( i6 ) 
Height. Fertile fronds from one foot to two feet. 
Barren fronds about half that height. 
Colour. Dull green. 
Habitats. Common in damp heathy situations. 
GROUP I; GENUS VI. 
CETERACH. 
Sori. Oblong, and usually attached to that side of 
the venules which is furthest from the margin 
of the frond. Indusium in mature fronds re¬ 
presented by a scarcely perceptible, erect, 
membranous ridge just behind the sorus ; but 
more evident in very young fronds. 
Venules. Anastomosing. 
GROUP I; GENUS VI; SPECIES I. 
CETERACH OFFICINARUM. (Scaly Splccnwort.) 
Plate VII. 
Fronds. Linear, deeply pinnatifid, thick and fleshy. 
Lobes alternate. The whole of the back of 
