but the same feature may be observed in some oy 7” Brongniart him- 
self. 
6. Pecorreris UNDULATA. Pi. ‘1, figs. 1,1 a. (Nos. 83 and 118 of col- 
lection.) - 
Description. Pee bipinnate; oe slender; pinne: long, slightly La 
lique to the rachis, opposite and alternate; pinnules oblique, oval-ovat 
broad at the base, and the lower saed ‘sometime s lobed, »gradually Decoaiitis 
e pinne. oe. 
- The pinnules have often an apparently continuous smooth outline; but, 
“on closer inati appear undulated, or indented eg margin; 
and many of them are. Spricullg so. 
: ag 7- Pacorrznis UNDULATA ; var. Pl. 1, figs. 2, 2a, 25, (No. 78 of dele. 
: a 
cserstion. —Frond bi ipinnate ; rachis slender ; ; pinne numerous, long, 
and gradually tapering, oblique to the rachis; pinnules oval-ovate, broad 
at base; midrib evanescent; nervules strong bifurcating towards the apex; 
“margins lobed or indented, particularly i in those near the base of the pinne. 
his species may be regarded as a variety of the last, though the pin-_ 
nules are longer and less broad. proportionally ; — the general aspect is 
similar, and the habit ae ee plant precisely the sam 
The specimen fig. 2 only be regarded as an suiting variety of the 
* ieee which is "appressed | in betee of the enlarged pinnuled, a as 
bc PTERIS @) nox torrenoiDEs Pl. 1, ‘ies. 3 and 4. (Nos. 78 and 
11 Sof realéetions) 
cae -aiccaitaeae iu Pied long si ener secondary. 
ules. 
The arrangement of the eaanales and nl in bie Bas dm re- 
minds one of the Odontopteris Schlotheimii, Brong. Hist. . a 
Sic cies t. 78, fig. 5—a fossil fern of the Pennsylvania coal measures ; but this 
: tia 
The aspect of the thites last-named plants is more e like that of the true 
sl-measure ferns than any of the others; but the whole association, a 
— demand that they poe be sais toa 2 lenuia 
New a 
—Frond slender, flexuous, in jofts or pes branching. or 
s long, very slender. 
s equalis, Brong. Hist. Vex. teas P. 58 vt figs. Sands 
pond pinnate or bipinnate; rachis nd almost equal. 
; branches n | 
