CHARACTERS OF TRIBES AND GENERA. 149 
no other point of relationship with that genus, its whole 
habit and structure resembling Goniopteris and Stegno- 
gramma, while from Meniscium it is distinguished only by 
the more zig-zag anastomosing of the venules. Although 
it thus differs from these genera only in degree, I never- 
theless think it desirable to adopt it as a genus. 
Sp. D. Griffithii, Moore, Bedd. F. Brit. Ind. pl. 150; 
D. Wilfordi, J. Sm. (Hook. Fil. Exot., t. 93). 
These two species are very local, the first being a native 
of Assam, the other of Formosa. 
Tribe 8.—GRAMMITIDEA (Plate 8). 
Fronds varying from simple to decompound multifid, and 
from a few inches to several feet in height. Veins free or 
anastomosing. Sori linear, free or united, discal ; sporangia 
superficial or immersed in grooves, naked or included under ` 
an universal indusium. E 
Oss.—According to the “Synopsis Filicum " this tribe, 
as restricted by me, contains about one hundred species, 
the greater number being represented by the genus Gymno- 
gramma. In some genera of the section Cryptogramma the 
sori are very short and even, nearly punctiform; the 
reasons for retaining such in this tribe are specially notified. 
under the genera of that section. 
Grammitidee is represented in all Fern regions, meet 
= within or near the tropics. 
Series 1.—Veins anastomosing in various ways. 5 
Sect, 1.—HEMIONITIDE£. 
Venation uniform, reticulated, or the venules parallel and 
. angularly anastomosing, near to, or at the margin only. 
Sori equally reticulate or connected on or next the margin. 
