( 3 ° ) 
Height. From six inches to two feet. 
Colour. Bright green. 
Habitats. Clefts in limestone rocks in the north of 
England. 
(See also page 54.) 
GROUP I; GENUS X; SPECIES VII. 
LASTREA SPINULOSA. (Narrozv prickly-toothed Fern.) 
Plate XI. 
Fronds. Lanceolate, rather narrow, bi-pinnate. 
Pinnae triangular, tapering, rather distant. 
Pinnules oblong, deeply lobed; the larger 
ones pinnatifkl. Margins serrated and spiny. 
Stipes about as long as the leafy portion of 
the frond, and clothed with oval, pale brown 
scales. The surface of the frond is flat. 
Growth. Erect. Fronds rising from crowns, several 
of which are connected together by a branch¬ 
ing rhizoma. 
Height. From one foot to three feet. 
Colour. Light, yellowish-green 
Habitats. Damp woods and marshes. Generally 
distributed, but rarer in the northern counties. 
[See also page 54 .) 
