926 JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Dendrobium Pierardi, Roxb. (Cogniaux in Diet. Icon. Orch., 

 Dendr., pi. 26; 5/1901).— Originally described by Roxburgh in 1823. 

 Sepals and petals pale rose ; lip pale primrose. A native of India. 



C. C. H. 



Dendrobium transparens, Wallich. (Cogniaux in Diet. Icon. 

 Orch., Dendr., pi. 27; 9/1901). — A native of the Himalayas, discovered 

 in 1849. Flowers small, white tinted rose, with purple blotch at base of 

 lip.— C. C. H. 



Dianthus Hybrids. By Amelung (Gartenflora, p. 449, pi. 1,490; 

 1/9/1901). — A coloured plate of the parents and hybrids resulting from 

 the crossing of Dianthus Caryophyllus S (the Carnation) and Dianthus 

 chinensis ? (Chinese Pink). The hybrids have the stiff stems of the 

 Chinese Pink, and a faint odour of the Carnation. In colour and size 

 of the flowers the hybrids are intermediate between the two parents. 



/. P. 



Disese, Monogrraph of (concluded). By R. Schlechter {Engl. Bat. 

 Jahrh. xxxi. pp. 289-813; 10/ 12/1901).— Includes a few remaining 

 species of the genus Disa, and the small genera Schizodium and Brown- 

 leea. — A. B. B. 



Diseases of Red Cedar. By H. von Schenk {U.S.A. Dep. Agr., 

 Div. of Veg. Pathology, Bull. 21 ; 1900. 7 plates and 8 figures).— The 

 pamphlet describes the two diseases " white rot,^ caused by Polyporus 

 juniperus, n. sp., and the "red rot," caused by Polyporus earneus, w^hich 

 attack the Red Cedar {Jimiperus virginiana). The fungi and the 

 injuries w^hich they produce are described and illustrated. — F. J. C. 



Dismal Swamp Reg'ion, Report on a Botanical Survey of the. 



By Thomas Kearney (U.S.A. Dep. Agr., Div. Bot., U.S. Nat. Herb., vol. v. 

 No. 6, 1901). — The climate of the region, giving temperature, illustrated 

 by comparative tables of the thermometrical records at various stations, 

 with data showing the latest and earliest frosts. Sunshine and cloudi- 

 ness, together with atmospheric humidity, precipitation, and wind, are 

 followed by a general summary of the above. 



The geography and physiography of the region deals with general 

 geography and prominent physiographic features of the beach, dunes, 

 salt-marshes, plain, and swamps. 



Geology, embracing soils of the salt-marshes, sand strand, and plain, 

 with reference to the so-called " truck " soils, also general observations, 

 are followed by descriptions and analysis of samples of same, taken at 

 various stations. The wooded swamps are thoroughly dealt with in 

 regard to their organic matter, acidity, clay content, texture, water, 

 drainage, and soil analysis. 



The plant covering of the region, its physiognomy and ecology, vnih 

 formation classes of maritime, salt-marsh, and sand- strand formations, 

 are well treated. Also adaptation to environment in the vegetation, with 

 illustrations of the principal life forms. Modifications due to the 

 mechanical action of the wind, protection against excessive transpiration 

 and light, pollination, and dissemination of seeds are ably dealt with. 



