OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis
Compressed specimens of the fern Osmunda are described from the Triassic of the Allan Hills, Antarctica. The specimens consist of a once pinnate, deeply pinnatifid fertile frond as well as several sterile specimens. Six pinnae are present on the partial fertile rachis, with two sterile pinnae above...
Published in: | American Journal of Botany |
---|---|
Main Authors: | , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1998
|
Subjects: | |
Online Access: | http://dx.doi.org/10.2307/2446424 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2446424 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2446424 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.2307%2F2446424 |
id |
crwiley:10.2307/2446424 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.2307/2446424 2023-12-03T10:14:02+01:00 OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis Phipps, Carlie J. Taylor, Thomas N. Taylor, Edith L. Cúneo, N. Rubén Boucher, Lisa D. Yao, Xuanli National Science Foundation 1998 http://dx.doi.org/10.2307/2446424 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2446424 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2446424 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.2307%2F2446424 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor American Journal of Botany volume 85, issue 6, page 888-895 ISSN 0002-9122 1537-2197 Plant Science Genetics Ecology, Evolution, Behavior and Systematics journal-article 1998 crwiley https://doi.org/10.2307/2446424 2023-11-09T14:26:55Z Compressed specimens of the fern Osmunda are described from the Triassic of the Allan Hills, Antarctica. The specimens consist of a once pinnate, deeply pinnatifid fertile frond as well as several sterile specimens. Six pinnae are present on the partial fertile rachis, with two sterile pinnae above four fertile pinnae. Both sterile and fertile specimens are virtually identical to the modern species Osmunda claytoniana . Entire fronds are fragmentary; the longest is 21 cm in length. Sterile pinnae are alternate and deeply pinnatifid, with slightly toothed pinnules and dichotomous venation. Fertile pinnae are 1–1.3 cm long, once pinnate, and lack vegetative lamina. Sporangia are clustered, each 300–375 µm in diameter, and possess a transverse annulus 6–8 cells long; dehiscence is by a vertical slit. Fronds arise from a rhizome 4 cm long by 1 cm wide; two croziers are present on the rhizome. Two frond segments up to 6 cm long and three deeply pinnatifid pinnae are present on the uppermost part of one rachis. Pinnules are ~4 mm long and 2–3 mm wide. The presence of this Osmunda species in the Triassic demonstrates stasis of frond morphology, both fertile and vegetative, for the genus. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library (via Crossref) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) American Journal of Botany 85 6 888 895 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Plant Science Genetics Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Plant Science Genetics Ecology, Evolution, Behavior and Systematics Phipps, Carlie J. Taylor, Thomas N. Taylor, Edith L. Cúneo, N. Rubén Boucher, Lisa D. Yao, Xuanli OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
topic_facet |
Plant Science Genetics Ecology, Evolution, Behavior and Systematics |
description |
Compressed specimens of the fern Osmunda are described from the Triassic of the Allan Hills, Antarctica. The specimens consist of a once pinnate, deeply pinnatifid fertile frond as well as several sterile specimens. Six pinnae are present on the partial fertile rachis, with two sterile pinnae above four fertile pinnae. Both sterile and fertile specimens are virtually identical to the modern species Osmunda claytoniana . Entire fronds are fragmentary; the longest is 21 cm in length. Sterile pinnae are alternate and deeply pinnatifid, with slightly toothed pinnules and dichotomous venation. Fertile pinnae are 1–1.3 cm long, once pinnate, and lack vegetative lamina. Sporangia are clustered, each 300–375 µm in diameter, and possess a transverse annulus 6–8 cells long; dehiscence is by a vertical slit. Fronds arise from a rhizome 4 cm long by 1 cm wide; two croziers are present on the rhizome. Two frond segments up to 6 cm long and three deeply pinnatifid pinnae are present on the uppermost part of one rachis. Pinnules are ~4 mm long and 2–3 mm wide. The presence of this Osmunda species in the Triassic demonstrates stasis of frond morphology, both fertile and vegetative, for the genus. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Phipps, Carlie J. Taylor, Thomas N. Taylor, Edith L. Cúneo, N. Rubén Boucher, Lisa D. Yao, Xuanli |
author_facet |
Phipps, Carlie J. Taylor, Thomas N. Taylor, Edith L. Cúneo, N. Rubén Boucher, Lisa D. Yao, Xuanli |
author_sort |
Phipps, Carlie J. |
title |
OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
title_short |
OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
title_full |
OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
title_fullStr |
OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
title_full_unstemmed |
OSMUNDA (OSMUNDACEAE) FROM THE TRIASSIC OF Antarctica: an example of evolutionary stasis |
title_sort |
osmunda (osmundaceae) from the triassic of antarctica: an example of evolutionary stasis |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.2307/2446424 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2446424 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2446424 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.2307%2F2446424 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) |
geographic |
Allan Hills |
geographic_facet |
Allan Hills |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
American Journal of Botany volume 85, issue 6, page 888-895 ISSN 0002-9122 1537-2197 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/2446424 |
container_title |
American Journal of Botany |
container_volume |
85 |
container_issue |
6 |
container_start_page |
888 |
op_container_end_page |
895 |
_version_ |
1784261084194013184 |