> 1907I CURRENT LITERATURE 461 



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M. L. Fernald (Rhodora 9:140-146. 1007), in a presentation of the eenus 



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America, recognizes 



\ {S. Richii).—G, F. Atkinson and C. W. Edgerxon (Jour. Mycol. 13:185, 1S6. 



1907; also Science N. S. 26:385, 386. 1907) have pubh'shed a ntv^ genus {Pro- 

 tocoronospora) of fungi discovered infecting the cultivated, vetch, and have pub- 

 lished it m two journals without any evidence as to which publication is to be 

 regarded as the original one. — C. H. Peck (Bull. Torr. Bot. Club 34:345-349. 

 1907) has described 12 new species of fleshy fungi, distributed among 8 genera. — 

 E. Hassler (Bull. Herb. Boiss. II. 7:718-740. 1907), in continuation of his 



1 Plantae Paraguariensis, publishes a new genus (Paradolichandra) of Bignoniaceae. 



■L. Radlkofer (Leaflets Philippine Bot. 1:208-211, 1907) has published 

 4 new species of Sapmdaceae from the Philippines. — ^J. M. C. 



Movement of water. — Dixon adduces experimental evidence ^° that Ewart's 

 K ' estimates "^^ of the velocity of the transpiration stream and the resistances it en- 



* coimters are vastlv too exeat. Ewart calculated from his data that it would 



require a head of water 6-$^ times the height of the tree to drive a sufficient 

 amount of water against the resistance encountered. According to Dixon's 

 data, with liberal allowances for transpiration, it would suffice to have a head 

 equal to the height of the tree. As to the soundness of the cohesion theory of 

 the ascent of water, against which Ewart had brought his conclusions as objec- 

 tions, Dixon says; *^ Apart from the weighty evidence which has elsewhere 

 adduced in its favor, the fact that other theories, both old and new, have to 

 assume properties for the waterways of plants which are either in the highest 

 degree improbable , .... or are even directly negatived by experiment, seems 



been 



support 



C. R. B. 



Light perception.— Another adverse report on Haberlandt's theory of the 

 lens-function of the epidermal cells in the perception of light is rendered by 

 NoRDHAusEN.^^' Unlike Haberlandt, who obliterated the lens action by a 

 film of water, and Kniep who reversed it by paraffin oil, Nordhausen used a 

 film of 5-10 percent, gelatin, whose refractive index is almost that of cell con- 

 tents. (By making the gelatin opaque with lamp black he used it also to exclude 

 light from the petiole, for which it is much superior to leather or paper.) He 

 found that the clear gelatin did actually eliminate the lens action of the convex 

 cells, and testing the ability of the leaf to respond to light in the ver>- plants used 



loDixox, H. H., On the transpiration current in plants. Proc. Roy. Soc. Lon- 



don B. 79:41-57. 1907 



Ewart 



London 



198:41-85. 1905. Also, The resistance to flow in wood vessels. Annals of Botany 

 19:111. 1905. 



" NoRDHAUSEX, M., Ueber die Bedeutung der papillosen Epidermis als Organ 

 fUr die Lichtperception des Laubblattes. Ber. Deutsch. Bot. Gesells. 25:398-410. 

 1907. 



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