The National Cleared Leaf Collection-Hickey
Leo J. Hickey1, 2 and Shusheng Hu1
1Division of Paleobotany, Yale Peabody Museum, Yale University, P. O. Box 208118, New Haven, CT 06520
2Department of Geology and Geophysics, Yale University, P. O. Box 208109, New Haven, CT 06520
Introduction
The National Cleared Leaf Collection-Hickey (NCLC-H) consists of more than 7,000 glass slides of cleared and stained
extant leaves mounted between sheets of optical quality, distortion-free glass.
The NCLC-H is currently arranged alphabetically by family, then by genus and species.
There are approximately 321 families and 1,300 genera, including herbaceous, parasitic,
Arctic, alpine and derived groups such as the Asteridae, in an effort to elucidate the full range of
dicotyledonous leaf morphological patterns. Also, there are a significant number of extinct and endangered
species, such as Canacomyrica monticola from New Caledonia. The collection presently covers
floras from South America, North Central America, Oceania and Asia. Most of the leaves have been taken from
herbarium collections, with some prepared using fresh or fluid-preserved specimens. Each specimen is vouchered
to an authoritatively identified herbarium sheet. Once collected, the leaves are cleared in bleaching solutions,
stained and then mounted in resin between sheets of optical glass. Over the years various mounting mediums have
been used, including Coverbond, Histoclad, Cytoseal and Canada balsam. The majority of leaves are mounted on four
different sizes of glass: 2"x 3", 4"x 3-1/4", 4"x 5" and 5'x 4-1/2". Labels are also placed between the glasses
as the leaves are mounted. The size, scope, documentation, and the quality of the mounts make the NCLC-H the most
important database of leaf architecture in the world. At the present time, the NCLC-H provides the main source of
documentation for the systematic description of leaf architectural variation among the dicotyledons and has been the
basis for the current system of leaf architectural classification, fossil and modern plant identifications,
ecological and paleoecological studies, as well as ongoing studies into the ontogeny of leaf venation.
History
Leo J. Hickey began the NCLC-H at the Smithsonian Institution in 1969 as part of his research on the systematic distribution of the leaf characters of the flowering plants in relation to the evolution of the group. When Hickey came to Yale University in 1982, the NCLC-H was loaned to the Yale Peabody Museum for Hickey's ongoing research. The NCLC-H was returned to Smithsonian National Museum of Natural History in May, 2014.
Scope of Coverage
Geographic and Taxonomic Distributions of National Cleared Leaf Collection-Hickey |
||
Geographic Distribution |
South America |
18% |
North America |
17% |
|
Central America |
10% |
|
Oceania |
10% |
|
Asia |
10% |
|
Other (Australia, Africa, Europe, Middle East and Caribbean) |
35% |
|
Taxonomic Distribution |
Coniferales |
<1% |
Filicales |
<1% |
|
Ginkgoales |
<1% |
|
Gnetopsida |
<1% |
|
Angiospermopsida |
98% |
Terms of Use
The copyright of all NCLC-H images belongs to Yale Peabody Museum. The Museum grants permission for personal or scholarly use of images, text and data for reproduction for personal, educational or academic purposes without personal or corporate gain (e.g., for study, teaching, theses, and published research). Commercial use of these images is prohibited without written permission from Peabody's Division of Paleobotany.
Acknowledgements:
We would like to thank the following volunteers for their efforts in photographing the collection and providing curatorial support.
Whitney Barlow
Donna Beeson
Serra Vidinli Dedeoglu
Michelle Garcia
Gabriela Gonzalez
William Guth
Zoe Kitchel
Philip Kuchuk
Steven Mordarski
John Petrucelli
Ornella Rossi
Carl Russell
Jared Shayne
Robert Swerling
Cecilia Tenorio
We would like to thank the following Yale students:
Alyssa Cheung
Joanna Liu
Ivette Lopez
Paul Pena
Thanks also go to:
Linda Klise, former Senior Collections Manager, Division of Paleobotany, Yale Peabody Museum
Larry Gall, head of the Computer System Office, Yale Peabody Museum
Sally Palatto, Graphic Designer, Yale Peabody Museum
Harry Shyket, Digital Media Specialist, Yale Peabody Museum
Tim White, Director of Collections & Operations, Yale Peabody Museum