CHARACTERS OF TRIBES AND GENERA. 157 



crossing the angular junctions of the venules, thus forming 

 compital linear sori. The species are entirely Indian and 

 Malayan, L. lanceolata being found in Mauritius and 

 Bourbon. On account of the variations of size and texture, 

 consequent on localities, about a dozen specific names have 

 been applied to them, but the whole seems to resolve into 

 a few species, of which the following are examples. 



In the " Species Filicum " the species of Loxogramma 

 form part of the genus Gymnogramma, but they have no 

 character in common with them except the oblique linear 

 naked sori. 



Sp. L. lanceolata, Sw. ; L. involuta, Don. (Grammitis 

 flavescens, Wall. ; G. mavrophylla, Wall. ; G. acuminata, 

 Wall.) ; L. advena, El. ; L. coriacea, Pr. 



SERIES 2. Veins free. 



Sect. 2. GYMNOGRAMMA^. 



Veins generally forked, nearly their whole length occu- 

 pied by the sporangia, forming forked, linear, naked sori, 

 which are often confluent. 



70. GYMNOGRAMMA, Desv., in part (1811). 

 Hook. sp. Fil.j in part. 



Vernation fasciculate, erect, acaulose, in some becoming 

 csespitose. Fronds varying from entire to decompound 

 multifid, and from a few inches to 2 to 3 feet in length, or 

 their apex continuous, indefinite, and climbing, smooth, 

 villose, squamose, or farinose. Veins forked, venules free, 

 generally sporangiferous their whole length, forming linear 

 sori, which are often confluent, naked. 



Type. Acrostichum calomelanos, Linn. 



