578 Anatomie. — Varietäten etc. — Physiologie. 



morphologically similar to these abnormal fused leaves of the 

 Austrian Pine. Agnes Arber (Cambridge). 



Breakwele, E., A study of the leaf-anatomy ofsome na- 

 tive species of the genus Andropogon N. O. Gramineae. 

 (Proc. Linn. Soc. New South Wales. XXXIX. 2. p. 285—394. 1914.) 



The investigation has been carried out from a systematic and 

 ecological point of View. The anatomical structure of the following 

 species is dealt with individually and in great detail: A. interme- 

 diiis, R. Br., A. affinis, R. ßr., A. sericeiis, R. Br., A. homhycimis, 

 R. ßr., A. ischaemum, Linn., A. refmctus, R. Br., It is found that 

 the species under discussion fall into 3 well marked groups, viz: 

 I. A. intevmediiis, A. affinis j A. sericeus. 

 IL A. ischaemmn. 



III. A. refvactus, A. bombyciutis. 



Andropogon ischaemum differs from the first group in the much 

 greater dävelopment ot the sclerenchymatous tissue, which, howe- 

 ver, is not as great at that of the third group. The cuticle is also 

 thicker and another characteristic difference is the nature of the 

 vascular bundles, which are much more numerous and more den- 

 sel}'' crowded than in any other species. A. refvactus and A. hont- 

 bycinuni differ widely from any species of the other two groups. 

 The external development of scierenchyma, the thick nature of the 

 cuticle on both surfaces and the arrangement of stomata in grooves 

 are characteristic features not seen in any other species. The xero- 

 phytic characters are comparatively dealt with and their relation 

 to habitat pointed out. E. M. Jesson (Kew). 



Jensen, A., Caltha palustris (L). Lidt Variationsstatistik. 

 (Flora og Fauna 1914. 4. p. 117—118. Silkeborg 1914.) 



Previous statistics on the number of sepals having shown that 

 the average number is greater in Germany than in Sweden an 

 investigation in danish specimens from Jelling in Jutland shows 

 an intermediate average. For instance, in Holland and Germany 

 there are no flowers with 4 sepals, in Den mark 05 per cent, in 

 southern Sweden (Skane) 0.7, in middle Sweden (Härjedalen) 

 3.5 per cent. It seems that the number of sepals decreases with 

 increasing latitude. 



This may he due to the existence of small subspecies with dif- 

 ferent numbers of sepals. An examination ofsome specimens points 

 in this direction. the different specimens giving differeiit curves 

 of Variation. Ove Paulsen. 



Bakke, A. L., Studies on the Transpiring Power of 



Plants as indicated by the method of standardized 



Hygrometric Paper. (Journ. Ecology. II. 3. p. 145—173. 2 figs. 



1914.) 



The cobalt paper method is here used to investigate transpira- 



tion in a number of plants, and an attempt is made to formnlate a 



scheme of ecological Classification on the basis of transpiring power. 



The introduction describes the more recent modifications introduced 



by Livingston and other American workers, and the literaiure 



of the subject is summarised. Bakke used 3 p. c. cobalt chloride 



on thin filter paper, which as shown by a table gives results with a 



