SOME NIDDERDALE MOSSES. 
LLEWELLYN J. COCKS, 
Godolphin House, Harrogate. 
Tue following notes of observations made in this district during the 
past eighteen months will, I hope, be of interest to bryologists. 
The localities mentioned all fall within the Nidd drainage. 
Anisothecium crispum Lindb. (Dicranella Schrebert Schimp.) 
i bog at the foot of Birk Crag, Harrogate, and its 
variety e/atum (Schimp.) in a swampy field on Oak Beck Farm 
near. 
Seligeria Donii C. M. and S, setacea Lindb. are both abundant 
on rocks by the Nidd at Bilton Banks. (My friend Mr. R. 
Barnes has recently found the much rarer S. /ri/arta Lindb. on 
the limestone in Upper Nidderdale, a district which I have not 
yet visited. His keen eye has detected the same plant in 
Swaledale and Wensleydale.) 
Phascum curvicolle and Pottia recta are both frequent on the 
ground in disused magnesian limestone quarries in the Knares- . 
borough district. 
Tortula marginata Spruce is on rocks near the Dropping Well, 
Knaresborough. 
Tortula angustata Wils. On hedge-banks in Bilton Park. (A 
very pretty moss, and quite distinct from 7: subulata.) Both 
these Tortule are previously unrecorded for West Yorks. 
Mollia tenuis Lindb. (Gymnostomum tenue Schrad., plur. auct.) is 
by no means uncommon on the magnesian limestone. It is 
particularly fine in Nidd Rock Quarry, near Ripley. 
ollia calcarea Lindb. (Gymnostomum calcareum Nees and 
Hornsch., Schp. Syn.) I have recently gathered at Knares- 
borough. This is now first recorded for Yorkshire. It is very 
rare in Britain, having been found only in Derbyshire and 
Scotland. 
Mollia tenuirostris (Hook. Tay!.) Lindb. (Didymodon cylindricus 
Br. Sch.) occurs sparingly at Bilton Banks. 
Barbula revoluta (Schrad.) Brid.—unaccountably described as 
‘rare’ in ‘The Flora of West Yorkshire’—is plentiful in the 
limestone districts and on the mortar of walls off the limestone. 
It covers the rocky sides of Knaresborough Railway Station. 
Schistostega osmundacea Mobr. still flourishes in great luxuri- 
3 See in the abandoned sandstone quarries at Guy's Cliff, 
1897. 
