Midvein

The male fern resembles the marginal shield fern in outline, but the fronds are thinner, are not evergreen, and the sori are near the midvein. ❋ George Henry Tilton (N/A)

Sori numerous, rather near the midvein, stipe and rachis lustrous brown. ❋ George Henry Tilton (N/A)

Sori linear, a row on either side of the midvein, and at right angles to it, the indusium appearing to be double. ❋ George Henry Tilton (N/A)

The main rib or vein of a segment, pinnule, pinna, or frond; a midvein. ❋ George Henry Tilton (N/A)

A frond is bipinnate (Latin, _bis_, twice) when the lobes of the pinnæ extend to the midvein as in the royal fern (Fig. 2). ❋ George Henry Tilton (N/A)

Sori in rows each side of the midvein, one to each tooth and often scattering on the lower pinules. ❋ George Henry Tilton (N/A)

Fruit-dots large, round, half way between the midvein and the margin. ❋ George Henry Tilton (N/A)

Fruit-dots near the midvein, the sides of the sinus often overlapping. ❋ George Henry Tilton (N/A)

In a bipinnate frond one of the smaller divisions extending to the secondary midvein. ❋ George Henry Tilton (N/A)

A frond is pinnátifid when its lobes extend halfway or more to the rachis or midvein as in the middle lobes of the pinnátifid spleenwort (Fig. 3). ❋ George Henry Tilton (N/A)

Interrupted leaves, with an ascidium on a naked prolongation of the midvein, are by no means limited to the _Croton_ varieties. ❋ Hugo De Vries (1891)

[673] Likewise we must refrain from a consideration of the physiologic qualities of the tendril, and confine our attention to the combination of a limb, a naked midvein and an ascidium. ❋ Hugo De Vries (1891)

On the middle of the midvein these leaves are seen to bear small clusters of flowers; indeed this is the only place where flowers are produced. ❋ Hugo De Vries (1891)

Here the margin of the leaves is deeply cut and divided by many incisions, which sometimes change only the outer parts of the blade, but in other cases may go farther and reach, or nearly reach, the midvein, and change the simple leaf into a seemingly compound structure. ❋ Hugo De Vries (1891)

He spreads his legs so the female sees the erection, and he tears the leaf bit by bit down the midvein of the leaf, dropping the pieces as he detaches them. ❋ Jessica Pauline Ogilvie (2010)

The tiny caterpillars eat the tip off a leaf, leaving just the midvein. ❋ Unknown (2009)

They also sometimes glue random bits of dead leaf material along the midvein higher up. ❋ Unknown (2009)

_appendiculatum_, and these names both relate to the interruption of the leaves by a naked midvein. ❋ Hugo De Vries (1891)

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