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The leaf is connected to the stem by the leaf trace, which grows through the leaf gap. The leaf gap is a break in the vascular tissue of a stem above the point of attachment of a leaf trace. [1] It exists in the nodal region of the stem as a "gap in the continuity of the primary vascular cylinder above the level where a leaf trace diverges ...
Microphylls contain a single vascular trace. The clubmosses and horsetails have microphylls, as in all extant species there is only a single vascular trace in each leaf. [ 2 ] These leaves are narrow because the width of the blade is limited by the distance water can efficiently diffuse cell-to-cell from the central vascular strand to the ...
Much lateral branch systems would, indeed, be very similar to those of conifers. Leaf and branch trace formation-The protoxylem regions are radially elongate, and except in regions just above levels of leaf trace divergence consist of two protoxylem poles connected by a sheet of protoxylem tracheids mixed, apparently, with parenchyma.
In a leaf, the adaxial surface of the leaf will usually be the upper side, with the abaxial surface the lower side. The sugars synthesized by the plant with sun light are transported by the phloem, which is closer to the lower surface. Aphids and leaf hoppers feed off of these sugars by tapping into the phloem. This is why aphids and leaf ...
Asteroxylon differs from other similar Early Devonian lycopsids such as Drepanophycus and Baragwanathia in that the singular vascular leaf trace in these latter plants extends into the leaf. [3] The leaves of Drepanophycus and Baragwanathia are therefore considered to be true microphylls or, alternatively, small leaves. [12]
The extinct zosterophylls have at most only flap-like extensions of the stem ("enations") rather than leaves, whereas extant lycophyte species have microphylls, leaves that have only a single vascular trace (vein), rather than the much more complex megaphylls of other vascular plants.
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