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Dacrycarpus mucronatus
Taxonomy
Dacrycarpus mucronatus was named by Wells and Hill (1989) [Type locality. Lower mudstone unit, Little Rapid River.
Specimens examined: LRR2-041-044.]. It is considered to be a form taxon. Its type specimen is Holotype. LRR2-044, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil. Its type locality is Little Rapid River 2, which is in an Oligocene lacustrine mudstone/sandstone in Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus mucronatus Wells and Hill p. 391 figs. 2,4-6 |
| 1991 | Dacrycarpus mucronatus Hill and Carpenter |
| 1992 | Dacrycarpus mucronatus Pole |
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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 mucronatus 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, narrow to falcate, decurrent, imbricate, appressed, strongly keeled, 1.9 (1.3-2.7) mm long, 0.4 (0-3-0.5) mm wide, apex mucronate, incurved. Leaf base contracted, about 0.2 mm wide. Margins entire. Cuticle amphistomatic; stomata in four distinct zones, two narrow bands either side of midvein on both surfaces, extending to apex on adaxial surface. Stomata in uniseriate rows, sometimes disordered or discontinuous or merging with others, rows parallel with long axis of leaf and typically separated by 1-3 epidermal cells; stomata absent near leaf margin, across midvein, across abaxial surface. Stomata1 zone 1-4 rows wide (typically 2-3). Stomata unequally amphicyclic, encircling cells usually missing from polar regions, often spanning adjacent subsidiary cells in lateral regions; polar subsidiary cells typically shared between adjacent stomata in a row, square or rounded with smooth anticlinal walls or granular periclinal walls; lateral subsidiary cells crescentic with a thick band of cuticle displaying prominent lateral and
polar extensions adjacent to the guard cell, periclinal walls granular to smooth. Polar subsidiary cells 2, lateral subsidiary cells 2-4. Stomatal apparatus normally ovate, sometimes irregular. Stomatal pore elongate, orientation parallel to the long axis of the leaf, 20 x 7 pm. Florin ring indistinct, sunken below leaf surface. Epidermal cells within stomatiferous zones square to rectangular, irregular, shorter than non-stomatiferous epidermal cells. Non-stomatiferous epidermal cells are narrow parallelograms forming rows parallel to long axis of leaf, anticlinal walls thin, smooth, sometimes pitted, periclinal walls flat, granular. | |
| R. S. Hill and R. J. Carpenter 1991 | Bifacially flattened leaves spirally arranged, narrow to falcate, decurrent, imbricate, appressed, strongly keeled, 1.9 (1.3-2.7) mm long, 0-4 (0.3-0.5) mm wide, apex mucronate, incurved. Leaf base contracted, about 0.2 mm wide. Margins entire. Cuticle amphistomatic; stomates in four distinct zones, two arrow bands either side of midvein on both surfaces extending to apex on adaxial surface. Stomates in uniseriate rows, sometimes
disordered or discontinuous or merging with others, rows parallel with long axis of leaf and typically separated by 1-3 epidermal cells; stomates absent near leaf margin, across midvein, across abaxial surface. Stomatal zone 1-4 rows wide (typically 2-3). Stomates unequally amphicyclic, encircling cells usually missing from polar regions, often spanning adjacent subsidiary cells in lateral regions; polar subsidiary cells typically shared between adjacent stomates in a row, square or rounded with smooth anticlinal walls or granular periclinal walls; lateral subsidiary cells crescentic with a thick band of cuticle displaying prominent lateral and polar extensions adjacent to the guard cell, periclinal walls granular to smooth. Polar subsidiary cells 2, lateral subsidiary cells 2-4. Stomatal apparatus normally ovate, sometimes irregular. Stomatal pore elongate, orientation parallel to the long axis of the leaf, 20 x 7 µm. Florin rings indistinct, sunken below leaf surface. Epidermal cells within stomatiferous zones square to rectangular, irregular, shorter than non-stomatiferous epidermal cells. Non-stomatiferous epidermal cells are narrow parallelograms forming rows parallel to long axis of leaf, anticlinal walls thin, smooth, sometimes pitted, periclinal walls flat, granular. Distichous leaves, if present, bilaterally flattened, falcate, decurrent, strongly keeled with a single vein. Leaf length:width ratio about 5:1. Leaves amphistomatic, with two longitudinal stomata1 bands occurring with approximately equal frequency from leaf base to apex on each surface. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Early/Lower Eocene to the top of the Early/Lower Miocene or 56.00000 to 15.98000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Eocene | Australia (Tasmania) | Dacrycarpus mucronatus (166977) | |
| Middle Eocene - Late/Upper Eocene | Australia (Tasmania) | Dacrycarpus mucronatus (166978 167310) | |
| Early/Lower Oligocene | Australia (Tasmania) | Dacrycarpus mucronatus (166832) | |
| Late/Upper Oligocene | Australia (Tasmania) | Dacrycarpus mucronatus (type locality: 167317) | |
| Early/Lower Miocene | Australia (Victoria) | Dacrycarpus mucronatus (169044) |