GENERA OF FERNS. 391 
Div. V. Mararriacea. Kaulf 
Sporangia sessile, rarely pedicellate, horny, opaque, dis- 
tinct and unilocular, or laterally and oppositely connate, 
forming a multilocular, round, oblong or linear, biserial or 
bivalved, compound sporangium; opening by pores or ver- 
tical slits on the interior side. 
Obs. This remarkable division of Ferns contains a few 
more species than Osmundacee, from which it is distinguish- 
able by its usually connate multilocular sporangia, while in 
Angiopteris the sporangia are free and unilocular. Neverthe- 
less, habit and other affinities of structure tend to prove that 
this is the proper station for that genus. 
139. ANGIOPTERIS, Hoffm. 
(Clementea, Cav.) 
Veins simple or forked. Venules direct, free. Sporangi- 
ferous receptacle medial, linear, fimbriate. Sporangia obovate, 
emarginate, sessile, opening by a vertical slit on their interior 
side, (10-12), definitely disposed in two opposite rows. 
Fronds 6 /o 10 feet in length, stipitate, bipinnate. Pinne 
linear-lanceolate, serrate at the apex. Sporangia laterally 
confluent, forming a continuous transverse, submarginal, broad, 
compound sorus. 
Species. A. evecta. Hoffm. (Clementea palmiformis. Cav.) 
Iilust. Hook. et Bauer, gen. fil. t. 10. Sow et Grev. ic. fi. 
t. 36. 
Obs. Authors have described more than one species be- 
longing to this genus; but from my observation I believe 
that the specimens, from various localities, are only slight va- 
riations of one species. 
10. Mararria, Sm. 
(Myriotheca, Bory.) 
Veins forked. Venules direct, free. Sporangiferous recep- 
tacle subterminal, oblong, fimbriate. Sporangia oblong, ses- 
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