584 JOURNAL OF THE KOYAL HORTICULTURAL SOCIETY. 



destruction of hardpan (but this gives poor results) ; surface flushing so 

 as to remove the surface deposit of alkali ; flooding without under- 

 drainage. An appendix gives a list of native plants which indicate the 

 presence of too great a quantity of alkali for successful cultivation. The 

 plants named are Suaeda sp., Allcnrolfca occidentalis, Atriplex sp., 

 Frankenia grandiflora campestris, Bigeloioia veneta, Centromedia pungens, 

 Pluchea sericea, Distichlis spicata, Hordeum murinum, and Leptochloa 

 imbricata. —F. J. C. 



Aloe campylosiphon. C. H. Wright (Bot. Mag. tab. 8134).— Nat. 

 ord. Liliaceae ; tribe Aloineae ; Tropical Africa. Leaves 15 inches, 

 bright green with whitish spots ; flowers coral-red. — 67. H. 



Aloe nitens. By W. Watson (Bot. Mag. tab. 8147).— Nat. ord. 

 Liliaceae-, tribe Aloineae ; South Africa. Stem 12 feet high; panicle 

 with about 7 spikes, densely many-flowered ; perianth green ; filament 

 red-orange. — G. H. 



Aloe pallidiflora. By A. Berger (Bot. Mag. tab. 8122).— Nat. ord. 



Liliaceae ; tribe Aloineae ; South Africa (?). A stemless plant. Leaves 

 tapering to a long point, 14 inches long, dull green but marbled with long 

 whitish marks, margin with strong, deltoid spines ; inflorescence 

 2^-4 feet high ; perianth pale flesh -colour, yellowish within. — 67. H. 



Angraeeum infundibulare. By R. A. Rolfe (Bot. Mag. tab. 

 8153). — Nat. ord. Orchidaceae ; tribe Vandeae ; Tropical Africa. This 

 has large white and pale yellow fragrant flowers, the lip broadly 

 elliptical-ovate, with a slender curved spur. —67. H. 



Aphides. By J. Barsacq (Le Jardin, vol. xxi. No. 498, p. 348 ; 

 November 20, 1907 ; 8 figs.). — Much confusion exists as to the species 

 and habits of the Aphidia. M. Barsacq classifies some species of the genus 

 Schizoneura, pointing out at the same time that they are apt to migrate 

 from one plant, or part of a plant, to another, which has caused mistakes 

 in classification. Schizoneura ulmi L. lives in spring on the tender 

 leaves of the elm ; when these get tough it descends to the roots of 

 currant and gooseberry bushes, where it has been distinguished by the 

 name of Schizoneura fodiens, and even mistaken for the redoubtable 

 S. lanigera, although in reality comparatively harmless. — F. A. W. 



Apospory and Apogamy in Ferns, Studies in. By J. Bretland 

 Parmer and L. Digby (Ann. Bot. vol. xxi. April 1907, pp. 161-197; 

 5 plates).— The cytological features of seven species of ferns are first 

 recorded. This is followed by a general discussion on the phenomena of 

 apogamy and apospory, and includes a suggested table for the classification 

 of the different types that are known to occur. 



The authors believe that, though alternation of generations is normally 

 associated with the periodic reduction in the number of chromosomes, no 

 necessary correlation exists between the two phenomena, and therefore the 

 problem of alternation must be settled by evidence other than that derived 

 from the facts of meiosis. — A. D. C. 



