'birchbark' is a correct and usable word in written English.
You can use it to refer to the outer layer of a birch tree. For example: "I used a piece of birchbark to make a small canoe."
Unlike the kayak, it was an open boat, either round in shape or elongated much like the birchbark canoe.
The birchbark canoe of the North American Indians could still be found in use into the early 20th century, but in most areas canvas had gradually taken the place of bark long before 1900.
The large birchbark maitre canot of the fur trade, an oversized version of the Indian canoe, also was once of economic importance.
Bark canoes developed in a few areas, ranging in design from craft having only the most elementary framing to the highly developed birchbark canoes of the North American Indians.
The birchbark canoes had a thin plank lining held against the inside of the bark cover by an extensive framing of ribs forced under the gunwale.
Canvas-covered hulls follow the general plan of birchbark canoe construction in that they have a plank lining supported by ribs.
Did the one-of-a-kind, king-size birchbark-and-twig mosaic bed in your $600-a-night suite at the rustic Lake Placid Lodge catch your eye?
A notable inclusion in the American lists is "The Birchbark House", written and illustrated by Louise Erdrich, already an acclaimed novelist for grown-ups.
She had also begun working at Birchbark Books, an independent bookstore in Minneapolis owned by the author Louise Erdrich that specializes in American Indian writers.
A man in a parka grabs me — he's one of my oldest friends in Minneapolis, and his son has worked at my bookstore, Birchbark Books.
The bride's father, now retired, was the founder of BirchBark Technology in Lake Placid, N.Y., which designed specialized computer workstations.
