OVER THE HILLS OF THE NORTH OF ENGLAND. 267 



86. Mdlca nutans. Unknown in the Porphyry. Widely soread 

 throuj>'h each of tlie tliree other tracts in the Agrarian region. 



87. Foa alpiua. Unknown in the Porphyritic, Carboniferous, and 

 Oolitic tracts. In the Slate district in one place on llelvellyn. 



88. Festuca sylvatica. Unknown in the Oolite and Porphyry. In the 

 Carboniferous tract in one station, and in the Slate tract in three or four, 

 all in the Midagrarian zone. 



89. TFoodula ilocnsis. Unknown in the Porphyry and Oolite. In one 

 station in the Carboniferous, and in four or five in the Slate district. 



90. Polijpodinni Phecjopteris. Widely dispersed through all the four, 

 ranges both horizontally and vertically, reaching 800 yards in the Lakes. 



91. P. Drt/opteris. Dispersion just like that of the last, reaching 700 

 yards in Teesdale. 



92. Allosonis crlspiis. Pound in all the four ranges, but very rare in 

 the Oolite, and specially abundant in the Slate, where it is dispersed 

 universally horizontally, and climbs vertically from the Lake sides to the 

 highest peaks. 



93. As/jidiii)u Lonch'Uis. Unknown in the Porphyry and Oolite. One 

 station in the Carboniferous tract in Teesdale, and three or four have 

 been ascertained in the Slate range. 



94. Asplenium, vlr'ule. Known in all the four ranges, but very rare in 

 the Oolite and Porphyry. Commonest in the Carboniferous tract on the 

 limestone scars, ascending to 800 yards. 



95. A. septeidrioHale. Unknown in the Porphyritic, Oolitic, and Car- 

 boniferous tracts. In several stations in the Slate district in the Mid- 

 agrarian and Superagrarian zones. 



96. Lijcopodium annot'mmri. Unknown in the Porphyritic, Oolitic, and 

 Carboniferous tracts. In the Slate district, plentiful on one hill only 

 (Bowfell). 



97. Lycopodium alpiiucm. Widely dispersed tlu'ough all tiie four 

 ranges, ascending to 1000 yards on Skiddaw. 



98. L. selaginoides. Similar to the last in its dispersion, ascending to 

 900 yards on Helvellyn. 



99. Isoetes lacustris. In the Slate district plentiful in all the large 

 lakes, and occurring also in most of the tarns. Quite unknown in the 

 three other ranges. 



100. Eqiiisetum umhrosum. In Teesdale, along ten miles of the river, 

 principally in the Superagrarian zone. Not known in the other three 

 ranges. 



101. E. hyemale. Unknown in the Porphyry. Scattered sparingly in 

 the other three districts, but not known above the Midagrarian zone. 



102. E. varmjattim. In Teesdale over a range of from 250 to 500 

 yards. In the Slate district reported by Winch from a single station. 

 Not known in the Porphyritic and Oolitic ranges. 



The occurrence or absence of the species in each range will be shown 

 most clearly by the table on page 268. 



In looking over the lists, the following comments of a general character 

 suggest themselves : — ' 



1. With regard to the Porphyritic tract, the paucity of Montane plants, 

 as counted both by species and individuals, is remarkable when we con- 

 sider the area that it occupies ami the height to which it reaches, and that 

 it is considerably more northern in position than the other three ranges. 



