Mr. R. Spruce on the Musci mid Hepaticse of Teesdale. 271 



XXXV. — The Musci and Hepaticse of Teesdale. By Richard 

 Spruce, Esq., F.B.S. 



[Concluded from p. 203.] 



41. Ceratodon purpureus, Brid. (Didymodon, H. and T.) Fre- 

 quent. 



42. Cinclidotus fontinaloides, Beauv. In the Tees. 



43. Climacium dendroides, W. and M. (Hypnum dendroides, 

 Dillen.', Linn.; H. and T. Leskea, Hedw.) Common. 



44. Dicranum Dillenii, Tayl. MSS. (D. scoparium a. vulgaris. 

 Muse. Brit.) Heaths and rocks ; fruiting abundantly in Holwick 

 Wood. 



45. — flavescens, Sm. Sides of streams, frequent. 



46. — flexuosum, Hedw. Heaths and moist rocks. 



47. — fulvellum, Sm. On stones near springs, between the base 

 of Cronkley Scarr and the river : fruit very scarce. 



48. — fuscescens, Turn. Muse. Hibern. p. 60; Engl. Bot. 1. 1490. 

 D. Sphagni, Wahl. (D. scoparium y. Hook, in Engl. Flora.) 



On basaltic rocks below the High Force, Holwick Scarr and other 

 places, but existing in the greatest abundance and perfection on 

 Cronkley Scarr. 



Dr. Taylor has well distinguished between D. scoparium, Hedw., 

 and D. Dillenii, and I do not hesitate to assert that the D. fas- 

 cescens of Turner is equally distinct from both. In Teesdale, 

 where D. Dillenii and fuscescens grow together on the same rocks, 

 the difference in habit is so striking, that I am surprised any one 

 should ever have thought of uniting them. The latter I would 

 separate from the former by the following characters : — 



Tufts more dense, darker-coloured, deep green above, fusces- 

 cent below. Leaves secund or subsecund, slightly twisted in dry- 

 ing, lanceolate, tapering into a very long and slender acumina- 

 tion ; nerve much thicker, in the upper half usually exceeding the 

 breadth of the pagina on each side, which is not the case at all 

 in D. Dillenii * ; reticulation far smaller, punctate in the upper 

 portion of the leaf (the cellules being nearly equal in length and 

 breadth), which is never the case in D. Dillenii (where the length 

 of the cellules always much exceeds their breadth). The peri- 

 cfkBtial leaves have broad sheathing bases (usually extending a 

 very little above the vaginula), but are widely spreading upwards; 

 whereas in D. Dillenii the inner perichsetial leaves are remarkably 

 convolute, broadly elliptical, with linear squarrose apiculif, and 

 the sheath which they form is above twice the length of the vagi- 



* In Z>. Dillenii the nerve has 3 — 5 dorsal ribs, the middle one of which 

 is serrated near the summit and sometimes expanded into a lamina ; but in 

 D. fuscescens the nerve has only one rib at the back, which is serrated and 

 extends a very little way below the summit of the leaf. 



f The stem-leaves of Hypnum piliferum are very similar in form. 



