vascular layer

Just who is crazy enough to go swimming when the pond across the street has a layer of ice across the top?
Diving Into 2015 With Polar Bear Plunge Extremists|James Joiner|January 1, 2015|DAILY BEAST
When summer comes, adult beetles attack and larva feed in the cambium layer, girdling the trees and sealing their doom.
What It Takes to Kill a Grizzly Bear|Doug Peacock|November 23, 2014|DAILY BEAST
After maybe an hour, the firefighters had cut through the last layer of a 4- by 8-foot area.
Rescue at One World Trade Center|Michael Daly|November 13, 2014|DAILY BEAST
These words take on a dark layer of irony given the charges facing her.
Colombian Beauty Queen Arrested for Running Child Prostitution Ring|Jason Batansky|October 17, 2014|DAILY BEAST

With each successive layer of networks, the U.S. became more potent.
Electricity Superhighway||October 16, 2014|DAILY BEAST
It separates into three layers upon standing—a brown deposit, a clear fluid, and a frothy layer.
A Manual of Clinical Diagnosis|James Campbell Todd
The upper surfaces of the boilers were covered with a layer of ashes for the same purpose.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
By the repetition of this process, a layer of several feet in thickness, of an excellent soil, is accumulated on the surface.
Elements of Agricultural Chemistry|Thomas Anderson
He was shot by a man of the 32d, and his body formed the lowermost layer of a causeway of corpses that soon choked the ditch.
The Red Year|Louis Tracy
Laura drew out the third drawerjust glancing at the top layer of papersand then the fourth and last.
The Girls of Central High on the Stage|Gertrude W. Morrison