288 CHARACTERS OF TRIBES AND GENERA. 
Tribe 21.—PTERIDEJZE (Plate 21). 
Fronds varying from simple, entire, to decompound mul. 
tifid, and from 1 to 10 or more feet in height, and (with 
the exception of Doryopteris) of a thin flaccid texture. Veins 
free or anastomosing, their apices combined forming a 
_ transverse, marginal, sporangiferous receptacle, seated in 
the axis of an exteriorly attached inflexed special indusium 
forming oblong or continuous marginal sori. 
Oss.—I have already explained under Cheilanthee my 
reasons for separating it from Pteridee, which as now 
restricted contains about one hundred described species of 
which the genera Pteris and Litobrochia contain the principal, 
which technically differ in the venation of the first being 
free and in the second anastomosed in various ways. 
Sect. 1.—Veins anastomosing. 
163.—Doryorreris, J. Sm. (1841). 
Pieris sp. auct., sect. Litrobrochia, Hook. Sp. Fil. 
Vernation fasciculate, erect, rarely sarmentose. Fronds 
simple, cordate-hastate, or palmately-lobed ; pinnae entire 
or lobed, smooth, opaque, castaneous, stipes and rachis often- 
ebeneous, Veins internal, reticulated. Receptacles trans- 
verse marginal, seated in a narrow exterior attached : 
. indusium, forming a linear continuous sorus. : 
Type. Pteris pedata, Linn. 
Illust. Hook. and Bauer Gen. Fil., t. 65, B.: Hook. Fil 
Exot., t. 34; J. Sm. Ferns Brit. and For., fig. 98. 2: 
. Oss.—This is a small group of pretty Ferns, with the 
same general character as regards texture, colour, and 
smoothness as Pella and Cassebeera, but technically distin 
