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 the 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.
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