A HISTORY OF DURHAM 



ORDER EQUISETACEJE (continued) 

 Equisetum sylvaticum, L. 



palustre, L. 



limosum, L. 



hyemale, L. 



variegatum, Schleich. 



ORDER LYCOPODIACEJE 



Lycopodium clavatum, L. 



alpinum, L. 



Selago, L. 

 ORDER SELAGINELLACE^E. 



Selaginella Selaginoides, Gray. 



MOSSES (Musct) 



The county is peculiarly rich in these plants, owing to its abundant 

 moisture and shade, and to its wonderfully varied surface. 



Two parts of the county have been particularly well worked for 

 mosses. These are Teesdale and Weardale. There is a good list of 

 workers in the former interesting dale, and some very rare plants have 

 been found. 



Other parts of the county have been dealt with only casually, and the 

 mosses found appear in the appended list. 



The rarer and more interesting are located as follows : 



Pylaisia polyantha^ discovered about Darlington as a British plant in 

 1833 (Backhouse), is not so rare in Durham as elsewhere. It has been 

 found chiefly on old hawthorn at Gainford, Coniscliffe, Mowden Lane, 

 Walworth, and also on stones at Walworth (Barnes). 



At Winston Bridge on the Durham side grows the very rare moss 

 Anomodon longifolius. Here also are Earbula sinuosa, Pottia Heimit, Tor tula 

 papillosa, Mnium stellare, Fissidens crasstpes, TLurbynchium crassineruium 

 in fruit, Eurhynchium tenellum, and Plagiothecium depression. 



At Piercebridge are found Pottia intermedia and Tortula angustata. 

 The interesting Orthotrichum pollens grows near Darlington, and the 

 pretty little Orthotrichum stramineum at Gainford and Winch Bridge. 



If we now proceed to the Tees mouth we find the flat golden tufts 

 of Tortula ruraliformis all along the sand hills among the stunted grass, 

 but in the flat sandy tracts at Snook Point we have a series of maritime 

 mosses of particular interest. They are Eryum calophyllum, Bryum 

 Warneum, Eryum /acustre, and Sivartzia inclinata, all of which also grow 

 on Coatham Marshes across the river mouth. One plant of this associa- 

 tion growing at Coatham, viz., Bryum Marratii, has not yet been found in 

 Durham, but is likely to occur. On the banks of the Tees we find 

 an abundance of mosses from Barnard Castle to the High Force, both on 

 the walls and rocks and on the trees by the roadside, the chief ones on the 

 trees being Orthotrichum Lyellii and Orthotrichum affine. Eryum uliginosum 

 grows by the roadside all the way from Barnard Castle to the High Force 

 Inn (Spruce). At Winch Bridge occur Mnium stellare and Orthotrichum 

 stramineum, and below the bridge Hypnum Sommerfeltii. At the High 

 Force among the basaltic rocks are Orthotrichum rupestre, Eartramia 

 Ha/leriana, Ceratodon conicus, Hypnum incurvatum, Trichostomum tenuirosfre, 

 and Cynodontium Eruntoni; and on the river bank close by the two varieties 

 plumulosum and plumosum of Hypnum unct'nafum, both in fruit. In the 

 small plantation close by the High Force are Ulota crispu/a, Antitrichia 

 curtipendula, Orthotrichum pulchellum, and Ulota Bruchii, the last being the 



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