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Dacrycarpus acutifolius
Taxonomy
Dacrycarpus acutifolius was named by Wells and Hill (1989) [Type locality. Mudstone lens, cutting, Monpeelyata canal.
Specimens examined. M-235, 236, 238, 1178.]. It is considered to be a form taxon. Its type specimen is Holotype. M-235, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus acutifolius Wells and Hill p. 396 figs. 15-18 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dacrycarpus acutifolius Wells and Hill 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Wells and R. S. Hill 1989 | Foliage uniform, spirally arranged; leaves bifacial, decurrent, broad rhomboidal, imbricate, closely appressed, keeled scales, 1.6 (1.3-1.9) mm long, 0.7 (0.6-0.8) mm at widest point. Apex acute, strongly incurved. Margin entire. Cuticle epistomatic, stomata in two distinct zones either side of thin, stomata-free midvein, extending 2/3 leaf length. Apical region stomata-free. Stomata in ordered, closely packed uniseriate rows, parallel to long axis of leaf, rarely separated by more than one epidermal cell width, stomatal zones broad, 4-6 rows wide. Stomata elongate and normally paratetracytic, polar subsidiary cells 2, often shared between adjacent stomata of row, square in outline, granular periclinal wall; lateral subsidiary cells 2-4 sometimes in contact with adjacent subsidiary cells, sometimes shared, shape crescentic, periclinal wall granular. Guard cell cuticle oval in outline, bordered by thickened cuticular rim, lateral extensions absent, polar extensions poorly developed. Stomatal pore rectangular, 11-13 µm long, 2 µm wide, parallel with stomatal rows. Florin ring prominent to indistinct, raised above leaf surface, elongate, smooth. Epidermal cells rectangular, arranged in files parallel with long axis of leaf, longer in non-stomatiferous regions; granular, flat, periclinal walls; thin, smooth, straight anticlinal walls. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Late/Upper Oligocene to the top of the Early/Lower Miocene or 27.30000 to 15.98000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oligocene - Early/Lower Miocene | Australia (Tasmania) | Dacrycarpus acutifolius (167314) |