83 
APPENDIX.^ 
Angular Prickly Pern. PolysticJium Angulare. 
Page 69. 
1. Dense Angular Prickly Pern. Densum. Mr. Moore 
seems to have given the distinguishing name to this variety, 
because the leaflets are crovrded together, and the rachis 
of the frond and of each pinna is densely covered with hairy 
scales. It may be observed that the leaflets are rounded at 
the summit, with its ear or auricle distinctly sticking out 
at the base. If the auricle were cut ofi*, they would then 
be egg-shaped or oblong. The leaflets are also small, stalked, 
and serrated ; the lowermost on the upper side of each pinna 
is longer than the rest, and divided at the edge into very- 
small but distinct lobes. At the extremity of each serrature 
there is a short bristle, and these bristles are very conspic- 
uous. The scales of the stalk are not hairy, as those of the 
rachis, but broadly lance-shaped, shining, light brown, and 
transparent. The frond is not so remarkably drooping as 
most of the Angular Perns, and is rather erect than hori- 
zontal. Its form is lance-shaped, and rather tapering to- 
ward the apex. Occasionally there is a little irregularity 
in the length of the pinna, but this is not sufiicient to 
disfigure the plant, which, with its congeners, has a fair and 
goodly appearance, and though not so luxuriant as other 
varieties, is neat, light, and graceful. Our fronds are about 
nine inches long. It has been found at Dalwood and Kil- 
mington. 
Dark Scaled Pern. Lastrea Bilatata, 
Pages 26 and 68. 
2. Dark Scaled Pern of the Hill. Collina, This is a very 
beautiful variety, having a dark green frond, sometimes 
* The three varieties inserted in the Appendix, were discovered after the pre« 
ceding sheet had passed through the press, 
