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Gleichenia
Gleichenia microphylla, Mornington Peninsula, Victoria
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Gleicheniales
Family:	Gleicheniaceae
Genus:	Gleichenia Sm.
Type species
Gleichenia polypodioides (L.) Smith
Species
See text
Synonyms
Calymella K.B.Presl 1836 Gleicheniastrum K.B.Presl 1847

Gleichenia is a genus of ferns. Its closest relative is the genus Stromatopteris, restricted to New Caledonia.

Description

These ferns have creeping rhizomes. The compound eaves fork multiple times, with the final leaf lobes ending in a pinnate arrangement. The sori are found at the bottom of the leaves and are made of a few sporangia. They are not covered by an indusium (protective covering). The sori occur in a unique chamber in the laminar pits - a feature found only in this genus.

Fossil record

The fossil record indicates that this genus had emerged by the late Jurassic period, although it was far more common in the early Cretaceous period. There is some evidence that it may have emerged even earlier - in the upper Triassic period. There are, however, multiple genera in the fossil record that show a similar leaf branching pattern to Gleichenia, which can make it difficult to determine the exact identity of a specimen that does not have adequately preserved fruiting bodies.

Fossils have been found in across a wide geographic range including:

• The Pariwar formation in India (Jurassic-Cretaceous boundary)
• Gardeshwar in India (early Cretaceous)
• The Silty Beds of Bedfordshire in England (early Albian age, early Cretaceous).
• The USA (Cretaceous)
• New South Wales, Australia (Miocene epoch, Neogene period)

Species

The following species are recognised as of February 2023:

Phylogeny of Gleichenia

Unassigned species:

• Gleichenia alstonii Holttum
• Gleichenia elongata Baker
• Gleichenia matthewii Holttum
• Gleichenia paleacea (Copel.) Holttum
• Gleichenia peltophora Copel.
• Gleichenia ×punctulata Colenso
• Gleichenia vulcanica Blume

References

1. ^ "Gleichenia". Global Biodiversity Information Facility. Retrieved 22 February 2023.
2. ^ "Genus Gleichenia". PlantNET - New South Wales Flora Online. Royal Botanic Gardens & Domain Trust, Sydney Australia. Retrieved 2009-01-26.
3. Pryer, K. M., E. Schuettpelz, P. G. Wolf, H. Schneider, A. R. Smith, and R. Cranfill (2004). Phylogeny and Evolution of Ferns (Monilophytes) with a Focus on the Early Leptosporangiate Divergences. American Journal of Botany 91 (10): 1582–98.
4. Levyns, M.R. (1966). A Guide to the Flora of the Cape Peninsula (2nd Revised ed.). Juta & Company, Limited. OCLC 621340.
5. ^ Cantrill, David J.; Ohlsen, Daniel; McCurry, Matthew R.; Frese, Michael (2023-03-01). "Gleichenia nagalingumiae sp. nov., a remarkably well-preserved fossil species with in situ spores from the Miocene of Australia". Review of Palaeobotany and Palynology. 310: 104823. Bibcode:2023RPaPa.31004823C. doi:10.1016/j.revpalbo.2022.104823. ISSN 0034-6667. S2CID 254620225.
6. Bose, M.N.; Kumaran, K.P.N.; Baneiji, J. (1982). "Pachypteris haburensisn. sp. and other plant fossils from the Pariwar Formation". Palaeobotanist. 30 (1): 1–11.
7. ^ Knowlton, Frank Hall (1913). "Description of a new fossil fern of the genus Gleichenia from the Upper Cretaceous of Wyoming" (PDF). Proceedings of the United States National Museum. 45 (1994): 555–558. doi:10.5479/si.00963801.45-1994.555.
8. Vera, Ezequiel I.; Passalia, Mauro G. (2012). "Korallipteris, a new genus for Mesozoic Gleichenia-like fern fronds". Geobios. 45 (4): 421–428. Bibcode:2012Geobi..45..421V. doi:10.1016/j.geobios.2011.09.002. hdl:11336/68155.
9. Jana, Brajendra Nath; King, Sarah C.; Hilton, Jason (2013-09-05). "Revision of the Cretaceous fossil plant-assemblage from Gardeshwar (Gujarat, India): A conifer dominated floral association from an Upper Gondwana sequence on the West Coast of India". Journal of Asian Earth Sciences. 73: 128–138. Bibcode:2013JAESc..73..128J. doi:10.1016/j.jseaes.2013.04.021. ISSN 1367-9120.
10. Herendeen, Patrick S.; Skog, Judith E. (1998). "Gleichenia chaloneri-a New Fossil Fern from the Lower Cretaceous (Albian) of England". International Journal of Plant Sciences. 159 (5): 870–879. doi:10.1086/297609. ISSN 1058-5893. S2CID 84898595.
11. "Helechos". Enciclopedia de la Flora Chilena. Retrieved 2013-03-26.
12. Hassler, Michael (2004–2023). "Gleichenia Smith". World Plants: Synonymic Checklist and Distribution of the World Flora. 15.1. Retrieved 2023-03-08.
13. Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi:10.3389/fpls.2022.909768. PMC 9449725. PMID 36092417.
14. "Tree viewer: interactive visualization of FTOL". FTOL v1.6.0 . 2024. Retrieved 17 August 2024.

External links

• Smith's original description of the genus online at Project Gutenberg

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