Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/61191
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Type: Journal article
Title: Early Oligocene Callitris and Fitzroya (Cupressaceae) from Tasmania
Author: Paull, R.
Hill, R.
Citation: American Journal of Botany, 2010; 97(5):809-820
Publisher: Botanical Soc Amer Inc
Issue Date: 2010
ISSN: 0002-9122
1537-2197
Statement of
Responsibility: 
Rosemary Paull and Robert S. Hill
Abstract: This paper documents Early Oligocene fossilized foliage and ovulate cones from Lea River, Tasmania and identifi es them as belonging to two extant southern hemisphere Cupressaceae genera, Callitris and Fitzroya. Most importantly, it sheds some light on evolutionary trends within Callitris , a genus with numerous extant Australian species and two extant New Caledonian species. Callitris has a very poor fossil record and, because of the present absence of a molecular data set that includes all species, its phylogeny remains somewhat ambiguous. Although Fitzroya foliage has previously been described from a number of Tasmanian sites, this is the fi rst recording of fertile material. The ovulate cones of the Callitris and Fitzroya macrofossils are characterized by bract-scale complexes in two whorls of three and are subtended by scale-like leaves in whorls of three. The fossilized foliage specimens consist of scale-like leaves in whorls of three. These morphological characteristics are only exhibited by three extant southern hemisphere cupressaceous genera, Callitris , Actinostrobus , and Fitzroya . The assignment of the fossils to extinct Callitris and Fitzroya species is made by comparisons with species from these three extant genera. Although much of the Lea River fl ora are wet rainforest taxa, the Callitris fossils have characteristics of both wet- and dry-adapted extant species.
Keywords: Australia; Callitris; Cupressaceae; Early Oligocene; evolution; Fitzroya; macrofossils; morphology; ovulate cones; rainforests
Rights: © 2010 Botanical Society of America
RMID: 0020097239
DOI: 10.3732/ajb.0900374
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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