NOTES AND ABSTRACTS. 



869 



P. rubra L. ; one of the most commonly cultivated in Europe. 

 P. tricolor Ruiz. & Pav. ; cultivated in Peru. 



P. tubcrculata Lodd. ; wild in rocky or sandy places, exposed to sun, 

 in various countries. 



Propagated by seeds, or cuttings in autumn, placed in pure sand in the 

 stove. — W. C. W. 



Plums as Bushes. By Alger Petts {Garden, No. 1704, p. 42; 

 16/7/1904). — When properly managed this is one of the most satisfactory 

 of all methods of growing Plums. Standard trees produce enormous 

 crops sometimes, but as a rule they bear only once in three years, in 

 what are known as good Plum years ; for the blossom is destroyed by 

 frost at least one year in three, while another year is used in recuperating 

 after the production of a heavy crop. They do well for market purposes 

 when well established, but for private gardens the bush presents great 

 advantages — the fruit is not blown off by the wind, insect pests can be 

 kept in check, protection can be afforded from the frost, a crop can be 

 reckoned upon almost every year, they are easy to prune, the fruit is 

 much finer both in size and quality, whilst four bushes can be grown in 

 the space occupied by one standard, the four being different varieties, and 

 so providing a succession of fruit, instead of an enormous quantity of the 

 same sort. — E. T. C. 



Polypodium, Certain Mexican and Guatemalan Species. By 



W. R. Maxon (U.S.A. Gontr. from Nat. Herb. vol. viii. 3, 1903 ; 2 plates). 

 Notes on the following species are given : — P. subpetiolatum Hook 

 (=P. biserratum Mart. & Gal.) ; P. legionariinn Baker ; P. frater- 

 num Cham. & Schlecht. The following new species are described : — 

 P. aquale, P. Teresce, P.firmulum, P.fissidens, P. adelphum ; and figures 

 of the pinnas are given. — F. J. C. 



Pomelo, Anthracnose of the. By H. Harold Hume (U.S.A. Agr. 

 Exp. Stn. Florida, Bull. No. 74, August 1904 ; 4 plates). — This disease 

 has appeared on the fruit during 1903 and 1904, which on examination 

 has been proved to be due to the attacks of Colletotrichum glceosporoides 

 (Penzig), the same fungus which produces leaf-spot, and occurs also on 

 the Lemon and Orange. The disease starts at the outside of the fruit, 

 and works inward as well as around it. It is confined to the rind for a 

 considerable period. Ultimately the flavour of the whole fruit is altered. 

 When placed in a moist chamber the disease soon embraces the whole 

 fruit, and the rind becomes very dark in colour. As a rule, all fruits 

 attacked drop soon after the fungus has well started. 



The conditions favouring the disease are the starved condition of the 

 tree, abrasions caused by wind, injuries by frost, the presence of other 

 forms of disease, such as die-back, foot-rot, &c, attacks of insects, and 

 bruises or abrasions, however caused. 



All diseased fruit should be removed, collected from the ground, and 

 buried deeply or burned. Cut out and burn all dead and diseased 

 branches, rake up and burn all leaves lying about, and under affected 

 trees. Trees on which diseased leaves appear should be sprayed with 



