499 GENERA OF FERNS. 
98. SCHIZOLOMA, Gaud. J. Sm. 
(Lindsee sp. Dry. Lab. Sw. Kaulf. Pteridis sp. Auct.). 
Costa central Veins forked. Venules anastomosing, 
forming elongated oblique areoles, transversely combined at 
the margin by a continuous sporangiferous receptacle. Spe- 
cial indusium linear, usually equal with the plane indusiiform 
margin. Sporangia vertical, rarely spreading. 
Fronds simple, cordate, trifid or pinnate, rarely bipinnate ; 
` pinne /inear-lanceolate, or ovate-oblong, entire, smooth, fertile 
en both margins, not articulated with the rachis. 
Examp. 1. S. cordatum Gaud. 2. S. lanceolatum Lab. 
3. S. ensifolium (Sw.) (Pteris stricta, Lam. P. angulata, 
Presl. P. angustata, Wall.) 4. S. heterophyllum (Dry.). 
5. S. macrophyllum, (Kaui/f.). 6. S. Guerinianum, Gaud. 
Iilust. Gaud. in Frey. Voy. t. 16, = 18. Hook. et Grev. 
Ic. Fil. t.111. Hook. Gen. Fil. t. 63. 
Obs. The reticulated venation SE this genus from 
the preceding, and also from diuine: under which the spe- 
cies were originally placed. 
99. Dicrvoxipeniuw, Hook. 
Costa central, venation nearly uniform, compound, anasto- 
the areoles. Sporangiferous receptacle continuous. Indusium 
linear, nearly equal with the indusiiform margin, constituting 
a linear continuous sorus. Sporangia stipitate. 
Fronds cespitose, simple, entire, smooth, linear-lanceolate, 
attenuated and decurrent on the stipes, from 2 to 3 feet in 
length, and 2 to 2% inches in width, the fertile usually con- 
tracted and linear ; costa prominent, venation internal. Sori 
occupying both margins of contracted fronds. 
Species. D. Panamense, Hook. 
Illust. Hook. Gen. Fil. t. 62. 
Obs. Sir W. J. Hooker was the first to describe this rare 
fern, from specimens collected by Mr. Cuming in the isthmus 
of Panama, and which specimens I have been kindly per- 
