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: a woody perennial plant having a single usually elongate main stem generally with few or no branches on its lower part (tree, 2015)
(fern, club moss)
(moss, liverwort, hornwort)
The Most Amazing Thing About Trees
Britain's oldest tree is 'CHANGING SEX' after 5,000 years
The oldest tree in Britain may be switching sex (Mashable)
Characteristics and Growth Requirements of Trees
Leapsnap, Identify Trees from Photo of Leaf
SelecTree, Tree Search
This is an interactive 360° YouTube video -- just press and hold to explore!
Redwoods: Walk Among Giants (360 Video)
Planting and Care of Landscape Trees Part I (education!)
Planting and Care of Landscape Trees Part II
These are links to resources organized by a classification scheme developed exclusively for Cosma.
Subject Specific Links
New World Encyclopedia
Dewey 582.1 Trees and shrubs (BUBL LINK)
Internet Public Library
Best of the Web
Library of Congress
Library of Congress
UPenn Online Books
Barnes and Noble
Open Education Consortium
Quiz on Trees (Fun Trivia)
Life of an artificial tree
Procedurally Generated Apple Tree
Arbor Day (or Arbour; from the Latin arbor, meaning tree) is a holiday in which individuals and groups are encouraged to plant and care for trees. Today, many countries observe such a holiday. Though usually observed in the spring, the date varies, depending on climate and suitable planting season. Arbor Day was first celebrated on April 10, 1872, in Nebraska after Julius Sterling Morton suggested to the State Board of Agriculture that a day be set aside to plant trees. An estimated one million trees were planted on the first Arbor Day.(Arbor Day, 2016)
Arbor Day Foundation Vision
Replanting Our National Forests
Arbor Day, Sally Brown Explains
Charlie Brown's Arbor Day
The Little Rascals D06 @ 07 Arbor Day 1936
Arbor Day Foundation Channel (YouTube)
Arbor Day Foundation (Official Site)
Trees News -- ScienceDaily
Wind, rain play key role in breeding patterns of migratory tree swallows
Wind and precipitation play a crucial role in advancing or delaying the breeding cycles of North ...
Heavy precipitation speeds carbon exchange in tropics
New insight into how forests globally will respond to long-term climate change has been gained by...
Application of statistical method shows promise mitigating climate change effects on pine
Apr 20, 2017
Confronting evidence that the global climate is changing rapidly relative to historical trends, r...
Prescribed forest fire frequency should be based on land management goals
Apr 18, 2017
Researchers have studied forests subjected to different frequencies of fires to determine what ef...
Lice and bacteria, partners in parasitism
Apr 14, 2017
Scientists have sought to better understand the evolutionary history of bacteria residing within ...
The problem expands for avocado growers: 9 beetle species carry deadly fungus
Apr 12, 2017
Many people love their avocados – not to mention guacamole dip. So it was bad enough when s...
When old growth beats old school
Apr 6, 2017
Imitating old-growth forests enhances carbon storage in managed forestland far better than conven...
Monkey business produces rare preserved blood in amber fossils
Apr 3, 2017
Two monkeys grooming each other about 20-30 million years ago may have helped produce a remarkabl...
New species of tree living crab found in Western Ghats
Apr 3, 2017
An article reveals a new genus and new species of tree crab in Kerala, southern India. Known scie...
Scientists go out on a limb to study tree-climbing land snails
Mar 31, 2017
Land snails are generally believed to be ground-dwelling creatures, preferring dark and humid pla...
Methane emissions from trees
Mar 30, 2017
A new study is one of the first in the world to show that tree trunks in upland forests actually ...
Research altered the scientific understanding of the transmission routes of fungal viruses by revealing them to be unfaithful to their host
Mar 30, 2017
Some fungal viruses (mycoviruses) that infect fungi associated with forest trees are able to cros...
Are tree nut allergies diagnosed too often?
Mar 27, 2017
About 50 percent of those who thought they were allergic to all tree nuts were able to pass an or...
Climate change and an 'overlooked' nutrient: Silica
Mar 23, 2017
Sugar maples may have far greater silica pumping power than expected, and also may be more profou...
A new web of life: First full family tree of the world's spiders
Mar 22, 2017
For the first time biologists have made a full family tree of the world's spiders, giving us know...
Livestock can uproot protected wildlife from prime real estate
Mar 21, 2017
The story of wildlife conservation is usually framed as man vs. treasured wildlife. But there's g...
Evolutionary biology professor explains how to 'Walk the Tree of Life'
Mar 21, 2017
A professor discusses why the evolutionary Tree of Life approach to biodiversity education is bes...
'Tree-on-a-chip' passively pumps water for days
Mar 20, 2017
Engineers have created a 'tree-on-a-chip' -- a microfluidic pump inspired by the way trees and pl...
World's oldest plant-like fossils show multicellular life appeared earlier than thought
Mar 14, 2017
Scientists have found fossils of 1.6 billion-year-old probable red algae. The spectacular finds i...
Vicious circle of drought and forest loss in the Amazon
Mar 13, 2017
Logging that happens today and potential future rainfall reductions in the Amazon could push the ...
tree. (2015). In
Merriam-Webster Online Dictionary
(11th ed.). Retrieved June 21, 2015, from
Arbor Day. (2016). In
Wikipedia, The Free Encyclopedia
. Retrieved January 6, 2016, from
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