( i5 ) 
GROUP I; GENUS V. 
BLECHNUM. 
Sori. Form a continuous line parallel to the mid¬ 
vein, and midway between it and the margin 
of the pinna. Indusium continuous, opening 
towards the centre of the pinna. 
Venules. Free. 
GROUP I; GENUS V; SPECIES I. 
BLECHNUM BOREALE. (Hard Bern.) 
Plate II. 
Fronds. Fertile and barren fronds dissimilar; linear- 
lanceolate. Fertile fronds the taller of the 
two, and pinnate; pinnae linear-lanceolate, 
and contracted in width, the lower ones being 
only rudimentary projections. Barren fronds 
deeply pinnatifid ; lobes rounded and smooth 
on edge. Stipes short and green in the barren, 
and rather long and dark in the fertile fronds ; 
scaly at base. 
Growth. Fertile fronds very erect; barren fronds 
nearly prostrate. 
