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Dacrycarpus linifolius
Taxonomy
Dacrycarpus linifolius was named by Wells and Hill (1989) [Type locality. Upper mudstone unit, Little Rapid River.
Specimens examined. LRR1-851, 1174.]. It is considered to be a form taxon. Its type specimen is Holotype. LRR1-851, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil. Its type locality is Little Rapid River 1, which is in an Oligocene fluvial-lacustrine mudstone in Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus linifolius Wells and Hill p. 399 figs. 25-27, 30 |
| 1991 | Dacrycarpus linifolius Hill and Carpenter |
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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 linifolius 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, imbricate, closely appressed, distinctly linear, keeled, 4-5 mm long, 0.5-0.7 mm wide at broadest point, tapering to acute apex, base constricted, 0-2-0.4 mm wide. Margin entire. Apex straight or curved outwards. Cuticle amphistomatic, stomata in four distinct zones, two narrow bands on each side of wide stomata free zone across midvein on both leaf surfaces, nearly extending as far as apex on adaxial surface, but much less than '13 of leaf length on abaxial surface. Stomata in uniseriate rows, sometimes discontinuous or merging with others; rows parallel to longitudinal leaf axis, sometimes with stomata in contact or separated by 1-3 rows of epidermal cells. Stomatal zone 1-3 rows wide. Stomata extremely elongated, paratetracytic; polar subsidiary cells 2, square to rounded, often shared between adjacent stomata of a row; periclinal walls granular; lateral subsidiary cells 2, rarely divided, narrow rectangular to narrow crescent shaped, periclinal walls smooth to granular. Cuticular flange between guard cells and subsidiary cells elongate with distinct polar and lateral extensions, the latter sometimes reaching the opposite wall of lateral subsidiary cell. Subsidiary cell outer anticlinal walls deeper than epidermal cell anticlinal walls. Stomatal pore elongate, 18-25 pm long. Florin ring absent or very indistinct. Epidermal cells rectangular, arranged in longitudinal files, sometimes shorter within stomatiferous zones, granular flat periclinal walls, thin, smooth, sometimes pitted anticlinal walls. Anticlinal walls on abaxial surface often with lateral extensions covering the wall from sight under SEM. | |
| R. S. Hill and R. J. Carpenter 1991 | Foliage uniform, spirally arranged; leaves bifacial, decurrent, imbricate, closely appressed, distinctly linear, keeled, 4-5 mm long, 0.5-0.7 mm wide at broadest point, tapering to acute apex, base constricted, 0.2-0.4 mm wide. Margin entire. Apex straight or curved outwards. Cuticle amphistomatic, stomates in four distinct zones, two narrow bands on each side of wide stomate-free zone across midvein on both leaf surfaces, nearly extending as far as apex on adaxial surface, variable on abaxial surface. Stomates in uniseriate rows, sometimes discontinuous or merging with others; rows parallel to longitudinal leaf axis, sometimes with stomates in contact or separated by 1-3 rows of epidermal cells. Stomatal zone 1-3 rows wide. Stomates extremely elongated, paratetracytic; polar subsidiary cells 2, square to rounded, often shared between adjacent stomates of a row; periclinal walls granular; lateral subsidiary cells 2, rarely divided, narrow rectangular to narrow crescent shaped, periclinal walls smooth to granular. Cuticular flange between guard cells and subsidiary cells elongate with distinct polar and lateral extensions, the latter sometimes reaching the opposite wall of lateral subsidiary cell. Subsidiary cell outer anticlinal walls deeper than epidermal cell anticlinal walls. Stomatal pore elongate, 18-25 µm long. Florin ring absent or very indistinct. Epidermal cells rectangular, arranged in longitudinal files, sometimes shorter within stomatiferous zones, granular flat periclinal walls, thin, smooth, sometimes pitted anticlinal walls. Anticlinal walls on abaxial surface often with lateral extensions covering the wall from sight under SEM. |
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 Oligocene or 55.80000 to 28.40000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Eocene | Australia (Tasmania) | Dacrycarpus linifolius (166977) | |
| Early/Lower Oligocene | Australia (Tasmania) | Dacrycarpus linifolius (type locality: 166705) |