182 Mm. Dicxson’s Od/ervations on Polypodium Oreopteris. 
ad. When P. Thelyp. grows old, the under fide of the leaf is 
totally covered with the confluent fruétifications, and the edges of 
‘the pinnulz are reflexed or contraéted. In P. Orcopt. the fructifi- 
cations are always on the margins, both in a young and old ftate, 
and never run into one another; the lobes oval and plain. 
3d. The fize of this plant is four times as large as that of p. 
Thelypteris, and the latter always grows in boggy places; whereas 
P. Oreopt. grows in dry woods, moors, and on hills, Veg id near 
water. z 
 Linnzus, in Flo. Suec. fays of P. Thelypt. puncta minutiffina 
difper fa. 
I know of no figure of P. Oreopteris. Mr. Bolton has given a 
{mall fig. t. 22, f. 2, which may be it; but as he has joined it 
with P. Thelypt. it is not worth notice*. 
I have found it both in England and Scotland, moft plentifully 
in the latter. 
How Mr. Lightfoot could miftake this fern, I cannot underftand. 
..* Since the above was written, Mr. Bolton has, in a letter to Mr. Dickfon, acknow- 
ledged his P. Thelypteris to be the P. Oreonteris, His Acroftichum Thelypteris (Fil. Brit. 
t. 43.) is the true Polypodium Thelypteris of Linnzus. 
XX. Account 
