HYBRIDISATION. 



97 



over the surface of the sepals. When cxcinuned under the microscope 

 the papillae of M. auiahilis are seen to be cone-shaped, those of 

 M. Veitchiana are spheroidal, b\it those of the hybrid are club-shaped 

 and exactly intermediate between those of the two parents. This is 



Sections of ppidi'imis from lateral sepals of — 1, Masdevallia Veitchiana, bearing spheroi'lal hairs ; 2, ,V. 

 ciDiahilis, bearing cone-shaped hairs ; 3, M. X Chelsoni, bearing club-shaped hairs. All X 450. 



well shown in the accompanying illustrations which arc copied from the 

 plates in Dr. Macfarlane's paper, in the Transactions of the Royal 

 Society of Edinburgh. 



