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The extreme points of some of the branchlets are rolled up so as to resemble the croziers or circinate vernation of ferns; the leaves or bracts, a, supposed to belong to the same plant, are described by Dawson as having inclosed the fructification. The remains of Psilophyton princeps have been traced through all the members of the Devonian series in America, and Dr.
In lat. about 21 degrees 6 minutes, we crossed a large creek, densely lined with dropping tea trees, coming from the westward. Its leaves, however, had neither the vernation nor the pellucid dots of Myrtaceous trees.
In the Balm of Gilead, the leaf is involute, rolled towards the midrib on the upper face. Other kinds of vernation are revolute, the opposite of involute, where the leaf is rolled backwards towards the midrib; circinate, rolled from the apex downwards, as we see in ferns; and corrugate, when the leaf is crumpled in the bud.
They are much larger than in our native species of Black and White Spruce. The Evergreens are a very interesting study and an excellent exercise in morphology for the older scholars. Vernation. This term signifies the disposition of leaves in the bud, either in respect to the way in which each leaf is folded, or to the manner in which the leaves are arranged with reference to each other.
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