136 



DR. J. W. HKSLOP HARRISON ON 



many novelties accruing would have served to augment our 

 lists. My most noteworthy finds were Btyum IVarneum, 

 B. calopJiylhuii and Fallavicinia Flototuiana. 



Considering now the most interesting of Brewster's original 

 records, we decide that TroUiiis is by far the most attractive. 

 Generally looked upon as of montane proclivities, here it 

 luxuriates not ten feet above sea level, and consequently one 

 is spurred on to enquire as to what new characters have been 

 acquired in response to its novel environment. To secure 

 accuracy in such a determination, my friend Bolam sent me 

 roots from two levels (1,000 ft. and 1,800 ft. respectively) 

 near Alston, and others from about 500 ft. at Wark in 

 Northumberland. These I grew alongside the local form. 

 Wide divergences were at once perceptible between the 

 Pennine and the Tees Marsh specimens ; those from Wark, 

 near as they approached to the mountain form, were never- 

 theless intermediate. To put them concisely the main 

 differences between the two extremes may be tabulated as 

 follows : — 



Character. 



Upland Form. 



Lowland I'orm. 



Flower Buds. 



Greenish. 

 Yellow. 



Reddish brown. 



Colour of Flowers. 



Slightly deeper. 



Bracts, 



Not so leaflike and few. 



Leaflike and man}'. 



Flowering Spike. 



Short and rarely, if ever, 

 branching. 



Long and branching 

 frequently enough. 



.Seed]5ods. 



Rich dee]} i)uri)lc in 

 colour. 



(Jnly \ery faintly so. 



Leaves. 



Much more compact 

 owing; to the close - 

 nes^ of the segments ; 

 on an average not so 

 long. 



Freer in growth in all 

 these characters. 



