midvein

IPA: mˈɪdvˈeɪn

(botany) The main vein of a simple leaf or leaflet, running from the petiole to its apex, and from which the other veins usually spread.

Examples of "midvein" in Sentences

Fruit-dots large, round, half way between the midvein and the margin.
Fruit-dots near the midvein, the sides of the sinus often overlapping.
The main rib or vein of a segment, pinnule, pinna, or frond; a midvein.
Sori numerous, rather near the midvein, stipe and rachis lustrous brown.
In a bipinnate frond one of the smaller divisions extending to the secondary midvein.
Sori in rows each side of the midvein, one to each tooth and often scattering on the lower pinules.
Sori linear, a row on either side of the midvein, and at right angles to it, the indusium appearing to be double.
A frond is bipinnate (Latin, _bis_, twice) when the lobes of the pinnæ extend to the midvein as in the royal fern (Fig. 2).
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.
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).