Dictyoxylonn.
/ˌdɪktɪˈɒksᵻlɒn/, U.S. /ˌdɪktiˈɑksəˌlɑn/ Palaeontology.
Originally: †any of various Carboniferous seed ferns of the former genus Dictyoxylon, occurring in the European coal measures as fossil stems having longitudinally-oriented bands of fibres in the outer cortex, often forming an interconnecting network of strands (obsolete). In later use: (attributive) designating this type of cortical structure.
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1869 W. C. Williamson in Monthly Microsc. Jrnl. 2 72 How abundant these large exogens—especially the Dictyoxylons—are in the Coal-measures.
1891 H. E. F. Garnsey tr. H. zu Solms-Laubach Fossil Bot. 8 As the rind of the Sigillarias went by the name of Dictyoxylon, Will., when its connection with the stem was not yet recognised, the word, though now superfluous, may still be used to designate this particular form of structure.
1896 Naturalist Jan. 28 The Dictyoxylons of the Coal Measures.
1922 Bot. Gaz. 74 129 Their disposition in the periphery probably was determined by the approximately dictyoxylon type of cortex.
1952 Ann. Missouri Bot. Garden 39 272 The most complex type of periderm..is that known as ‘Dictyoxylon Cortex’. This consists of a network of ordinary periderm cells, while the meshes..are filled with thin-walled, block-like parenchymatous cells.
2000 Amer. Jrnl. Bot. 87 (Supp.) 79 The outer cortex shows the characteristic Dictyoxylon structure of Lyginopteris.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online March 2022).
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