420 Floristik, Geographie, S3"stematik etc. 



trat Wulfenia carinthiaca Jcq. auf. Hier wächst eine neue Petasites- 

 {Nardosinia)- Ari mit beiderseits weissfilzigen Blättern, die mehr dem 

 nördlichen P. frigidus (L.) Fries ähnelt. Am Bastrik wurde Cen- 

 tauvea Kosaiiini Hayek und die pinnate Potentilla Visianit Panc. ge- 

 sammelt. Matouschek (Wien). 



Füller, G. D., Evaporation and Soil Moisture in Relation 

 to the Succession of Plant Association s. (Bot. Gazette. 

 LVIII. p. 193-234. 27 figs. Sept. 1914.) 



The observations recorded in this paper were made in the 

 Chicago region in selected plant associations by the use of the 

 porous cup atmometers devised by Livingston and Trouseau. 

 Graphic tables and photographs are given. The data, given as 

 results, represent the evaporation rates in the lower aerial Stratum, 

 and the ränge of soil moisture in the upper subterranean strata of 

 the Vegetation of the various associations. The evaporation rates for 

 different habitats were studied. Füller linds that its ratios be- 

 tween evaporation and growth water in the beech-maple forest, 

 oak-hickory forest, oak dune, pine dune, and cottonwood dune 

 associations have been shown to have comparative values of 100, 

 65, 20, 17 and 15 respectively, and the differences, thus indicated , 

 are sufficient to be efficient factors in causing succession. The cor- 

 responding value of this ratio in the prairie association is 62. 



Harshberger. 



Gates, F. C, Winter as a Factor in the xerophily of cer- 

 tain Evergreen Plant s. (Bot. Gazette LVII. p. 445— 489. June 

 1914.) 



The results of the author's investigation were presented as a 

 thesis for the degree of Doctor of Philosoph}^ in the University of 

 Michigan. The thesis considers the seasonal history of peat bog 

 plants, such as, the evergreen ericads, deciduous trces and shrubs, 

 and herbaceous plants; the structure of certain peat bog plants fol- 

 lowed by experimentation under which heading are treated mate- 

 rials and methods, experimentation during winter (transpiration 

 influence of Solution temperature upon transpiration, rate of con- 

 duction of a 0.5 per cent aqueous Solution of lithium nitrate, rela- 

 tion of water to the xerophily of peat bog ericads); experimentation 

 during the summer (transpiration, rate of conduction, relation of 

 Summer to the xerophily of peat bog ericads); experimentation upon 

 the condition of the stomates with conclusions and summar3\ Gates 

 concludes that during the winter the transpiration and rate of 

 conduction of water are much higher in the evergreen plants than 

 in the deciduous ones. In the summer, the rate of transpiration 

 and conduction in the herbaceous plants, and in the deciduous 

 Woody plants, is much higher than in the evergreen shrubs and 

 trces. He finds, that the more xeromorphic the structure of the 

 leaves, the lower is the transpiration, and the more exposed to 

 winter conditions, the more xerophytic is the structure. 



Harshberger. 



Gerard, F., Trois nouvelles especes dcChlaenacees. (C.R. 

 Ac. Sc. Paris. CLVIII. p. 1704— 1705. Juin 1914.) 



Description, sans diagnose latine, des especes suivantes qui- 



