64 FUNGOID PESTS OF CULTIVATED PLANTS. 



one cell. Of those which occur on the foliage of Lilies there is one 

 species which is found in Germany on Lilium canadense, and called 

 both Uromyces Lilii and Uromyces Liliacearum, which has since been 

 included as a variety of Uromyces Erythronii, a conclusion the accuracy 

 of which we venture to doubt. 



Another species on leaves of Lilium has been called Uromyces Haben- 

 horstii, and is also found in Germany. This has also been attributed by 

 Saccardo as a form of Uromyces Erythronii. In both these species the 

 teleutospores, which have been communicated to us, differ from each 

 oiher and from the typical form of those in Uromyces Erythronii. 



The last species is probably distinct : it occurs on Lilium canadense 

 leaves in the United States (Uromyces Lilii, Clint.), but hitherto we 

 have not seen it, and should scarcely venture an opinion. The teleuto- 

 spores are rugulose (36-37 x 20-25 /*). 



LILY DISEASE. 

 Botrytis elliptica (Berk.), PI. VI. fig. 80. 



The history of this disease seems to have been most mysterious 

 throughout, since it was several years after its first appearance before any 

 light could be thrown upon its cause. It was in 1881 that specimens 

 were sent to the Rev. M. J. Berkeley in such a condition that he was 

 able to detect a small white mould as the probable cause of the mischief, 

 which he called Ovularia elliptica (Gard. Chron. Sept. 10, 1881, with 

 figure). Afterwards, by some means, it acquired the name of Botrytis 

 elliptica. 



Attention being called to it again, it was made the subject of refer- 

 ence in 1888, when it was figured again (in Gard. Chron. Aug. 18, 1888, 

 fig. 21), and then for a time was permitted to rest, but not for long, 

 since Marshall Ward, in 1889, under the name of Botrytis, evidently 

 introduced the same mould into his account of the Lily disease, and 

 figured it as a species of Botrytis. 



This may, or may not, be the same mould as the Botrytis parasitica 

 (Cav.) on Tulip stems, alluded to by Massee, but of which no description 

 is given. 



Then Saccardo intimates that the Polyactis cana, which he calls 

 Botrytis canescens, attacks the immature fruits of Lilies. 



Last of all we find the name of the mould buried altogether, and the 

 disease attributed to Sclerotinia, a kind of Peziza, or Ascomycetous 

 fungus, which, at the same time, it is confessed, has never been seen, and 

 the existence of which is only suspected. A rather curious episode in 

 "imaginative mycology," which is seeking to supplant the old-fashioned 

 " science of fact." 



Under all these circumstances we prefer to retain the name of Botrytis 

 elliptica, and not travel into the region of romance. 



This disease attacks most species of Lilies. Rust-coloured patches 

 come upon the leaves and buds, as if they had been burnt, if the buds are 

 not completely destroyed ; the flowers become imperfect and distorted, 

 and the whole plant has a blighted appearance. 



The threads of the mould arise from the creeping mycelium, and are 



