Topic
Acmopyle
About: Acmopyle is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 135 citations.
Papers
TL;DR: An important 'whole flora' taxonomic treatment of a macrofossil assemblage from Hasties, north-eastern Tasmania, notes the first occurrence in Australia of the conifer Lepidothamus (currently restricted to New Zealand and South America).
Abstract: The Mid–Late Eocene macrofloral assemblage from Hasties, north-eastern Tasmania is characterised by a large diversity of conifers. Fourteen species are identified including two species of Araucaria (A. hastiensis Hill & Bigwood and A. annulata Bigwood & Hill) and 12 species of Podocarpaceae: Acmopyle compactus sp. nov.; Lepidothamnus diemenensis sp. nov.; two species of Dacrycarpus (D. geminus sp, nov. and D. mucronatus Wells & Hill); Phyllocladus aspleniifolius Hook; Podocarpus sinuatus sp. nov.; two species of Prumnopitys (P. portensis sp. nov. and P. cf. P. montana), Smithtonia jonesii Hill & Pole; and three species of uncertain genus. Seven taxa of angiosperm macrofossils (dispersed cuticles and leaves) are identified: two species of Luurophyllum (Lauraceae); Luurophyllum cuspidatus sp. nov. and L. cf. L. arcuatum Hill; Nothofagus tasmanica (Fagaceae); Gymnostoma sp. (Casuarinaceae); Cenarrhenes nitida (Proteaceae), cf. Xanthomyrtus sp. (Myrtaceae); and a taxon of possible Cunoniaceae affinity. The vegetation, which was dominated by Lepidothamnus diemenensis, grew in a floodbasin swamp. The climate was cool, seasonal, with high rainfall and cloud cover. This paper is an important 'whole flora' taxonomic treatment of a macrofossil assemblage. It notes the first occurrence in Australia of the conifer Lepidothamus (currently restricted to New Zealand and South America).
52 citations
TL;DR: Eight genera of conifers in two or three families are documented from Miocene sediments of the Manuherikia Group, Central Otago, New Zealand, and seven species occur in one deposit.
Abstract: Eight genera of conifers in two or three families are documented from Miocene sediments of the Manuherikia Group, Central Otago, New Zealand They include Acmopyle masonu sp nov , Dacrycarpus dacrydioides Lepidothamnus intermedius, Podocarpus sp ‘Mata Creek’, Prumnopitys taxifoha, and Retrophyllum vulcanense in the Podocarpaceae, an indeterminate genus in either the Podocarpaceae or Taxaceae, and a single representative of the Cupressaceae Seven species occur in one deposit
26 citations
TL;DR: Cluster analysis based on the biosynthetic origin of their volatile terpenes led to the description of three distinct groups of essential oils and showed close relationships between those of D. araucarioides and D. balansae as well as between Those of A. pancheri and F. taxoides.
Abstract: Plant secondary metabolites can be useful chemosystematic markers to distinguish species at different taxonomy levels. For example, sesquiterpenes and diterpenes show specific distribution patterns within conifers and so provide especially precious information about the diversity and evolutionary relationships of this group. The aim of the present study was to provide a first insight into the terpene diversity of endemic Podocarpaceae from New Caledonia. The leaf essential oils of Dacrydium araucarioides Brongn. & Gris, Dacrydium balansae Brongn. & Gris, Dacrydium guillauminii J.Buchholz, Dacrydium lycopodioides Brongn. & Gris, Falcatifolium taxoides (Brongn. & Gris) de Laub., and Acmopyle pancheri (Brongn. & Gris) Pilg. from New Caledonia were characterized by GC/FID and GC/MS analyses, and the chemotaxonomic relationships of these species were determined by comparison of their terpene compositions. Cluster analysis based on the biosynthetic origin of their volatile terpenes led to the description of three distinct groups of essential oils and showed close relationships between those of D. araucarioides and D. balansae as well as between those of A. pancheri and F. taxoides.
4 citations
TL;DR: It is hypothesised that during the Tertiary in south-eastern Australia stomatal distribution was reduced on Dacrycarpus and Acmopyle foliage and probably represents convergent evolution in response to climatic change.
Abstract: Macrofossil specimens of Dacrycarpus and Acmopyle from south-eastern Australia are investigated. The specimens previously assigned to D. praecupressinus are revised, with one placed in a different genus and new species, Podocarpus witherdenensis, and some placed in a new species, D. latrobensis. One specimen is retained as the lectotype of D. praecupressinus. Dacrycarpus eocenica is re-examined and it is concluded that this species is not Dacrycarpus, but probably belongs to an extinct podocarpaceous genus. Dacrycarpus setiger is transferred to Acmopyle, and three new Acmopyle species, A. florinii, A. glabra and A. tasmanica, are described. It is hypothesised that during the Tertiary in south-eastern Australia stomatal distribution was reduced on Dacrycarpus and Acmopyle foliage. In Dacrycarpus the bilaterally flattened foliage type (which has a greater photosynthetic area than the bifacially flattened foliage) became rare or extinct after the Early Oligocene, prior to the extinction of the genus in the region. Acmopyle has not been recorded in the region after the Early Oligocene. A trend towards reduction in leaf size at high latitudes has previously been demonstrated in angiosperms but not gymnosperms and, along with the reduction of stomatal distribution, probably represents convergent evolution in response to climatic change.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2015 | 1 |
| 1997 | 1 |
| 1992 | 1 |
| 1991 | 1 |