212 GH ditas OF TRIBES AND GENERA. 
Series 2,—Veins free. 
# Sori Indusiate. 
Sect. 9.—OREOPTEREZ. 
Sort punctiform, Jndusiwm orbicular or reniform, plane. 
111.—LasrREA, Presl. (1836). 
Polypodium sp. auct, ; Nephrodium sp., Hook. Sp. Fil. 
Vernation uniserial, sarmentose or fasciculate, erect or 
decumbent, acaulose, rarely sub-arboroid. Fronds varying 
from pinnatifid to decompound multifid, 1 to 6 feet high. 
Veins simple, ot once or several times forked, or coste- 
form and pinnate; venules free. Receptacles punctiform, 
terminal or lateral. Indusium reniform or sub-rotund, 
interiorly attached. 
Type. Aspidiwn Filiz-mas, Sw. 
Illust. Hook. and Bauer. Gen. Fil., t. 45, A. ; Hook. Brit. 
Forns, t. 15; Hook. Fil. Exot., t. 98 ; Moore Ind. Fil., 
P. 71; J. Sm. Ferns Brit. and For., fig. 75; Hook. 
Syn. Fil., t. 5, fig. 44. 
Oss.—The above character embraces a large number of - 
widely distributed species, abounding within the tropics, 
and extending to the furthest limits of Fern vegetation in 
both hemispheres, These numerous species vary greatly 
in the size and circumspection of their fronds, agreeing in 
general habit with the genus Phegopteris, the want of 
indusia in the latter being the only technical distinction, 
that organ, however, is often very small and soon becomes 
obliterated, and as stated under Nephrodium, when absent, 
the species of Lasírea are consequently placed under 
Phegopteris. The indusium varies considerably in size and- 
texture and in the depth of the sinus, the latter being 
