74 



it even as a mere neighbour the least dangerous to oaks in cases of neglect, or where 

 regular thinning has not been duly administered." — p. 61. 



We are gratified in observing that tlie words " Indigenous and In- 

 troduced" have been inserted in the title on the wrappers of the parts 

 before us, in accordance with a suggestion in our notice of the first 

 part of this work. 



Art. XXIX. — Varieties. 



34. Polypodium calcareum and Dryopteris. I consider these plants to be quite dis- 

 tinct, the former having truly the erect habit which Smith describes ; I believe also 

 that the pubescence is constantly present in P. calcareum. The two species are gene- 

 rally found in different habitats, but in a wood on the side of Ingleborough, as you go 

 to Weathercote, they are found in company. I have cultivated them side by side for 

 many years, with their respective characters unchanged. — W. Wilson ;* Warrington, 

 July 5, 18il. 



35. Woodsia Ilvensis and hyperhorea. I have never had the slightest difficulty in 

 distinguishing these plants, the first by its ovate, the second by its oblong pinnae. 

 Woodsia Ilvensis was found by me many years ago near Llyn y Cwn, and by no one 

 else in modern times, but those whom I have directed to the spot. I believe however 

 it is the " Filix Alpina, Pedicularis rubras foliis subtus villosis" of Ray (Syn. 118), 

 although I must confess I have only seen Woodsia hyperborea on Clogwyn y Garnedd, 

 the habitat recorded by Ray. — Id. July 5, 1841. In a short visit to the Snowdon dis- 

 trict last month, I found a few plants of W. Ilvensis in the old locality, but they ap- 

 peared weak and dwindling for want of sufficient earth. — Id. September, 1841 . 



36. Botanical Excursion to Teesdale. Having arrived at Middleton, in Teesdale, 

 Durham, a little before 12 o'clock on the 21st of August, 1838, after taking some re- 

 freshment I set off for Langdon beck, cheered by sun-gleams, which had suddenly 

 succeeded heavy clouds and rain. I reached my destination^t 2, and secured, as a 

 guide, the landlord of the unpretending little public-house, on whose pony we crossed 

 the deeply swollen beck, our first obstacle in progressing to Widdy-bank and Caldron 

 Snout, (incorrectly given Spout by Francis and Hooker). And here allow me to hint 

 to botanists who may visit this place, in search of plants the locality of which is sim- 

 ply given as Widdy-bank, to take a guide as they desire success in their search, since 

 Widdy-bank is a tract of country extending about 'three miles square, and thus a very 

 indistinct description for the locality of a small plant. We had not proceeded far when 

 we found Bartsia alpina in great abundance, principally either young plants or in seed; 

 I was however fortunate enough to secure three in flower. A little farther on, and 

 extending over a large space, was Tofieldia palustris in seed. We then saw many 

 plants of Gentiana verna, not far from the side of the river; and, mounting higher 

 ground, discovered one tuft of Carex pulicaris. The remainder of our way, until we 

 reached the Snout, was unproductive. There, growing out of the crevices of the rock 

 on the Durham side, were Festuca vivipara and Polypodium Phegopteris in great lux- 

 uriance. We crossed the stream by its narrow bridge, into the county of Westmore- 

 land, but dared not extend our ramble, in consequence of the threatening aspect of 



* In a letter to E. Newman. 



