1046 
DE. HEEE ON THE FOSSIL FLOEA OF BOVET TEACET. 
II. FILICES. 
1. Laste^a, Bory, Alex. Braun. {Phegopteris, Mettenius.) 
4. LASTE.EA (Goniopteeis) Stieiaca. (Plate LVI. figs. 12-15.) 
L. fronde pinnata, pinnis linearibus, praelongis, grosse crenatis serratisve, nervis 
secundariis e nervo primario angulo subacute egredientibus, pinnatis, nervis ter- 
tiariis utrinque plerumque 6-7, curvatis, subparallelis, angulo acute egredientibus, 
soriferis ; soris rotundatis, biseriatis. 
Heer, Flora Tertiaria Helvetiee, i. p. 31 ; iii. p. 151 ; pi. 6, 7, 143, figs. 7 & 8. 
Polypodites stiriacus^ Unger, Chloris Protogaea, p. 121, pi. 36. 
This is the tertiary fern which has the widest distribution. It appears rarely in the 
Upper Molasse, however (on the Albis, in Parschlug and Sarzanello), but very often 
in the Aquitanian stage of the Lower Miocene formation — thus at Monod, the Paudeze, 
Hohen Ehonen, &c., in France at Menat, and in Italy at Cadibona. Several portions 
of leaves have been found at Bovey, the determination of which is undoubted. The leaf 
figured in fig. 15 represents a pinnule in almost its whole length ; the other figures 
represent parts of leaves, the nervation of which is well preserved (Plates LVI. fig. 12 ; 
LVII. fig. 8). The specimen Plate LVI. fig. 14 is a portion of a leaf with the rachis, 
on the side of which the pinnules are attached. The pinnule is long and narrow, with 
parallel sides, deeply toothed, the teeth bent towards the apex ; their long side forms an 
arch, the sinus is acute. The principal nerve of the pinnule is strong, the secondary 
nerves are fine, springing at acute angles and forming a slight arch ; from each second- 
ary nerve spring, on the inner side five or six, and on the exterior side six or seven, but 
seldom eight, tertiary nerves. They are strongly bent upwards, and united exactly in 
the same manner as in the specimens I have described in the ‘Flora Tertiaria Helvetise’ 
(vol. i. p. 31). At Bovey, hitherto, only sterile leaves have been found, whilst Monod 
has furnished pinnae covered with sori (cf. Plate LVI. fig. 13). The sori are in the 
middle, or a little outside the middle of the tertiary nerves; they are round, small, 
and ranged in two lines, converging towards the apex. We see, from the specimens 
discovered at Monod, that this species was a very large one. The leaves attained pro- 
bably a length of 3 feet and a diameter of at least 1 foot. The pinnules are very distant 
from each other at the base of the leaf, whilst above they approach and get gradually 
shorter. Most of the specimens are from the 17th bed of Bovey, I saw, however, one 
in the clay of the 26th bed. 
Lastrma Stiriaca most resembles L. prolifera, Kaulf. [Phegopteris prolifera^ Metten.), 
of tropical America, and belongs to the genus Lastrcea (div. Goniopteris), as Alex. Beaux 
has established it (cf. Flora Tertiaria Helvet. i. p. 30, and iii. p. 150). 
5. Laste^a Bunbueii, m. (Plate LXIII. fig. 1, magnified, c, d.) 
L. fronde pinnata (1), pinnis linearibus, apicem versus angustatis, argute serratis, 
nervis secundariis flexuosis, e nervo primario angulo subacuto egredientibus, pin- 
