20 
SYNOPSIS OF THE GENERA. 
distinct, subterminal, longitudinally two-valved, the valves laterally connate, containing 6-12 cells, 
opening by a vertical internal slit ; receptacle subterminal. 
94. Eupodium, J. Smith . — Vems simple or forked, venules direct, free. Spore-cases large, oblong, 
multilocular, seated on slender stalks, longitudinally two-valved, the valves laterally connate, contain- 
ing 5-8 cells opening by a vertical slit inside ; receptaele medial. 
95. Angiopteris, Hojfman.-r- Veins simple or forked ; venules direct, free. Sori linear, continuous, 
compound ; sptore-cases obovate, emarginate, sessile, laterally confluent, arranged in opposite series of 
5-7 cells, the cells opening by a vertical internal sUt ; receptacle medial. 
96. Dan^a, Smith. — Veins forked ; venules direct, parallel, arcuate on their apices, anastomosing 
with the cartilaginous margin. Spore-eases linear, biserial, multilocular, each cell opening by a cir- 
cular pore ; receptacle occupying the whole length of the venules. — Fertile fronds usually contracted. 
OPHIOGLOSSACE..®, Presl. — Spore-cases sessile, roundish or suhylobose, opening hy a transverse 
fissure (bivalved), opaque, ivithouta ring or reticulation. 
97. Botrychium, Swartz. — Fronds two-branched, the fertile branch erect, contracted, constituting 
a compound sporangiferous unilateral panicle. Veins simple or forked, radiating; venules direct, free. 
Spore-cases globose, distinct. 
98. Ophioglossum, Linneeus. — Fronds two-branched, the sterile portion spreading, usually shorter 
than the erect fertile spike. Veins (sterile) uniform, reticulated, forming elongated areoles. Spore- 
cases roundish, connate in two parallel rows into a simple compact spike. 
FERN CASE, 
