Equisetum . ] 
FERNS. 
85 
Hab. — Eng. : Sand-hills oil the Cheshire coast, between Hoylake and the Rock 
Fort, Mr. H. C. Watson. Wardrew, Northumberland (abundant), Mr. Winch. 
Southport, Lane., Mr. W. Wilson. Near the Powder Magazine, in AVallasey, 
opposite Liverpool, Mr. J. E. Bowman. Bootle Sands, near Liverpool, Mr. 
Rylands. Near Winch Bridge, Teesdale, Mr. Bowman. — Scot. : Sands of Barry, 
Forfarshire, Dr. Greville. Near Avocli, Ross-sliire, Rev. G. Gordon. — Ire. : 
Portmarnock, opposite Baldoyle, Dr. Taylor. Mucruss, Killarney (a tall var.), 
Mr. W . Wilson. Moist banks near a waterfall at the upper end of Colin Glen, 
Belfast, Mr. Mac/cay. Ballyharrigan Glen, near Dimgiven, Mr. D. Moore. 
Geo. — S witzerland, Italy, France, Alsatia, &c. 
EQUISETUM MACKAII. 
LONG-STEMMED HORSE-TAIL. 
(Suppl. Plate, fig. 0.) 
Cha. — Stem simple or very slightly branched, very rough, with 
8—12 grooves. Sheaths appressed, finally black all over, teeth 
slender, persistent. 
Syn. — E quisetum elongatum, Hook., Br. FI., 5 ed. 
Fig. — Newman, British Ferns, 2d ed. p. 15. Phytologist. 
Des. — Stem 1 to 3 feet high, simple or with solitary distant 
branches. Catkins with a point. Sheaths cylindrical, at first pale 
green with a black band below the teeth, finally all black. 
Hab. — Mountain Glens, near Belfast, F. Whittle, Esq., and Dr. Mackay. 
North of Ireland. River Dee, Scotland. 
Geo. — The synonymy of this species not being quite settled, its foreign distri- 
bution cannot he stated with certainty. 
8.— EQUISETUM IIYEMALE. 
ROUGH HORSE-TAIL. SHAVE GRASS. DUTCH RUSH. 
(Plate IX, fig. 8.) 
Cha. — Stem erect, rough, deeply striated with 14 — 20 grooves. 
Sheaths short, appressed, white in the middle, black at each end. 
Teeth deciduous. 
Syn. — Equisetum hyemale, Linn., W r illd., Smith, Hook., Light/., Ehrh., Iiuds., 
With., Pursh, Mack., Gray. (Not of Bory.) — Equisetum nudum, Ray, 
Gerard. 
Fig. — E. B. 915. — Hook, in Flo. Lon. 161. — Ger. Her. 1113. — Bolt. 39. — 
Schk.fil. 172. 
Des. — Rootstock black, branched. Stems erect, of a very dark 
green, without whorls of branches, but forked and divided at the 
base, 2 to 3 feet high, regularly and numerously furrowed. Sheaths 
2 to 3 inches distant from each other, very closely pressed to the 
stem, short, with a black rim at the top and bottom of each. Teeth 
of the scales black and deciduous. 
It is surprising that this plant, so valuable in a general as well as a commercial 
