THE FLORA OF HALIFAX. 157 



This moss grows head downward when on the underside of 

 a projecting rock. 



POLYTRICHACEJE. 



Catherinea undulata, (L) Web. and Mohr. (Bryum L. ; 

 Atrichum P.B.) 



1775. J.Bolton; under Bryum. 



Banks in woods near Todmorden. — Hevb. Nwl. and 

 Herb. Leyl. 



More or less common throughout the parish, except on the 

 higher moorlands. It flourishes best by streams but may 

 be found on moist banks in woods and lanes, borders of poor 

 fields, etc., on the hill sides. A few of the places where 

 it has been gathered are Hebden Valley, Crimsworth 

 Dean, /. Needham ; road-side, Harley Wood, Stansfield, 

 H. T. Soppitt ; Luddenden Dean; High-lee Clough, 

 Barkisland ; road-side below North Dean Wood ; 

 Norland ; Sun Wood, Shelf ; Elland Park Wood ; Butts 

 Clough, Rish worth ! 



Catherinea crispa, James. (Atrichum laxifolium, Wils. M.S. 

 Atrichum crispum, Sull.) 



W 7 et stones by the sides of streams near Todmorden. — 

 Hevb. Nwl. 



1862. Discovered near Todmorden by J. Nowell. — 

 M. & C. Fl. 



Keb Clough, Todmorden, Nowell, i860 ; several places near 

 Hebden Bridge. — Hunt and Hobkirk ; Brit. Moss Fl. 



1888. Todmorden. — A. Stansfield ; Lees Fl. 



Though considered a rare moss in many districts it is very 

 abundant along the course of the Calder and tributaries 

 above Mytholmroyd. It gradually decreases in quantity 

 as the doughs open out on to the moorlands. At the foot 

 of Paddock Beck, about a mile above the Crimsworth 

 Dean Falls, it ceases suddenly, but follows the other fork 

 of the stream (Grain Water) a little higher. It ceases 

 in Spa Clough, Booth Dean, at 11 50 feet. It confines 

 itself to stream courses, appropriating the little sand-banks 

 on the sides, and is often seen in mid-stream between 

 sand-bedded boulders. It has also been noticed in a 

 great sheet on the dam-stones below Wade Wood. It 

 may be known at a good distance by its closely packed, 



