196 
FERNS : BRITISH AND FOREIGN. 
tifid. Veins costseform, pinnate ; venules anastomosing, forming 
irregular hexagonoid areoles. Sporangia produced on the 
apices of 4 — 5 venules, converging in the sinus of the lacinise, 
forming an arcuate sorus in each sinus. Indusium linear, 
lunulate. 
1. L. Lindeniana, Hoolc. Sp. Fit. 2, t. 89 A.— Tropical 
America. 
2. L. pubescens, Willd. ; Hook. Gen. Fil. t. 68 A . — 
Mauritius. 
Tribe VIIL— BLECHNE.®. 
Sori intramarginal, medial or costal, transverse oblong linear, 
continuous or interrupted. Indusium lateral, linear, exteriorly 
attached, plane or vaulted, rarely obsolete. Fronds uniform, or 
the fertile contracted. 
100. BLECHNUM, Linn. ; Presl. 
Vernation fasciculate, erect, caudiciform or casspitose. 
Fronds simple, pinnatifid or pinnate, from a few inches to 4-6 
feet high ; pinna; adherent or articulated with the rachis. Veins 
forked ; the sterile venules free, or their apices thickened and 
forming a cartilaginous margin ; the fertile veins combined near 
their base by a transverse, continuous, sporangiferous receptacle, 
constituting a linear, costal, or rarely extra-costal sorus. Indu- 
sium linear, plane. 
* Apices of the venules free. 
f Sori costal. (Blechnum, Fresh) 
1. B. Lanceola, Sw. ; Lodd. Cab. (1592) ; Hook. Lot. Hag. 
t. 3240 ; Kunze, Fil. t. 57,/. 1 ; Hook. Ic. PI. t. 970. 
B. lanceolatum, Eadd. Fil. Eras. t. 60, /. 3. B. tri- 
foliatum, Kaulf. — Brazil. 
2. B. polypodioides, Eadd. Fil. Eras. t. 60, f. 2; Kunze, 
Fil. t. 58, /. 1 ; Lowe's Ferns, 4, t. 34. — Brazil. 
