68 HISTORY OF BRITISH FERNS. 
sheaths pale, loose, with acute wedge-shaped, brown- 
tipped teeth; branches erect. 
7. E. ramosum, Schleicher. —Stems similar, very rough, 
with from eight to twelve ridges, and having close 
sheaths, which ultimately become wholly black, and 
have narrow subulate teeth ; almost branchless. 
8. E. hyemale, Linnwus. —Stems similar, very rough, with 
from fourteen to twenty ridges, and having close 
whitish sheaths, banded with black at the top and 
bottom ; the teeth slender, deciduous ; almost branch¬ 
less. Plate XX. fig. 1. 
9. E. Moorii, Newman. —Stems similar, annual, rough, 
tapering, with about twelve ridges, and having loose 
striated sheaths, black at the base, white above, with 
black tips to the blunt teeth, which are tipped by 
flaccid membranous awns ; almost branchless. 
10. E. variegatum, Weber et Mohr. — Stems similar, very 
rough, with from four to ten ridges ; sheaths slightly 
enlarged, green below, black above; teeth obtuse, 
tipped by deciduous awns ; almost branchless. 
rar. Wilsoni.—Stems less rough, taller. 
