236 Floristik u. Systematik der Phanerogamen. — Palaeontologie. 



who has recently shown that this phenomenon is a wide-spread one and 

 Böggild also objected to this theory, pointing out that the deposits 

 taken irom the sea between Iceland and Jan Mayen are pure deep 

 sea deposits. 



An evidence against the theory of a post-glacial land-bridge iinds 

 Warming in the absence of not introduced wild terrestrial mannuals 

 and the absence of reptiles and toads. Another he sees in the great 

 number of temperate-european and atlantic plants vvhich can hardly be 

 assumed to have migrated across a land-connection because even if such a 

 post-glacial land-bridge did exist, its climatic circumstances would hardly 

 suit these plants. 



The fact that '/« of the species of vascular plants occur on Single, 

 small areas seems to Warming only to indicate an occasional immi- 

 gration. 



That plants do migrate across the sea is shown by the composition 

 of the flora of Jan Mayen containing 39 wide-spread arctic species, and 

 the flora of the Azores which consists of plants of an easterly origin, 

 from Europe, Madeira or the Canaries. 



Of means of transport the following may have very little importance 

 for this question (as already pointed out by Ostenfeld): birds, ocean 

 currents and floating ice and timber, of greater consequence is however 

 the wind and last not least the agency of man during nearly thousand 

 years. 



The author concludes his paper thus: 



Taking every thing into consideration, I am fully convinced that 

 the whole of the flora — at least all the more highly organized land- 

 plants — have immigrated after the glacialperiod, across the 

 sea, and from the nearest countries lying east, especially 

 from Great Britain. Porsild. 



WEINHART, M., Nachträge zur Flora von Augsburg. 



(35. Bericht des Naturwissenschaftlichen Vereins für Schwaben 



und Neuburg. 1902. p. 155 — 156.) 



Verf. publicirt neue, durch H. Lutzenberger aufgefundene Stand- 

 orte für 18 Pflanzenarten, von denen Viola pratensis M. und K., Inula 

 hirta L. , Hieracium glaucum Ali. und Atriplex portnlacoides Wallr. 

 hervorgehoben seien. Wangerin. 



Zang, R., Fragaria Hauchecornei. (Naturwissenschaftliche 



Wochenschrift. N. F. II. 1902. p. 154.) 



Verf. berichtet darüber, dass er im Sommer 1902 Gelegenheit hatte, 

 die zuerst von Gr aebner beschriebene Erdbeerform (var. Hauchecornei 

 Graebn.) zu beobachten; es handelt sich um Pflanzen, welche ihre völlig 

 gereiften, saftig rothen Früchte, umgeben von dem mehr oder minder 

 unversehrten Kranze der weissen Blumenblätter, zur Schau tragen. Der 

 Verf. konnte bei seinen Exemplaren die verschiedenen Stufen der Varietät- 

 bildung deutlich verfolgen. Wangerin. 



Fritel, [P. H.]. Paleobotanique (Plantes fossile s). Pet. 



in 8°. IV. 347 pp. 412 fig. 36 pl. Paris, les fils d'Em. 



Deyrolle. (Histoire naturelle de la France. 24 e Partie.) 



M. Fritel a reuni dans ce volume les diagnoses et les figures des 

 especes les plus abondantes et les plus caracteristiques des differents 

 etages geologiques connus en France pour renfermer des gisements de 

 vegetaux fossiles. La liste de ces etages est tout d'abord donnee en 

 detail, avec mention des gisements principaux constates dans chacun 

 d'eux et resume sommaire des caracteres essentiels de la flore. Les 

 divers etages sont ensuite etudies successivement, dans leur ordre geo- 



