decussate


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.

decussate

 [de-kus´āt]
1. to cross in the form of an X.
2. crossed like the letter X.

de·cus·sate

(dē-kŭs'āt),
1. To cross.
2. Crossed like the arms of an X.
[L. decusso, pp. -atus, to make in the form of an X, fr. decussis, a large, bronze Roman (2nd c. BCE), 10-unit coin marked with an X to indicate its denomination]

de·cus·sate

(dē-kŭs'āt)
1. To cross.
2. Crossed like the arms of an X.
[L. decusso, pp. -atus, to make in the form of an X, fr. decussis, a large, bronze Roman (2nd c. BCE), 10-unit coin marked with an X to indicate its denomination]

decussate

(of leaves) at right angles to each other.
References in periodicals archive ?
1: Apical -- x surface with decussate sculpture, base with fine spiral sculpture; periphery rounded with thin raised cord; peristome reflected over umbilicus.
strong ocellar bristles, decussate postocellars, cluster of setulae on anterior of frons and two rows of postocular setae).
Opposite decussate leaves, glabrous or with very short hairs sparsely distributed along the central vein; elliptic oblong-elliptic or ovate-elliptic, blade (4.8-)5-8 cm long and (2-)3(-5) cm wide; acute-acuminate or acute apex, base usually acute-cuneate, entire margin, venation mix-camp todromous; papiracea.
Postvertical (postocellar) setae decussate, intersection high (Figs 2, 4).
A remarkable maize mutant, aberrant phyllotaxy1 (abph1) displays a decussate phyllotactic pattern (leaves are paired at 180[degrees] and the following leaf pair develops at a 90[degrees] angle) while wild type maize develops as distichous (alternating leaf initiation) plants.
Ganguelia Robbr., for instance, shows 30% decussate and 70% tetrahedral tetrads in the same specimen; a single rhomboidal uniplanar tetrad has
Leaves alternate, decussate, or whorled, sometimes distally clustered on shoots, entire to serrate, and often with margins strongly revolute and leaves needle-like (i.e., ericoid); stipules lacking; i.e., leaf epidermal cells lignified or not, and hypodermal cells often present; stomata usually anomocytic or paracytic; vascular bundles frequently associated with a fiber sheath; nodes usually unilacunar.
Swamy and Bailey (1949) and Endress (1993) determined that this aggregation is an inflorescence, based on the suture positions and also on the fact that the carpels are in an approximately decussate arrangement, not at the same level, and that each has a membranous bract at the base.
Morphologically the subtending, decussate lateral appendages in pim flowers (presepal) seem homologous with bracteoles, as seen in Sophora japonicum (Tucker & Douglas, 1994).
Ovulate strobili (female cones, seed cones, megastrobili, megasporangiate strobili) consisting of a solitary ovule that is terminal, sessile or on a peduncle to 1.5 cm long; sterile scales persistent, 6-14, spirally arranged or opposite and decussate; mature ovule or seed surrounded by an aril (a fleshy part of the megasporophyll that develops from the axis or apex of the ovule- bearing axillary shoot); aril globose to ovoid or oblong, 5-30 x 10-15 mm, sweet, pulpy, red, white, green, or purple; seed dry and nutlike, with 2 cotyledons.
has previously been shown to be consistently lower compared with other bivalve species such as various clams (Spisula spp., Ensis spp, Ruditapes decussate, Solen marginatus), peppery furrow shell (Scobicularia phma), carpet shell (Venerupis vellastra), cockles (Cerastoderma edule), scallops (Patinopecten yessoensis), and oysters (Crassostrea japonica) (Jorgensen et al.
Seasonal variations in condition, reproductive activity, and gross biochemical composition of two species of adult clam reared in a common habitat: Tapes decussates L.