36 Biologie. — Morphologie etc. 



vollständig platzt, gehören zu den Familien Caryophyllaceae , Ramiyi- 

 culaceae, Rosaceae, Geraniaceae, Gentianaceae , Scrophulariaceae. \''on 

 diesen haben die meisten {Agrostemma, Bartschia u. a.) geschützte 

 Staubfäden. — Bemerkenswert ist, dass die Compositen in grosser 

 Ausdehnung {Matricaria discoidea, Centaurea cyanus u. a.) einen 

 stärkereichen und resistenten Pollen besitzen. 



Die Ursache der fast durchgängigen Resistenzfähigkeit des 

 Pollens der nordskandinavischen Pflanzen ist schwer zu erklären. 

 Verf. hält es für wahrscheinlich, dass auch diese Erscheinung in 

 Verbindung mit herabgesetzter Vitalität stehe und dass hier ein 

 Zusammenhang zwischen Pollenresistenz und Mangel an osmotisch 

 wirkenden Substanzen vorhanden sei. Grevillius (Kempen a. Rh.). 



B[oodle], L. A., The Root and Haustorium of Buttoiiia 

 natalensis. (Kew Bull. Mise. Inf. VI. p. 240—242. Fig. 1-2. 1913.) 



The material examined included several roots of the parasite 

 with their haustoria attached to the roots of the host plant which 

 is a Euphorbia (probably E. grandidens). A colouring matter pre- 

 sent in the root and the anatomy of the root and haustoria and the 

 method of attack of the latter are discussed. 



W. G. Craib (Kew). 



Burlingame, L. L., The m o r p h ol o g y o f Araucavia brasüien- 

 SIS l. The Staminate cone and malegametophyte. 

 (Botan. Gaz. LV. p. 97—114. pl. 4-5. Feb. 1913.) 



The staminate cones are unusually large, and contain an enor- 

 mous number of pollen grains in the pendent sporangia. The 

 number and size of these sporangia is subject to wide fluctuations. 

 In the development of the gametophyte the prothallial cells divide 

 a number of times, and the nuclei of these cells are eventuallj^ set 

 free, as in Podocarpus. In this condition the pollen is shed, and is 

 deposited on the ovuliferous scale at some distance from the nucel- 

 lus; here it remains for about a year, at the end of which period 

 it sends out a long pollen tube containing two unequal male cells. 



M. A. Chrysler. 



Chamberlain, C. J., Macrosamia Moorei, a connecting link 

 between living and fossil cycads. (Botan. Gaz. LV. 

 p. 141 — 154. Feb. 1913.) 



The Australian genus Macrosamia differs from most other 

 cycads in possessing several or even many cones which are situated 

 in the axils of leaves, a condition recalling Cycadeoidea. The struc- 

 ture of the male gametophyte resembles that of cycads previously 

 studied. The embryogen}' as far as illustrated by the material is of 

 the type seen in Cycas. M. A. Chrysler. 



Chrysler, M. A., The Origin of the Erect Cells in the 

 Phloem of the Abietineae. (Botan. Gaz. LVI. p. 36—50. 12 tigs. 

 1913.) 



The origin and development of the "erect cells" in the phloem 

 of the Abietineae was studied in all the genera, except Keteleeria, 

 but Pinus was made the basis of the investigation. The erect cells, 

 occurring on the margins of the medullary rays, are a secondary 



