68 HISTORY OF BRITISH FERNS. 



sheaths pale, loose, \vith 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. liyemale, Linnccus. — 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. 



var. Wilsoni. — Stems less rough, taller. 



