scalariform


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scalariform

[skə′lar·ə‚fȯrm]
(biology)
Resembling a ladder; having transverse markings or bars.
References in periodicals archive ?
What is the syndrome of features associated with the scalariform pitting pattern of tracheary elements?
1 Vessels with exclusively scalariform perforation plates
integra have nine layers of scalariform thickenings in the radial walls as compared to three in C.
Each cell has eight to 10 layers of scalariform thickenings, this character gives the seed a deep honeycomb appearance.
1930): "In view of the proof offered that the transition from the protoxylem to the secondary xylem represents a primitive to specialized sequence which is palingenetic, and the accurate portrayal this sequence gives the change from scalariform to porous perforations, there is little reason to doubt that the detailed transitions here illustrated give a connected picture of the evolution of the scalarifiorm vessel segment from the scalariform tracheid" (1930, pp.
In group I, the perforations are prevailingly scalariform; in group II, intermediate between scalariform and porous; and in groups III and IV, prevailing porous .
These authors found that fern xylem consisted mainly of tracheids with scalariform pitting and, in less proportion, vessel elements.
Rays sometimes very large, distended along the ring boundary; RLS: Perforation plates simple and scalariform (bars >15).
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].