BERRY, Edward, W., Liriodendron Celakovskii Velen. (Bull. 

 Torr. Bot. Club. Vol. XXIX. July, 1902. p. 478.) 



Exception is taken to Velenovsky's reference of a leaf 

 from the Cretaceous clays near Kuchelbad in Bohemia, to the 

 genus Liriodendron, the objection being based upon a dose 

 comparison of the petiole, venation and form of the leaf base. 

 While placing special emphasis upon this point, he directs 

 attention to the more probable relation of the leaf to Cissites, 

 a genus remarkable for its inclusion of heterogeneous forms 

 which in all probability represent a number of different genera. 



D. P. Penhallow. 



Sellards, E. H., On the Fertile Fronds of Crossotheca and 

 Myriotheca and on the spores of other Carboni- 

 ferous Ferns from Mazon Creek, Illinois. (Amer. 

 Jn'l Sc. Vol. XIV. 1902. p. 195. pl. VII.) 



An additional account is given of Crossotheca sagittata. 

 The plant is dimorphic and the sterile fronds were referred by 

 Lesquereux to Pecopteris abbreviata Brong., although an un- 

 published manuscript by the same author shows the two forms 

 of the froncl in connection. In the Yale collection, both fertile 

 ancl sterile parts are shown in direct connection in a number 

 of cases. The sporangia are attached side by side in a single 

 row without grouping, and the fact that the individual members 

 are often filled with spores, permits a confirmation of Zeil ler 's 

 statement that they are sporangia, and not, as held by Stur, to 

 be interpreted as the fringes of a dehiscent sporocarp. 



Crossotheca trisectata Seil., appears as a new species 

 distinguished by its distinctive, fertile pinnules which are tri- 

 sectate. The central lobe is elongate-ovate or nearly round, 

 and borne upon a slender stalk. The smaller and round, 



