228 JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



strong on well-nourished plants, and appear to arise from external condi- 

 tions, though transmitted by heredity. — M. H. 



Liparis tricallosa (Ckird. Chron. p. 225; fig. 85; 6/4/1901).— 

 Described and figured. — G. S. S. 



Lithothamnia of the Museum d'Histoire Naturelle, Paris. 



By F. Heydrich (Engl. Bof. Jahrh. xxviii. pp. 529-545, t. xi. ; 

 11/1/1901). — A systematic account of the AlgjB of this group, preserved 

 in the Paris Museum, with descriptions of numerous new forms. — A.B. B. 



Lobelia tenuior (Gard. C/iro«. p. 46 ; fig. 26; 19/1/1901).— 

 Described and figured. — G. S. S. 



Lonicera pyrenaica (Cain-lfullaccce), Pyrenees (Bot. Mag. tab. 

 7774). — This has been in cultivation since 1793. It forms a small shrub 

 in the Rock Garden, Kew. It has small, narrow obovate leaves and pairs 

 of white or pale-rose coloured flowers, | in. in length, with a regular 

 border. — G. II. 



Lythrum rivulare, Wood & Evans. By J. ]\Iedley Wood and M. S. 

 Evans {Joitrii. But. 461, p. 172; May 1901). — Description of a new 

 species, from Report of Natal Botanic Gardens for 1900. — G. S. B. 



Magnolias. By AV. J. Bean {Gard. Mag. 2m, p. 180 ; 23/3/1901). 

 — A full descriptive account of all species and varieties of Magnolias in 

 cultivation, with illustrations of M. stellata, M. conspicua, and variety 

 Soulangeana. A valuable account for reference to all interested in these 

 beautiful trees and shrubs. — W. G. 



Malaxideen, Zur Biologic der. By K. Goebel {Flora, 1891, Pt. 1, 

 p. 94). — This deals with the European genera Microstylis, Malaxis, and 

 Sturmia only. As Irmisch showed, the bulbs are true pseudo-bulbs of 

 shoot origin exclusively, unlike those of Ophryde^. Irmisch erred in 

 ascribing a velamen to the roots. The mature pseudo-bulb is, however, 

 surrounded by a loose sheath formed of the bases of the sheathing leaves. 

 The cells of this sheath have a ligneous thickening, spiral in Malaxis 

 (velamen fashion), reticulate in Microstylis and Sturmia, the cell- wall often 

 being perforated, and in all respects adapted to absorb water ; similar 

 reticulate cells occur in the stems. The morphology of the successive 

 shoots and their leaves is elucidated. Root-hairs, or rhizoids, are given off 

 from the back of the lower leaves, a condition rarely present [or at least 

 described] in flowering plants. The presence of a symbiotic fungus in the 

 axis outside the central cylinder is described, less abundantly developed 

 in the leaves and roots. The whole structure is specially adapted to allow 

 the plant, with a scanty root system, to draw to the largest extent on the 

 soil for mineral constituents. — M. H. 



Malvaceae, Experiments in Crossing* the various Genera of 



this Order. By H. Lindemuth {Gartenflora, p. 8; 1/1/1901). — 

 Ahutilon Thompsoni crossed with two named varieties of Malva gave 



