152 J» SMITH ON THE GENERA OF FERNS. 



Fronds pinnate, smooth; fertile pinnae, linear, entire, or pin- 

 natijid, smooth. 



Species. l.O. corcovadensis, Radd. 2. O. cervina, PresL 

 (Polyboirya, Kaidf.) Illust. Schott. Gen. FiL t. 6. Hook, et 

 Grev. Ic. FiL t. S\. 



Obs. Agrees with Polybotrya in the character of its fertile 

 fronds, but differing in habit, and also in venation; the 

 marginal vein or border readily distinguishes it from Elapho- 

 glossum, with which it has some affinity in the sterile pinnae, 

 being analogous in form and texture to the simple fronds of 

 Elaphoglossum. 



43. AcROSTiCHUM, Linn. J. Sm. 



Fgna^jon uniform, reticulated, forming elongated areoles; 

 sporangia universal on the under side. 



Fronds simple, entire, or pinnate, smooth, coriaceous, rarely 

 membraneous or squamose; the whole or the upper part only^ 

 of the fertile frond sporangiferous. 



Examp. ]. A. citrifolium, Linn. 2. A. crinitum, Sw. 3. 

 A. reticulatum, iuawT/C 4. A. obliquum, iJ/Mwe. 5. A. aureuni) 

 lAnn. Illust. Hook, et Grev. Ic. FiL t. 1. Blume, FL Jav. 

 t. 9, 16, 17. 



Obs. Acrosticmtm citrifolium of Linn, agrees in habit and 

 venation with Antrophyim, but differs from that genus, as 

 also from the other species of Acrosfichum, by the sporangia 

 being irregularly and sparingly disposed over the under side 

 of the frond, generally in small groups, without regard to the 

 veins; but although peculiar in that respect, still I cannot at 

 present find sufficient character to induce me to place it 

 otherwise than in the present genus. 



44. LOMAGRAMMA, J. Sm. 



Venation uniform, reticulated, forming nearly equal hexa- 

 gonal areoles. Sporangiferous receptacle amorphous, con- 

 stituting an elongated continuous broad marginal sorus. 



Fronds 2 to 3 feet high, pinnate; pinnaa linear, lanceo- 

 late, four to six inches long, sessile and artictdated icith the ra- 



