074 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



in the Government of Tver (Russia). It infests the leaves, producing 

 grey-brown spots, with a violet film of mould. The conidiophores may 

 pierce the cuticle, but mostly protrude through the stomata ; they are 

 " bulbous " (rather swollen into an elongated spindle) at the base, and 

 branch freely. Each conidium is attached by a little sterigma, whose 

 substance becomes ultimately soluble in water (callose ?). Such sterigmata 

 the author found in every species of the order which he examined ; they 

 develop by the constriction and solidification of the conidiferous hypha 

 immediately below the attachment. — M. H. 



Millipedes and Centipedes {Jowrn. Hort. November 5, 1903, p. 

 424). — Life-size figures are given. Millipedes of the genus Julus are 

 hurtful. Centipedes of the Geophilus tribe are beneficial, feeding chiefly 

 on worms and slugs. — C. W. D. 



Mimosa Spegazzinii. By Sir J. D. Hooker (Bot. Mag. tab. 7899).— 



Nat. ord. Leguminosce, tribe Ewmmosece. Native of Argentina. It is 

 nearly allied to, and equally sensitive as, M. pudica. It is a scandent 

 bush, armed with recurved spines. Leaves have two pinna?, each with 

 numerous pinnules, margins having long bristles. Heads \\ inch in 

 diameter, rose-purple filaments. — G. H. 



Mint, Its World Cultivation (Le Jard. December 5, 1903, p. 365). 

 — In France the headquarters of the cultivation of Mints is near Sens, 

 where 80,000 lb. of oil is annually produced. In Germany it is produced 

 chiefly near Leipzig. Essential oil of Mint is also exported from China 

 and Japan. Several places in England are mentioned where Mint is 

 cultivated, but the finest quality in the world is that grown at Mitcham 

 in Surrey. — C. W. D. 



Mite-galls, Two " native." By E. Kiister {Flora, vol. xcii., 1893, 



pp. 380-395 ; 4 cuts). — Eriophyes diversipunctatus and E. fraxinicola 

 produce recidia on the Aspen and Ash respectively. Th former in- 

 habits the concave glands at the insertion of the leaf on the petiole, in- 

 ducing hypertrophy, the cavity deepening, and upgrowths from its base 

 becoming adnate finally make it labyrinthine. The Ash-gall is on the 

 leaf-blade, a typical "pouch-gall" due to a concave upgrowth of the 

 leaf, and the walling over of the entrance to the cavity by ingrowths 

 below ; as in the Aspen-gall, adnation takes place between the growths, and 

 the cavity is chambered. An exception among mite-galls is that in both 

 cases the cavity is quite glabrous, which the author relates to the adnation 

 of the ingrowths. Histological details are given ; and the stimuli that are 

 functional in the production of galls are discussed. — M. II. 



Mitosis of the Primary Nucleus in Syncfoytrium decipiens. 

 By F. L. Stevens and A. C. Stevens (Bot. Gaz. vol. xxxv. No. 6, p. 405, 

 plates xvi., xvii.). — This fungus is a parasite invading the cells of Falcata 

 COmota, and ultimately fills the cell by absorbing the protoplasm and 

 nucleus. The nucleus of this unicellular fungus-parasite exceeds in 

 size any one of ordinary flowering plants as 35 : 20 — 30. The division 

 of this primary nucleus is the first step to the formation of swarm spores. 



