392 GENERA OF FERNS. 
sile, longitudinally bivalved, multilocular, each cell opening 
by a vertical slit on their interior side. 
Rhizoma large, globose. Fronds 4 to 8 feet long, bi-tri- 
pinnate. Pinne lanceolate, serrated. Rachis sometimes 
winged. 
Examp. 1. M. alata, Sm. 2. M. fraxinea, Sm. 3. M. sorbi- 
folia, Sw. 4. M. attenuata, Labill. 5. M. cicutzfolia, Kaulf. 
6. M. elegans, Endlich. 
Ilust. Hook. et Bauer, gen. fil. t. 26. Labill. Nov. Caled. t. 
13, 14. Schk. crypt. 1. 152. Schott, gen. fil. 24. 
Obs. This genus is discriminated from the preceding by its 
multilocular sporangium, the structure of which may readily be 
presumed as consisting of the two series or rows of sporangia 
in Angiopteris becoming connate, both laterally and oppo- 
sitely, each of the cells of the sporangium of Marattia being 
analogous to a sporangium of Angiopteris. Consequently, 
the two valves correspond to the double series. of the free 
sporangia of the latter genus. By some authors the sporangia 
of Marattia are termed sori, and the two valves indusia, but 
according to my view, neither of these appellations is ap- 
propriate in the present case. 
141. Europium, J. Sm. 
(Marattiz sp. Kaulf. Radd: 
Veins simple or forked. Venules direct, free. Sporangiferous 
receptacle medial, pedicellate! Sporangia a longitudi- 
nally bivalved, multilocular, each cell opening by a yen. 
slit on their interior side. 
Fronds tripinnate, 4 to 6 feet in Eher ultimate pinnules 
Y inch in length, sessile, articulated with the rachis, laciniate 
or dentate. Rachis winged, membranous. Sporangia usually 
ae seated on a slender pedicel which becomes decum- 
Species. M. Kaulfussii, J. Sm. (Marattia alata, Kaulf. Radd. 
non Sm.) 
Illust. Hook, gen. fil. t. 118. Radd. Bras. Fl. t.-83, 84. 
