276 HISTORY OF BRITISH FERNS. 
Equisetum Moorei, Newman. 
Mr. Moores Rough Horsetail. 
This plant differs from the other native unbranched 
Horsetails in the nature of its stems, which are not per¬ 
sistent through the winter, or evergreen as they are, but 
die down in autumn, and are renewed in spring ; they are 
therefore annual. They grow from a foot to two feet and a 
half high, and are unbranched, except where the apex has 
been destroyed, in which case branches are sparingly pro¬ 
duced. They are rough, and are channelled with about 
twelve deep well-marked furrows. The sheaths which are 
loose, and have the same number of ridges as the stem, 
are whitish, with a black ring at the base, and tipped by 
about twelve blackish teeth, which are rigid, bluntish, and 
terminated by elongated membranous paler awns. The 
fructification consists of a cone, formed of about three 
dozen black roundish scales, and terminated by a conical 
acuminate apex. 
This plant was found in the year 1851, by Mr. D. 
Moore, the indefatigable Curator of the Eoyal Botanic 
Gardens at Glasnevin, Dublin. It was growing on banks 
facing the sea at Boekfield, in the county of Wicklow. 
