It is necessary here to observe that the genus Lastrsea is very justly established on the ruins of Aspidium, in consequence of the marked difference in the structure, etc. of the indusium or involucre. In Aspidium it is nearly orbicular, whereas in Lastraea it is orbicu-lar-reniforme, which was also, I believe, the origin of the genus Nephrodium; and as the shape, substance, and position of the involucre, where present, form an essential part in the generic character of most of our Ferns. The division, therefore, I consider to be highly necessary; besides, the two genera are, in general habit, very different.

1. A. Lonchitis

The habitats of this pretty Fern are mostly the clefts of rocks in mountainous countries, notwithstanding which it is not particularly difficult to cultivate, if planted in light sandy loam and peat, and removed at the commencement of the growing season; for if left until the resting state, it is but too often inclined to remain so for a long time, and then damp off; but if potted in the early spring, and shut close under glass, it will soon adhere to the fresh soil, and send up beautiful fronds, at which time it is best to plant it out where it is intended to remain. I find the above mode of culture suits this Fern extremely well. The fronds are pinnate, and the pinnae eared above.

Nursery, Foot's Cray, May 1850. Robert Sim.