I 



V] Reversion in Orchids c^^ 



i 

 Laivrenceamim Hyeamim when selfed, gave 14 albinos, but 



in addition, one colonized plant, which ]\Ir Cookson tells me 



cannot be thought to have resulted from error. Such an 



occurrence is as yet unaccountable, but otherwise all is clear. 



In addition to the cases given above there are many in 

 which C. insigne Smideriamim and insigne Sanderae were 

 used, but Mr Hurst tells me that of these the latter is 

 certainly a tinged type, while the former has some dark 

 hairs on its petals which may contain sap-colour. Some of 

 the crosses with these types gave reversionary offspring, 

 and others gave various whites. 



The genus Cattleya provides another list of comparable 

 cases. For instance 



C. Mossiae Wagenerix C. Gaskelliana alba gave 4 albinos 



(Hye). 



„ „ X C. intermedia u^^.s^ gave 14 albinos 



(Holford). 



C. Schrdderae alba x C. iritermedia alba gave coloured 



offspring (Cookson). 



C Gaskelliana alba x C. Ha7'7'iso7iiana alba gdiVe/i^colovw^d 



plants (Thwaites). 



X C Warneri alba gave 5 albinos and 

 2 coloured plants (Peeters). 



x C. Mendelii alba gave 2 F^ pink 

 flush (Thwaites, Gard. Chiton. 

 1910, I. p. 62). 



From these statements it may with great probability be 

 inferred that the albinism of Mossiae Wageneri, Gaskelliana 

 alba and intermedia alba is du^^ he absence of one factor 

 (say C) ; that in Hannsoniaii ' ■" '^nd \hrdderae alba it 

 is the other complementary fi 'c^ s wanting (sa)' R)\ 



and that Wariieri alba is hetc^S v. ^ for the presence of 

 "ne of them (being Cc, on thhr nenie). It is to be hoped 

 ^ome Orchid grower will 'lake the various unknown 

 'ons and extend the '<^. 



^ besides the cas iumerated, many instances 

 in Cypi ^ Cattleya, other genera, of various 



tinged type. '^ true -n self-fertilised and giving 



reversionary coi jftsp'^ when crossed. 



B. H. 7 



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