CXCV111 PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Scientific Committee, November 9, 1915. 



Mr. E. A. Bowles, M.A., F.L.S., F.E.S., in the Chair, and nine members 



present. 



Fungus on Yew.- — Dr. A. S. Home reported that Mr. Ramsbottom 

 had identified the fungus shown by Mr. Bowles at the previous 

 meeting from a Yew tree trunk at Myddelton House, Waltham Cross, 

 as Poly poms lad ens. 



Four-carpelled Honesty. — Mr. W. C. Worsdell, F.L.S., said that he 

 had further examined the curious dissepiment of Honesty sent to 

 the last meeting, and had come to the conclusion that the fruit of 

 which it was a part was four-valved. This conclusion was subse- 

 quently corroborated by a letter from Mr. Staley, the sender, who 

 said that the fruit had four valves, but some were lost before he 

 could send them. This was the only fruit of the kind on the plant. 

 Four-valved fruits had been described in the case of Capsella Bursa- 

 pastoris, Cheiranthus, Brassica, and I satis, and a higher number of 

 valves has sometimes been found ; in some cases plants possessing 

 them have been found to breed true to the high number of valves. 



Black Spot in Roses. — Dr. Home drew attention to the origin 

 and spread of an outbreak of black spot in Roses in a garden which 

 he had had under observation. The first Roses were planted in 1911, 

 and included H.P., H.T., and Tea Roses, as well as a few climbers. 

 Additional Roses, including ' Juliet ' and several standard Roses, 

 were added in 1912 ; in 1913 ' Noella Nabonnand,' ' Madame Leon 

 Pain,' ' Una/ and ' Lyon ' were added. No trace of black spot (due 

 to the attack of Actinonema Rosae) appeared until 1914, when the 

 two dwarf ' Lyon ' Roses were affected, and soon lost all their leaves. 

 Towards the end of the season a few of the lower leaves of ' Noella 

 Nabonnand ' were also spotted. In 1915 not only was ' Lyon ' 

 completely defoliated, but 'Madame Leon Pain,' 'Madame Abel 

 Chatenay,' and ' Una,' in the same row with ' Lyon/ lost nearly all 

 their leaves, and the spot spread to a number of other Roses. The 

 varieties affected (in addition to those already mentioned) were : 

 ' Caroline Testout/ ' Mrs. J. Laing/ ' Frau Karl Druschki,' ' Gruss 

 an Teplitz/ ' Hugh Dickson/ ' Madame Ravary/ ' Carmine Pillar/ 

 ' Laurent Carle,' ' Juliet/ ' Mrs. Sharman Crawford/ ' R. G. Crawford,' 

 and ' Killarney.' It seems evident that the introduction of the black 

 spot was due to the introduction of the ' Lyon ' Rose, and that it 

 spread from that to other Roses of various types with ease. 



Seedlings of Trees. — Mr. J. Fraser, F.L.S., said he had recently 

 found seedlings of a variety of trees on the Leatherhead Downs, 

 twenty-seven in all, and that in one gravel-pit he had found three 

 species of Lemna (L. polyrrhiza, L. minor, and L. trisulca), and the 

 rare Wolffia arrhiza, the smallest of flowering plants. 



Adventitious Bud on Fern. — Mr. H. B. May sent a piece of the 

 Fern Microlepia platyphylla with an adventitious bud. 



