540 THE ORCHID REVIEW. [May, 1907, 
siders to be obviously Mendelian, but he remarks that more evidence and 
much careful investigation are necessary before one can venture to deal 
confidently with such complicated material. 
«“\ contribution to the study of Spontaneous Hybrids in the European 
Flora,” by Mons. E. G. Camus, contains a paragraph reflecting European 
hybrid Orchids, but details are not given, as the catalogue was considered 
too long for inclusion in the Report. Some of these, however, both British 
and Continental, are included in a paper on ‘“‘ Natural Hybrids,” by R. 
Irwin Lynch, M.A., V.M.H. 
Prof. Pfitzer, of the University of Heidelberg, read a paper on 
‘‘ Hybridisation and the Systematic Arrangement of Orchids,” in which he 
points out that marked differences in vegetative structure must be considered 
as impediments to hybridisation, the doubtful Phaiocymbidium being the 
only exception. He alsoconsiders that all the genera which have hitherto 
been successfully crossed are very nearly allied. A second paper, published 
at the end of the Report, “ On the phylogeny of Orchids” has a melancholy 
interest, being found npon his writing-table after his death, and forwarded 
to the Society by his executors. It discusses some interesting questions 
relating to the systematic affinities of Orchids, and the development of the 
various tribes and smaller groups. 
‘Natural Hybrids of the Cattleya Group,” by R. Allen Rolfe, A. Lia 
is an analysis of the numerous hybrids of Cattleya and Lelia which havg 
been found among importations of the parent species. First is given an 
historical summary, in which the appearance of the various forms Is given, 
with remarks on their parentage. This shows that forty-four natural 
hybrids have been recognised, consisting of twenty-four Cattleyas, eight 
Lelias, eleven Lzlio-cattleyas, and one Brassocattleya, eighteen of which 
have also been raised by hand. Then comesa table showing their geographical 
distribution, showing seven from Mexico and Guatemala, one from Colombia, 
one from the Upper Amazon district, ten from Bahia, four from Minas 
Geraes, seventeen from the Rio de Janeiro district, and four from Santa 
Catherina. Two cases, however, are pointed out as doubtful. Taking the 
species from which natural hybrids have been recorded we find eight from 
Cattleya intermedia, five each from C. bicolor, C. Forbesi, C. Leopoldi 
and C. Loddigesii, four each from C. Schilleriana and Lelia albida, three 
each from C. guttata, C. Harrisoniana and C. Warneri, while thirteem 
species are credited with two each, and seventeen others with only a single 
one. Figures are given of C. X Hardyana, C. x Victoria-Regina, C. * 
Schreederiana, Lelia x Finckeniana, L. x Gouldiana and Lelio-cattley@ x 
Pittiana. The paper concludes with a complete bibliography, showing : 
references to descriptions and figures, with full synonymy. 
“Hybrid Odontoglossa,” by De Barri Crawshay, F.R.H.S., is au . 
imei ae ease ee | 
