760 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



strobi is a native of Europe, and occurred originally on the Cembran Pine. 

 When the Weymouth Pine was introduced it was attacked with greater 

 virulence, hence the more frequent records of this Peridermium on it. 



W. G. S. 



Cembran Pine Leaf-cast. By H. C. Schellenberg (Nat. Zeit. 

 Land-Forst. i. pp. 306-9, 1903). — The author records the common oc- 

 currence of this in nurseries in Switzerland, and ascribes to this the paucity 

 of seedlings in the older forests. The leaf -cast is traced to Lophodermium 

 jtiiuistri, a fungus already well known to cause leaf-cast on Scots and 

 Austrian Pine. Experiments proved that infection of the Cembran Pine 

 may take place from diseased needles of Scots Pine. For the successful 

 culture of Cembran Pine, a mixture with Larch and Spruce (which are 

 not attacked by this fungus) is better than planting with Scots Pine. 

 Since the disease is always most destructive in the nursery, the Cembran 

 and Scots Pines should not be grown near each other. — W. G. S. 



Centaureas. By G. G. (Gard. Mag. 2632, p. 242, 9/4/04). — A 

 review of the species and varieties of this genus, with historic, descriptive, 

 and cultural notes. Both perennial and annual species are dealt with. 



W. G. 



Cerasus serrulata rosea plena. By Ed. Andre (Rev. Hort. 

 pp. 440-1, Sept. 16, 1904 ; photograph and coloured plate). — A very hand- 

 some and floriferous double form, with large rosy, mauve-flushed, double 

 flowers in bunches. — G. T. D. 



Cercospora resedae. By C. Gebhardt (Die Gart. No. 17, p. 195, 



January 23, 1904). — A destructive parasitic fungus often found on 

 Beseda odorata. Plants treated with the well-known Bordeaux mixture, 

 although slightly affected, survived, while the non-treated plants died 

 before flowering. — G. B. 



Chamaedorea pulchella. By W. B. H. (Bot. Mag. t. 7959).— 

 Native of Tropical America. Nat. ord. Palmed ; tribe Arecece. A slender 

 Palm with terminal crown of leaves, 4 feet long. Male panicle much 

 branched, corolla pale yellow ; female inflorescence unknown. — G. II. 



Chara, The Development of the Spermatozoid in. By 



David M. Mottier (Aim. Bot. xviii. April 1904, pp. 245-254; 1 plate). 

 The author made a study of spermatogenesis in Chara fragilis. The 

 mature spermatozoid consists of a band of cytoplasm, a nucleus, a 

 blepharoblast, and two long cilia. The blepharoblast, which is a 

 modification of the plasma membrane, extends the whole length of the 

 spermatozoid. No centrosome-like body, as described by other writers, 

 was observed. — A. D. C. 



Chemotropism of Roots. By P, C. Newcombe and A. L. Rhodes 

 (Bot. Gaz. xxxvii. No. 1, p. 23). — This gives an account of experiments to 

 discover whether roots are] influenced by certain chemical salts &c. by 

 applying them t') one side only of the roots. While some showed no 

 curves (e.g. Lupinus albus) with potassium nitrate, Radish " showed a 



