Cryptogamia , J07 
simple, erect, slightly rough. In wet and marshy places. 
Equis. Arvense, Cora Horsetail ; with barren stems, 
branched all round ; branches slightly rough, stems pro- 
ducing seed, simple. Frequent in moist meadows, and 
among corn in a wet soil. 
Equis. Hyemale, Rough Horsetail, or Shavegrass ; 
with a naked, very rough stem, slightly branched at the 
base, and terminal catkin. In marshes.and moist woods; 
and to the habitats noticed in the Flora Britannica may- 
be added, a place where water stood in the winter on 
the Newton-green near Ayr, and the banks of the Doan, 
three miles south from the same place. The dried, 
stems are much employed by cabinet-makers for polish- 
ing their work. 
Ophioglossum. Gen. c7tar.~— Spike two rowed, cap- 
sules two-valved, sunk, and opening transversely. 
Oph. Vulgatum^ Common Adder’s- tongue; with ovate 
veinless frond ; in moist meadows and pastures, but not 
very common. 
Osmunda. Gen. char.*™ -Spikes branched, capsules 
two-valved, naked, globular. 
Os. Lunaria t Common Moonwort ; with pinnated 
frond, and spike rising from the base ; the leaflets cres- 
cent-shaped, crenated. In dry pastures and meadows. 
Os. Regalis f Royal Moonwort, or Flowering Fern ; 
with frond twice pinnated, and spike produced at the 
summit; leaflets heart-shaped, lanceolate, smooth. This 
splendid plant, when in full vigour, rises to the height 
of three or four feet, and is not uncommon in marshy 
places and the crevices of rocks in the Western High- 
lands of Scotland. 
1 
