SCIENTIFIC COMMITTEE. 



xciii 



L. rotundifolius. The third type has rather smaller flowers, darker in colour, and 

 is of a bushy habit. They flower freely from the end of June to mid-September, 

 but the form with bushy habit did not remain in flower so long last year as the 

 others. L. rotundifolius started to flower the first week in June and was over by 

 July 8. This year the hybrid began to flower on June 6. L. tuberosus is now in 

 full flower. The root-stock of the hybrid is creeping, with sessile tubers, inter- 

 mediate between the two parents. 



Mr. Jones has 17 F 8 seedlings, of which six appear to be of upright habit and 

 four bushy. The others are too small to be sure about. 



The seeds of the hybrid were mainly oblong, and of 256, 155 were spotted (60 

 black with paler spots, 95 light with black spots), the remainder black, whereas 

 in L. rotundifolius of 289 seeds, 202 were black, 49 black with light spots, 38 

 light with black spots. 



A Certificate of Appreciation was recommended to Mr. Marsden Jones. Mr. 

 Jones also showed a number of forms of Centaurea radiata from various localities 

 in comparison with the normal form of C. nigra. 



Scientific Committee, August 12, 1919. 



Mr. E. A. Bowles, V.M.H., in the Chair^and two members present, 

 with Mr. L. Smith, visitor. 



Hybrid Pelargoniums. — Mr. Langley Smith showed a series of hybrid Pelar- 

 goniums which he had raised, and described their characteristics. He promised 

 to bring them up again at a later date (see p. xcv). A Certificate of Appreciation 

 was unanimously recommended to Mr. Smith. 



Currants injured. — Mr. Bowles showed currant cuttings attacked by a sub- 

 terranean form of aphis, which Mr. Fawcett took for examination (see below). 



Red form of Trifolium repens. — He also showed a red-flowered form of 

 Tri folium repens from Mr. Van der Weyer. 



Bulbils on aerial stems. — Mr. Scrase Dickens sent a Watsonia showing bulbils 

 in great quantity at the nodes, and Mr. Cheal an onion with four bulbs on top of 

 a stem under 6 inches in height. 



Scientific Committee, August 26, 1919. 

 Dr. A. B. Rendle, M.A., F.R.S., and Mr. Hales present. 



Currants injured. — Mr. F. Laing of the British Museum reported as follows 

 upon the currant cuttings taken by Mr. Fawcett : " The aphis on the roots 

 of the currant is the root form of one which curls the leaves of elms 

 (Schizoneura ulmi). It was originally described by Buckton as S. fodiens, but 

 the migration between the elm and Ribes has since been established. The root 

 form sometimes causes considerable damage to the roots of young Ribes plants, 

 causing them to split. 



" The aphis on the roots is known as Myzus ribis Linn. It causes the leaves 

 to assume a puffy red appearance, the leaves ultimately withering. It is very 

 prevalent this year. Quite recently (two months ago) Miss Haviland published 

 a paper on its life-history, wherein she maintains that this species migrates to 

 dead nettles, and has hitherto been known as Phorodon galeopsidis Kalt. This, 

 however, will probably require confirmation. Up till the appearance of this 

 paper it was not known what became of M. ribis in the late summer." 



Scientific Committee, September 9, 1919. 

 Dr. A. J. Voelcker, M.A., in the Chair, Mr. Hales, and Mr. Stanbury, visitor. 



Stereum purpureum. — Mr. Stanbury exhibited forms of Stereum which he 

 had found growing on the stems of plum and Portugal laurel. 



Buds on leaves. — Mr. Hales showed specimens of tomato plants bearing 

 adventitious buds upon the leaves. 



Poppy with short stamens. — Mr. Hales also showed a flower of Papaver orientale 



