scalariform


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scalariform

[skə′lar·ə‚fȯrm]
(biology)
Resembling a ladder; having transverse markings or bars.
References in periodicals archive ?
3e), vessel-to-axial parenchyma and vessel-to-ray pitting scalariform to transitional.
Scalariform perforations; ray Minquartia guianensis height over 1 mm, axial parenchyma diffuse and diffuse-in-aggregates, paratracheal scanty; vasicentric tracheids 8b.
integra have nine layers of scalariform thickenings in the radial walls as compared to three in C.
Hypothesis: Because air emboli tend to stop at perforation plates, regardless of whether perforation plates are scalariform or simple (Slatyer, 1967), shorter vessel length may be disabled in a plant with shorter vessel elements.
Remarks: The deeply impressed suture, the scalariform whorls, and the slight terminally twisted columella immediately distinguish Rectaxis pagodus from R.
Cheadle (1942) also offers some gradate phylogenetic progressions, based mostly on the end walls of vessel elements: long scalariform perforation plates are considered indicative of "primitive" conditions, simple perforation plates are considered at the opposite extreme, indicators of specialization.
Sieve plates are scalariform and show low lignification of cell walls.
The polarity of the tracheid-vessel transition and that from tracheid-like vessel elements that were long and narrow with scalariform pitting and perforation plates to short, wide elements with alternate pitting and simple perforation plates was then used to anchor inferences regarding a suite of other characters in the wood given their association with vessels of a given "level of specialization" (Table 1).
solitary vessels with small diameter, very oblique endwalls, and scalariform perforation plates in Oncotheca), the presence of multilacunar nodes in Oncotheca is in sharp contrast to the unilacunar nodes so characteristic of Theaceae.
Chenery and Sporne (1976) hypothesized that aluminum hyperaccumulation is a primitive character based on a statistical correlation with seven primitive characters: woodiness, scalariform perforation plates, scalariform vessel pitting, apotracheal parenchyma, nonstoried wood, early fossil records, and tropical rain-forest distribution.
Leaf traces are collateral with scalariform tracheids.
1200 records) and examined chronological patterns for the incidence of such features as vessel element length, scalariform perforation plates versus simple plates, opposite and scalariform versus alternate intervessel pitting, imperforate element pit structure, heterocellular versus homocellular rays, and axial parenchyma distribution patterns [ILLUSTRATION FOR FIGURE 1 A-D OMITTED].