SCIENTIFIC COMMITTEE, OCTOBER 27. 



ccxxi 



asked to consider and advise upon the proper nomenclature of tri-generic, 

 quadri-generic, and other hybrids, as it appears to the Orchid Committee 

 that not more than two generic names can conveniently be combined in 

 defining the origin of the hybrids." Several letters upon the subject 

 were considered, and suggestions were made as to the best methods of 

 forming names for these hybrids. It was finally proposed by Mr. Veitch, 

 V.M.H., and seconded by Mr. Hurst, F.L.S., that a sub-committee should 

 be formed to consist of five members of the Scientific Committee and 

 five of the Orchid Committee, who should confer together and further 

 consider the subject. This was carried, and Dr. Rendle, Messrs. Bowles, 

 Fawcett, Hurst, and Rolfe were appointed to represent the Scientific 

 Committee. 



Scientific Committee, October 27, 1908. 



Mk. E. A. Bowles, M.A., F.L.S., in the Chair, and thirteen members 



present. 



Fasciation in Beans. — Mr. Worsdell, F.L.S., remarked that though 

 the cause of this well-known phenomenon was so far unknown, in many 

 cases it appeared possibly due to an excess of nourishment directed to a 

 given spot, but it was also partly constitutional. He showed numerous 

 specimens of Bean seedlings (Phaseolus multiflorus) in which he had, by 

 removing the central shoot as soon as it made its appearance outside 

 the seed, induced fasciation in the shoots which arose in the axils of the 

 cotyledons. A majority of the plants treated had behaved in this way, but 

 not all. In P. vulgaris, in which the cotyledons are raised above the surface, 

 he had failed to induce fasciation, as the long hypocotyl apparently took 

 all the surplus nourishment from the cotyledons. Fasciated roots appear 

 to be rarely met with in nature, but he had been able to induce the forma- 

 tion of such in one case of Phaseolus vulgaris. After removing the radicle, 

 an adventitious root had sprung from the hypocotyl, and this had become 

 fasciated. 



Mr. Chittenden, on behalf of a correspondent showed a fasciated 

 stem of Calystegia pubescens. 



Adventitious shoots on leaves of Cardamine pratensis.~Mi\ Holmes, 

 F.L.S., showed leaves of Cardamine pratensis fl. pi. bearing well-developed 

 shoots arising from the tips and surface. The same phenomenon is 

 frequent in the single form as well as in the double. 



Viviparous grass. — Mr. Holmes also showed a specimen of Aira 

 caespitosa with numerous small branches springing from the nodes. 

 Such growths are very common in some grass species, and are often found 

 in the inflorescence, particularly after a period of wet weather. They 

 normally occur in that region in some species, as in Festuca ovina in 

 moist mountainous districts. 



Parasitic Rose canker. — Mr. Gussow showed specimens of this disease 

 due to the attack of the fungus Coniothyrium Fuckelii (see p. 222). 



Aerial Utbers in Achimenes grandiflora. — Mr. Hales, F.R.H.S., 

 showed specimens of this plant bearing numbers of greenish tubers in the 

 leaf axils. These tubers easily fell away, and were produced by plants 

 which had been grown on after they had finished flowering. 



vol. xxxiv. p 



