decurrent


Also found in: Dictionary, Medical, Wikipedia.
Related to decurrent: excurrent

decurrent

[di′kər·ənt]
(botany)
Running downward, especially of a leaf base extended past its insertion in the form of a winged expansion.
References in periodicals archive ?
5-3 mm long, obovate, compressed, decurrent with half or more of their length on pedicel, recurved at apex.
The evidence now favours them having been formed through branch abscission, especially since Lindsey (1915) described and illustrated two new specimens of Bothrodendron minutifolium, one showing a short stem bearing a mass of dichotomising leafy shoots that has a clean-cut, trumpet shaped base, the other showing a main axis bearing leafy branches that have similar decurrent, trumpet-shaped bases.
Lamellae white to slightly cream, small depressed or slightly decurrent.
6 mm long, leaves of erect stems appressed with decurrent bases, subulate, 1.
The leaf apices are abruptly acute to gradually acuminate and the leaf base has neither auricular nor decurrent development.
Stem leaves [+ or -] concave, either straight, oblong-ovate with abruptly acute or obtuse and apiculate or rounded apex, or falcate, ovate to oblong-ovate with gradually and shortly to longly acuminate apex; erect-spreading to imbricate, usually complanate; margin plane, entire or slightly denticulate near apex; costa short and double, occasionally absent; median lamina cells linear-flexuose, becoming shorter and wider towards apex and slightly shorter, wider and porose towards base; marginal cells similar or slightly shorter and wider than adjacent median lamina cells; alar cells numerous, hyaline, inflated, forming a well delimited group, slightly or longly decurrent.
5 [micro]m long, thin-walled, smooth, becoming shorter, wider and flexuose towards apex, shorter and wider, longly rhomboidal to rectangular and porose towards base; marginal cells narrower than adjacent median lamina cells; alar cells rectangular, hyaline, inflated, thin-walled, forming a (diffuse to well defined group, triangular, usually reaching the costa, sometimes excavate and broadly decurrent, transition from alar cells to adjacent basal cells gradual; initial cells of rhizoids very common in apex and beside nerve, specially in the upper fifth of leaf.
24) oblong, entire, imbricate, decurrent, more or less spreading; costa pronounced, extending to the apex; walls of cells at leaf base thickened; alar cells (Fig.
5) Show the possible consequences of not pruning decurrent trees.
2 cm, chartaceous, weakly serrulate, 3-veined from near base, acute at apex, decurrent at base, strigose to weakly so, the lower surface also glandular, sometimes obscurely so.