1885.] THE FOREST FLORA OF CARiSfARVONSHIRE. 267 



*Cuscuta curopmi. Very abundant in several clover fields on a farm 

 midway between Bangor and Bethesda. In some instances 

 extending into the adjoining woods. Introduced with the 

 clover seed. 



BOKAGINE.E. 



Ecliimn vulgarc. Plentiful along roadsides and the waste corners of 



plantations. 

 Lithospcrmum officinale. In a few woods near Bangor. 

 Myosotis palusti'is.^ 



M. arvensis. > Not unfrequent in woodland ditches. 



M. versicolor. _) 



Cynoglossum officinale. Abundant in woods. 



SOLAXACE^. 



Hyoscyamus niger. Sparingly between two woods on the sea-shore 



opposite Capel-Ogwen. 

 Solanum Dulcamara. Twining amongst brambles on the roadside 



close to Capel-Ogwen. 



OROBANCHACE^. 



Orolanche major. Abundant on gorse at Talybont. 



*0. elatior. I have found a few specimens of this rare parasitic 

 plant. 



*0. minor. Sparingly on ivy and other plants, but varying ac- 

 cording to situation, and the plants on which it is parasitic. 



The Autumn Tints of Foliage. — Mr. Sorby, erst President of the 

 Eoyal Microscopic Society, makes out such tints to be solely owing 

 to chemical changes. Two of the four green pigments on which the 

 tint of leaves depends disappear; nearly colourless products may 

 for a time replace them, but these give way to highly coloured 

 pigments. A reduced vitality aids such changes. When green 

 sorrel leaves were stuck by their stalks into moist ground, those 

 exposed to the sun with their under-side turned upwards, developed 

 a bright red, while those in the shade did not develop any colouring. 

 Thus, too, partially broken leaves or twigs change colour, though the 

 other parts of the tree remain green. 



