Fossil wood from the lower Miocene of Myanmar (Natma Formation): palaeoenvironmental and biogeographic implications Author Gentis, Nicolas Author Licht, Alexis Author Boura, Anaïs Author Aung, Dario De Franceschi Zaw Win Day Wa Author Dupont-Nivet, Guillaume text Geodiversitas 2022 2022-09-29 44 28 853 909 journal article 160069 10.5252/geodiversitas2022v44a28 72def8b5-32ce-44ea-9b40-28a3d239c00c 1638-9395 7145305 urn:lsid:zoobank.org:pub:2611B0BC-F569-4135-A09C-6E527C2565A4 SIMPLIFIED IDENTIFICATION KEY FOR FOSSIL DIPTEROCARPACEAE BLUME This identification key is based on Schweitzer (1958) ; with additional informations of Anisopteroxylon Ghosh & Kazmi and Hopenium Awasthi from Poole (1993) and Awasthi (1980) respectively. 1. Secretory canals diffuse or in short tangential lines up to 8. Rarely long lines .............................................. 2 — Secretory canals almost always in long tangential lines. Rarely isolated ........................................................ 4 2. Narrow vessels (mean diameter <150 µm) ..................................................................................................... ....................................................................................... Vaterioxylon Trivedi & Misra / Vaticoxylon Schweitzer — Wide vessels (mean diameter> 150 µm) ..................................................................................................... 3 3. Diffuse and small canals, sheath cells abundant ............................................ Anisopteroxylon Ghosh & Kazmi — Canals in short lines, solitary vessels ....................................................................... Dipterocarpoxylon Holden 4. Exclusively solitary vessels, fibre-tracheids ......................................................... Dryobalanoxylon Den Berger — None of these combined ............................................................................................................................. 5 5. Upright or square cells interspaced with procumbent cells ................................................ Hopenium Awasthi — Only procumbent cells in median portion (or sheath cells) ........................................ Shoreoxylon Den Berger