244 Physiologie. — Palaeontologie. — Algae. — Eumycetes. 



types of N. Tabacum and of five varieties of N. rustica will germi- 

 nate readilv in darkness." Trelease. 



Hooker, H. D„ Mechanics of movement in Drosera rotundi- 

 folia. (Bull. Torrey Bot. Club. XLIV, p. 389-403. 1917.) 



The osmotic concentration in cells of Drosera rotundifolia 

 tentacles was measured by plasmolysis in potassium nitrate and 

 glucose Solutions. Measurements were made on straight, bending, 

 bent and unbending tentacles. The osmotic concentration in the 

 cells on the abaxial side of the stalle, in the growing region, was 

 found to diminish during bending; no change was observed on the 

 adaxial side. The decrease in osmotic concentration is aecounted 

 for by the increase in volume of the cells, and is therefore consi- 

 dered an effect and not a cause of their elongation. There is no 

 indication that changes in permeability oecur. 



The elongation is produced by a decrease in the elasticity of 

 the cell-walls, and is later fixed by growth. The movement of tenta- 

 cles is therefore brought about by the same mechanism found in 

 geotropically reacting organs, where a decrease has been observed 

 in the osmotic concentration in the cells whose growth causes 

 bending. 



Similarities between hydrotropic reactions and autotropic unben- 

 ding of tentacles and of geotropicalty bent roots indicate that the 

 growth on the coneave side which brings about the unbending is a 

 response to changes resulting from the difference in osmotic con- 

 centration present during bending. As in hydrotropic reactions, 

 growth takes place on the side with the higher osmotic concen- 

 tration. Jongmans. 



Barry, E. W., A middle Eocene Goniopteris. (Bull. Torrey Bot. 

 Club. XLIV. p. 331-335. PI. 22. 1917.) 



The author describes G. claiborniana from the Eocene of 

 Columbia, Louisiana, Yegua formation. It oecurs also in the 

 sandy clays of the Lisbon formation near Newton, Mississippi. 

 It shows a peculiar venation by which it is distinguished from all 

 other tertiary species described as Goniopteris, Lastrea and Phegop- 

 teris. In other characters the new species resembles Lastrea stiriaca 

 Heer. The author brings some remarks, especially on venation, on 

 some other forms of this group of tertia^ ferns. Jongmans. 



Gail, F. W., Some experiments with Fucus to determine 

 the factors Controlling its vertical d istribution. (Pub. 

 Puget Sound Biol. Sta. Univ. Wash. II. p. 139—149. Dec. 1918.) 



The conclusion is reached that light is a Controlling factor in 

 determining the lower limit of Fucus. W. B. McDougall. 



Fair man, C. E., New or noteworthy Ascomycetes and 

 lower fungi from New Mexico. (Mycologia. X. p. 239 — 264. 

 Sept. 1918.) 



Contains as new: Eutypella Brunaudiana Ribis-aurei, Diatrype 

 Standleyi, Didymella nigrescens Dearn. & Fairrn., D., Eurotiae, Apio- 

 sporella cornina, Rhabdospora dumetorum , Leptosphaeria nigricans 



