$n which du differ in pras pinnate fronds, and 
the pinnæ articulate with the rachis, these differences 
induce me to consider them as forming a transition genus. 
= Sp. P. Burkeana (Hook. Sp. Fil., 2, t. 196, B.) ; P. arti- 
culata (Hook. Sp. Fil., 2, t. 196, A.). 
The first is a native of South Africa, and the latter of 
Mauritius, Borbon, and Madagascar. 
165.—LrropRocua, Presl. (1836). 
Pteris. sp. auct., Hook. Sp. Fil. 
Vernation fasciculate, erect or decumbent, often ceespitose. 
Fronds pinnate or bi-tripinnate, decompound, deltoid, 1 to 
10 feet or more in height; ultimate segments broad and. 
often unequally lobed. Veins evident; venules wholly or 
partially anastomosing, forming unequal areoles, the ex- 
terior venules sometimes free. Sporangiferous receptacles 
linear, transverse marginal, seated in the axis of an inflex 
special indusium. 
Type. Pteris comans, Forst. 
Must. Hook. and Bauer Gen. Fil., t. 65 B. ; Moore In : 
Fil, p. 32; J. Sm. Ferns, Brit. and For., fig. 97; 
Hook. Syn. Fi, t. 8, fig. 31h. — 
Ozs.—In habit the species of this genus are similar in 
general appearance to those of the following genus Pteris, 
but are technically distinguished by their anastomose vena 
tion. 
The species vary greatly in size, in the circumscrip 
. Of the fronds, and in their mode of growth ; occasionally, 
. indeed, separate parts of a single frond differ so widely tha 
in the herbarium they are apt to be viewed as distinct 
species. 
In the “ Species Filicum” thirty-nine species are 
