1240 BENGAL PLANTS. [Alsophila. 
Fronds all similar, grassy Vittaria. 
on dimorp ic 
| Veins freely Nee all soriferous [p. 1239) Hemionitis. 
§Sori not confined to the veins but spread over saat pba under 
surface of the fertile frond - 1239] ostichum. 
4126. Alsophila R. Br. 
Tree ferns, with tall caudex; fronds decompoundly oe ( 
veins simple, forked or pinnate, not anastomosing. Sori globose, 
dorsal, on a vein or at the forking of a vein; sporangia cae 
often compact, generally on an elevated receptacle, often villous, 
obovate, with a broad, vertical or suboblique, elastic ring ; industwum 
absent. 
Segments of fronds subfalcate, linear-oblong, entire or distantly crenate, 
when fertile often contracted ; veins forked and often 3-branche 
glauca. 
Segments of fronds triangular or rounded, rarely ovate, serrate ; veins all 
simple ..glabr 
2743. AusopHina GLauca J. Sm.; F. I. C. 12. 
Chittagong. 
A lofty tree-fern. 
2744. ALsopHina GLABRA Hook.; F. I. C. 14. 
ota Nagpur; Chittagong. 
A tall tree-fern. 
1127. Trichomanes Smith. 
Small, often minute herbs, growing on moist tree-trunks and 
rocks; caudex often long, filiform, creeping; fronds delicately 
membranous, simple or co ee costate; veins simple oF 
branching, never anastomosing. Sori marginal, always terminatin 
& vein, more or less sunk in the ae ; indusium tubular, like the 
frond in texture, the mouth truncate or winged, or faintly 2- lipped; 
receptacle pet elongate, often considerably exserted beyond 
the mouth of the indusium ; sporangia confined nearly to the base 
of the ss orbicular, imbricate, subpeltate, compressed, 
surrounded by a complete biniecnies ring, and opening vertically. 
Caudex a wide-creeping, slender, tomentose rhizome ......... pyxidiferum. 
Caudex tufted with strong, wiry roots seseeeeGavanicum. 
