196 FERNS: BRITISH AND FOREIGN. 



tifid. Veins costaeform, pinnate ; venules anastomosing, forming 

 irregular hexagonoid areoles. Sporangia produced on the 

 apices of 4-5 venules, converging in the sinus of the laciniae, 

 forming an arcuate sorus in each sinus. Indusium linear, 

 lunulate. 



1. L. Lindeniana, Hook. 8p. Fil 2, t. 89 .4. Tropical 



America. 



2. L. pubescens, Willd. ; Hook. Gen. Fil. t. 68 A. 



Mauritius. 



TRIBE VIIL BLECHNE^l. 



8ori 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 csespitose. 

 Fronds simple, pinnatifid or pinnate, from a few inches to 46 

 feet high ; pinnae 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, Presl.) 



1. B. Lanceola, 8w. ; Lodd. Cab. (1592) ; Hook. Bot. Mag. 



t. 3240 ; Kunze, Fil. t. 57, /. 1 ; Hook. Ic. PI. t. 970. 

 B. lanceolatum, Eadd. Fil. Bras., t. 60, /. 3. B. tri- 

 foliatum, Kaulf. Brazil. 



2. B. polypodioides, Eadd. Fil. Bras. t. 60, /. 2; Kunze, 



Fil t. 58, /. 1 ; Lowe's Ferns, 4, t. 34. Brazil. 



