Physiologie. — Palaeontologie. — Algae, 147 



Zuckerspeicherung in der Rübe, sondern auch für die Verarbeitung 

 derselben von Bedeutung sind; Schattenrüben sind minderwertig. 



L. Linsbauer (Klosterneuburg). 



Penhallow, D. P., Contributions to the Pleistocene Flora 

 ofCanada. (Amer. Nat. XLI. p. 443—452. figs. 1—2. 1907.) 



This is a continuation of the authors previous studies on the 

 flora of the interglacial beds of the Don Valley in Canada. The 

 present contribution adds species of Ostrya, Gleditschia, Cercis and 

 Acer to this flora, the Gleditschia and Acer being described as new. 



Berry. 



White, D., A remarkable fossil tree trunc from the mid- 

 dle Devonic of New York. (Bull. 107. N. Y. State Museum, 

 p. 327—340. pl. 1 — 11. 1907.) 



This paper is based on a specimen from the top of the Portage 

 group near Naples, N. Y., which is described as Archaeosigillaria 

 primaeva. This unique specimen is over 3,2.5 meters long, by far 

 the largest Lycopodiaceous tree yet found in rocks older than the 

 Carboniferous. Systematicallj^ it represents the archaic group which 

 serves to unite the genera Bothrodendron, Sigillaria, Lepidodendron, 

 and Lepidophloios and which has been generically termed Archaeo- 

 sigillaria or Protolepidodendron j and is here set apart as a distinct 

 family, the Protolepidodendreae. Berry. 



"Wieland, G, R., Historie Fossil Cycads. (Amer. Journ. Sc. 

 XXV. p. 93-101. 1908.) 



Continuing his studies of the Cycadaceae the author presents 

 notes based on an examination of the truncs of Cycadeoidea etrusca 

 Cap. & Solms, and C. Reichenbachiana (Göpp.) Solms, the two most 

 famous cycad trunks known to science. Both show characteristic 

 bisporangiate strobili similar to those of the American forms de- 

 scribed in the authors recent monograph. The remarkable speci- 

 mens of Williamsonia gigas from the English Jurassic preserved at 

 the Jardin des Plantes are also described and a specimen showing 

 the mature fronds attached to the parent stem and the latter pro- 

 longed as a bract covered peduncle of the Williamsonia type is 

 figured. Berry. 



Largaiolli, V., Le Diatomee del Trentino. XXI. Lago 

 Santo [Bacino dell' Adige]. fAtti Accad. ven.-trent.-istr., Cl. I, 

 Vol. IV, p. 125—129. 1907.) 



L'auteur decrit le Lago Santo dans le Tr entin et enumere 

 sa flore diatomique; eile comprend 45 especes et varietes dont plu- 

 sieurs sont nouvelles pour le T rentin; ce sont Navicula elliptica 

 Ktz., Gomphonenia abbreviatum Ag. var. longipes J. Brun., Diatonia 

 tenue var. mesoleptum J. Brun. et Cystopleura turgida Ehr. var. 

 granulata J. Brun. R. Pampanini. 



Largaiolli, V., Ricerche biolimnologiche sui laghi 

 trentini. VI. II lago di Tovel [Bacino del Noce]. (Atti 

 Accad. ven.-trent.-istr. , Cl. I, Vol. IV, p. 1—7. 1907.) 



L'auteur decrit le lac de Tovel (Trentin) et en enumere les 



