WOODD: ‘THE FLORA OF A POTHOLE.’ 269 
Geum rivale, 200 ft. above its usual limit. 
Chrysosplenium oppositifolium. C. alternifolium. 
Cardamine hirsuta. 
Saxifraga hypnoides. 
Salix aurita, 300 ft. above its usual limit. 
Acer pseudo-platanus, 550 ft. above usual limit. The tree 
extends itself laterally from the side of the pothole, and is 
thus sheltered from the wind. 
Blechnum boreale. 
Nephrodium dilatatum. 
Athyrium filix-foemina, 45° ft. above its usual limit. 
Nephrodium filix-mas. 
Asplenium viride. 
Cystopteris fragilis. 
Marchantia. 
The next pothole which we visit in, addition to many, but by no 
means all, of the above plants, contains :— 
Angelica sylvestris, 450 ft. above its usual limit. 
Geranium sylvaticum, 600 ft. above its usual limit. 
Alchemilla vulgaris. 
Arabis hirsuta, 300 ft. above its usual limit. 
Lychnis diurna, 550 ft. above its usual limit. 
Crepis paludosa, 300 ft. above its usual limit. 
A third pothole adds :— 
Thymus serpyllum. 
Oxalis acetosa. 
Fragaria vesca, 300 ft. above its usual limit. 
Viola sylvatica. 
Cnicus arvensis. 
Asplenium ruta-muraria. 
Aspidium aculeatum. 
While succeeding potholes further supply :— 
Ranunculus repens, 300 ft. above its usual limit. 
Mercurialis perennis, 900 ft. above its usual limit, as assigned 
to it in the ‘Flora of West Yorkshire’ (which see). It is 
abundant in Oughtershaw wood at 1,200 ft. 
Veronica officinalis. 
Cerastium triviale. 
Sept. 1894. 
