We are grateful to late Prof. Toshimasa Tanai (Prof. Emeritus, Hokkaido University) for his donating his cleared leaf slides to NMNS. To keep the accuracy of identification, extant leaves used in these slides were mostly collected from statures planted in botanical gardens in all over the world (Tanai, 1981). We also would like to thank all the contributors and institutions listed below for providing their materials. This project was financially supported by the Digitalization Project in the National Museum of Nature and Science, Japan.

Institutes in Japan

• Agriculture, Forestry Research Center, Ishikawa
• Arboretum, Faculty of Agriculture, Kagoshima University, Kagoshima, Kagoshima
• Arboretum, Subtropical Plant Institute, Kyoto University, Kii-Oshima, Wakayama
• Aritaki Arboretum, Koshigaya, Saitama
• Asakawa Experimental Forest, the Forest Experimental Office, Hachioji, Tokyo
• Atagawa Tropical Garden, Higashi-Idzu, Shizuoka
• Botanical Garden of the Iwate University, Morioka, Iwate, Japan
• Botanical Garden, Hokkaido University, Sapporo, Hokkaido
• Botanical Garden, Kyoto University, Kyoto, Kyoto
• Botanical Garden, Osaka City University, Katano, Osaka
• Botanical Garden, Tohoku University, Sendai, Miyagi
• Department of Botany, National Science Museum, Tokyo
• Experimental Arboretum, Faculty of Agriculture, Kyoto University, Kyoto, Kyoto
• Faculty of Agriculture, University of Ryukyus, Okinawa
• Higashiyama Botanical Garden, Nagoya, Aichi
• Keiomogusaen, Tokyo
• Kenmotsudai Arboretum, Kumamoto
• Koishikawa Botanical Garden, University of Tokyo, Tokyo
• Kyoto Botanical Garden, Kyoto, Kyoto
• Nikko Botanical Garden, Nikko, Tochigi

Institutes overseas

• Adelaide Botanic Gardens, Adelaide, Australia
• Arboretum, Winchester, U.K.
• Arboretum, the University of Washington, Seattle, U.S.A.
• Arnold Arboretum, Harvard University, Jamaica Plain, Massachusetts, U.S.A.
• Botanical Garden, Lota, Chile
• Botanic Garden of Indonesia, Bogor, Indonesia
• Botanic Garden of Singapore, Singapore
• Botanic Garden of the University, Leiden, the Netherlands
• Botanic Garden, Taiwan Forestry Research Institute, Taipei, Taiwan
• Botanic Garden, the University of Copenhagen, Copenhagen, Denmark
• Botanical Garden, the University of California, Berkeley, U.S.A.
• Botanical Garden, the Uzbek Academy of Sciences, Tashkent, Uzbekistan
• Botanischer Garten Berlin-Dahlem, Berlin, Germany
• Botanischer Garten der Universität Zurich, Switzerland
• Botany Division, D. S. I. R., Christchurch, New Zealand
• Brooklyn Botanical Garden, New York, U.S.A.
• Hillier Arboretum, near Romsey, England
• Hortus Botanicus Bergianus, Stockholm, Sweden
• Nanjing Sun Yat-Sen Botanical Garden, Nanjing Institute of Botany, Nanjing, People's Republic of China
• New York Botanical Garden, New York, U.S.A.
• Royal Botanic Gardens, Kew, England Royal Botanic Gardens, Sydney, Australia
• Royal Botanic Gardens, Sydney, Australia
• Royal Tasmanian Botanic Gardens, Hobart, Australia
• University Botanic Garden, Cambridge, England

Individuals^*

• Dr. F. Maekawa (Res. Inst. Evol. Biol.)
• Dr. G. Murata (Kyoto Univ.)
• Dr. H. Hatta (National Museum of Nature and Science)
• Dr. H. Kanai (Department of Botany, National Science Museum, Tokyo, Japan)
• Dr. H. Setoguchi (Kyoto Univ.)
• Dr. I. Fujiyama (Dept. Geol. Paleontol., NSM)
• Dr. J. Murata (Univ. Tokyo)
• Dr. K. Huzioka (Institute of Mining Geology, Mining College, Akita University, Akita, Japan)
• Dr. K. Iwatsuki (Department of Science, Kyoto University, Kyoto, Japan)
• Dr. K. Naohara (Tohoku Univ.)
• Dr. K. Ozaki (Yokohama Natn. Univ.)
• Dr. K. Sohma (Department of Science, Tohoku University, Sendai, Japan)
• Dr. M. Suzuki (Tohoku Univ.)
• Dr. S. Endo (Tohoku Univ.)
• Dr. S. Kokawa (Osaka City Univ.)
• Dr. S. Kurata (Univ. Tokyo)
• Dr. S. Miki (Osaka City Univ.)
• Dr. T. Nakaike (Natural History Museum and Institute, Chib)
• Dr. T. Oishi (Nippon Steel Co. Ltd.)
• Dr. T. Onoe (Geological Survey of Japan)
• Dr. W. Ishijima (Rikkyo Univ.)
• Dr. Y. Hase (Kumamoto Univ.)
• Dr. Y. Sasa (Hokkaido Univ.)
• Mr. Y. Doi (Kagoshima Pref.)
• Mr. Y. Shimada (Taiwan)
• Dr. A. Matos (Brasil)
• Dr. A. Nelson (Univ. Wyoming, U.S.A.)
• Dr. A.M. Gray (Royal Tasmanian Botanic Gardens, Hobart, Australia)
• Dr. B. Lotowycz (Planting Fields Arboretum, Long Isl., N.Y., USA)
• Dr. B. Mulligan (Univ. Washington, U.S.A.)
• Dr. Becker (New York Botanical Garden, New York, U.S.A.)
• Dr. C.J. Smiley (Univ. Idaho, USA)
• Dr. D. Demaree (Hendricks College, Arkansas, U.S.A.)
• Dr. E. Asplund (Bergius Botanic Garden, Stockholm, Sweden)
• Dr. G.J. Harden (Royal Botanic Gardens, Sydney, Australia)
• Dr. H.A. Fröding (Sweden)
• Dr. H. Garcia-Barriga (Columbia)
• Dr. H.L. Mason (Univ. California, Berkeley, California, U.S.A.)
• Dr. H. Streimann (Department of Forests, Papua New Guinea Forestry College, Bulolo, Papua New Guinea)
• Dr. J. Ericsson (Sweden)
• Dr. J.F. Macbride (Univ. Wyoming, U.S.A.)
• Dr. J.P. Tracy (Humboldt Country, California, U.S.A.)
• Dr. J. West (Australian National Botanic Gardens)
• Dr. M.E. Poilane (Forest Service in Indochina)
• Dr. M. Galore (Division of Botany, Office of Forests, D.P.I., Lae, Papua New Guinea)
• Dr. M.M. Shick (Seccion Botanica, Museo Nacional de Historia Natural, Santiago, Chile)
• Dr. P.O. Schallert (U.S.A.)
• Dr. P. Wardle (Botany Division, D. S. I. R., Christchurch, New Zealand)
• Dr. R. Santesson (Uppsala University, Sweden)
• Dr. R.A. Howard (Arnold Arboretum, Harvard University, Jamaica Plain, Massachusetts, U.S.A.)
• Dr. C.Q. Sheng (Nanjing Sun Yat-Sen Botanical Garden, Nanjing Institute of Botany, Nanjing, People's Republic of China)
• Dr. T.J. Delendick (New York Botanical Garden, New York, U.S.A.)
• Dr. W.E. Rogers (Herb. P.O. Schallert, Winston-Salem, N.C., U.S.A.)
• Dr. W.P. Fang (Inst. Botany, Chinese Academy of Sciences, China)
• Dr. Y. Xu (Kunming Institute of Botany, Chinese Academy of Sciences, China)

^*Affiliation at the time of donation