290 DR. J. W. HESLOP HARRISON ON 



I have examined, likewise yielded fertile seeds. The connec- 

 tion between these observations and those of Barclay, in view 

 of the phenomenon of apomixis displayed by J?, rubigiuosa, 

 seems significant. 



Lastly, in the lengthy series of examples of mollis X pini- 

 pinellifolia and of mollis X canina (forma ?), received by me 

 from the Norwegian rose student Traaen, practically every 

 hip dissected had its quota of neatly shaped, well filled seeds; 

 very scarce indeed were the chaffy scales so numerous in the 

 majority of hybrid fruits. Considered alongside my fertile 

 mollis \ pimpinellifolta cross, these Norwegian specimens from 

 Mostero, etc., by their fertility, throw some light on the 

 relationship between the two component forms, and suggest 

 that R. mollis and R. pimpiiiellifolia are much more closely 

 allied than one naturally expects. If we couple this suspicion 

 with the fact that R. pimpinellifolia can throw a semi-Villosan 

 form in the Faroe Islands, the near genetical dependence of the 

 one on the other seems reasonably well established. 



Ripened fruits and fertile seeds, therefore, in the widest 

 rose crosses, are the exception rather than the rule, and we 

 must dismiss as inaccurate the optimistic views of Smith, 

 Hooker, Baker, Dumortier, Woolly-Dod and others. 



Obsertmtions on the Hybrid Forms, 

 (i) R. pimpinellifolia X R. lutetiana. 



I found a plant, unfortunately badly damaged by fire, 

 referable to the above cross in a dene near Horden, Durliam. 

 It was growing at a wood edge where the tiny sandhill form 

 of R. pimpinellifolia (var. spinosissima) came into contact with 

 a mass of a rose with very dark glaucous leaves, running 

 down to the variety glavcescens of R. lutetiana. To the latter 

 the hybrid approached very nearly in the colour and serration 

 of its glabrous leaves, although its armature was midway 

 between that oi glaucescens and spinosissima. This is the R. 

 hibernica var. glabra of Baker. Almost certainly the rose 

 recorded by me from Cowpen Bewley as pimpinellifolia X 

 glatira in the same plant. 



