532 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Daphne Blagayana. By Thomas Smith (Garden, May 15, 1909, 



p. 241 ; fig.)- — The writer suggests that the mistake usually made with 

 regard to this plant is grafting it on D. Mezereum, and that when plants 

 are purchased in this condition layering should be resorted to. — H. B. D. 



Dendrobium Bronekartii. By R. A. Rolfe (Bot. Mag. tab. 8252). 



]sTat. ord. Orchidaceae ; tribe Epidendreae. Indo-China. An epiphytic 



herb ; 2-3 feet long ; leaves 4-5 inches long, 1J-2| wide ; racemes lax, 

 pendulous, many-flowered ; flowers nearly 2 inches across, white, lip 

 yellow with a white border. — G. H. 



Deutzia setehuensis. By J. Hutchinson (Bot. Mag. tab. 8255). — Nat 



ord. Saxifragaceae ; tribe Hydrangeae ; China. An undershrub ; leaves 

 lanceolate, 2-4 inches long, 1J inch wide, papery ; inflorescence corym- 

 bose, many-flowered ; flowers, white, § inch across. — G. H. 



Diseases of Coeo-nuts in the West Indies. By F. A. Stockdale, 

 B.A., F.L.S. (Journ. Imp. Dep. Agr. W.I., vol. ix. No. 4, 1909).— Three 



forms of disease are recognized, viz. : 



Root Disease, presumed to be caused by a species of Botryodiplodia ; 

 Leaf Disease, attributed to Pestalozzia palmarum (Cooke) ; and 

 Bud Rot Disease, associated with bacteria, but subject to farther 



investigation. — M. C. C. 



Diseases of Deciduous Forest Trees. By H. von Schrenk and 



P. Spaulding (U.S.A. Dep. Agr., Bur. PI. Ind., Bull. 149; June 1909, 

 plates).— The principal diseases of deciduous forest trees in America are 

 grouped under (1) environmental diseases ; (2) those due to miscellaneous 

 parasitic and saprophytic organisms ; (3) those due to wound fungi ; 

 (4) sap rots ; (5) decay of structural timber. 



Under the first heading the effect of sulphur gases and smoke is 

 considered and the common trees are placed in the following order, 

 beginning with the most susceptible to injury and ending with the least : 

 Pinus Strobus, Tsuga sp., Pinus virginiana, P. rigida, Quercus Prinus, 

 Hickoria sp., Quercus marilandica, Q. alba, Q. minor, Castanea dentata, 

 Quercus digitata, Q. coccinea, Liriodendron tulipifera, Acer sp., Nyssa 

 sylvatica. The degree of discoloration of foliage due to fumes is also 

 described. Unfavourable soil conditions and the symptoms such as 

 "stag-headed " condition, etiolated foliage, etc., are dealt with at length. 

 Injuries due to extreme cold and wind and animals are also included in 

 "environmental diseases." 



In the second group some parasitic flowering plants with their hosts 

 are described, including mistletoe (Phoradendron florescens (Pursh.) 

 Nutt.), and others of similar habit like Arceutliobium cryptopoda Engel. 

 and A. ptisilhtm Peck. Some epiphytic plants, especially Tillandsia 

 usneoides L. and T. recurvata L., as well as mosses and lichens, par- 

 ticularly when abundant, are credited with causing injurious results. 

 Mildews, rusts, leaf-blights and spots, cankers, root rots, and slime-flux 

 diseases are all included in this section. 



The major portion of the Bulletin is devoted to " wound fungi " — fungi 

 which gain an entrance into the tree through wounds, and which are by 



