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Nothofagus mucronata
Taxonomy
Nothofagus mucronata was named by Hill (1991) [Specimens examined: LRR1-066, 067, 197, 229, 252, 1926-1928]. It is not extant. It is considered to be a form taxon. Its type specimen is LRR1-066, a leaf. Its type locality is Little Rapid River 1, which is in an Oligocene fluvial-lacustrine mudstone in Australia.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1991 | Nothofagus mucronata Hill p. 94 figs. 15, 16, 19-21 |
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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.
†Nothofagus mucronata Hill 1991
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. S. Hill 1991 | Leaf symmetrical, obovate. Leaf length 3.2-5.4 cm, width 1.0-1-8 cm. Leaf apex rounded or slightly retuse, with a mucronate tip; base acute. Leaf margin serrate in apical half, serrations of one order, variable in size and morphology of the specimens. Where present there is one serration per secondary vein. Venation brochidodromous where serrations are absent (basal half), semicraspedodromous where serrations are present (apical half) with about 18 secondary veins arising at a uniform angle from the primary vein and following a curved course. Intersecondary veins weakly developed. Tertiary veins vere weakly percurrent or random reticulate. Upper epidermal cells heavily cutinized, with well-developed cuticular flanges. Venous cells longer and narrower than non-venous cells and clearly outlining the areolas. Trichomes absent from upper epidermis. Lower epidermal cells thinly cutinized, irregular. Venous cells more heavily cutinized and more regular in arrangement. Stomatal size extremely variable, stomates randomly arranged, but usually confined to areoles. Giant stomates present over veins. Large glandular trichomes common over veins. Other trichomes absent. Lower epidermis coated with a thick layer of wax,which forms distinct rings around the stomatal openings. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Age range: Early/Lower Oligocene or 33.90000 to 28.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Oligocene | Australia (Tasmania) | Nothofagus mucronata (type locality: 166705) |