DISEASE AND INSECTS 53 



which is the source of the mischief. The same fungus 

 has been found also on Freesia, Antholyza, and Hemerocallis. 

 It is recorded from Britain, France, Italy, and Germany, 

 and is known also from New Zealand, the Cape of 

 Good Hope, and North America. The first notice for 

 Britain is by Dr Cooke in the Gardeners' Chronicle of 

 June gth, 1894. Another species is very destructive to 

 Pinks and Carnations, while a third has been found 

 upon the leaves of the Auricula. Dr Cooke suggests 

 that, if not too firmly established, the disease may be 

 overcome by spraying with ammoniacal copper carbonate 

 solution. It consists of water 16 gallons, carbonate 

 of copper I ounce, carbonate of ammonia 5 ounces. 

 " Mix the carbonate of copper and the carbonate of 

 ammonia, and dissolve in about a quart of hot water ; 

 when dissolved add 1 6 gallons of cold water." This 

 no doubt may be regarded as a good receipt for other 

 fungoid pests. It must be remembered that no outward 

 application can affect the mycelium within the tissues, 

 unless the leaves are also killed, the object being always 

 to kill the spores, which appear as very fine dust, and 

 perpetuate the fungus. 



Iris Brand. This I note only from Dr Cooke's 

 article in the Journal of the Royal Horticultural Society, 

 vol. xxvii. It is caused by Puccinia Iridis, D.C., and is 

 represented in plate v., fig. 91. It is found on the 

 leaves of many species of Iris, besides I.foetidissima and 

 L germamca. Dr Cooke believes that this is the fungus 

 called by Berkeley P. truncata. He says, " The uredo- 

 spores * are found in crowded pustules, at first covered, 

 then exposed, of a rusty brown colour, crowded 

 together, and either subglobose, elliptical, or ovoid, 

 externally rough and ochraceous. The teleutospores * 



J The uredospore is produced in summer, and reproduces the same 

 form of the fungus ; the teleutospore is produced later, remains dormant 

 during the winter, and in spring produces a distinct form of the same 

 fungus. 



