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Fossil Fungi with Suggested Affinities to the Endogonaceae from the Middle Triassic of Antarctica

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Fossil Fungi with Suggested Affinities to the Endogonaceae from the Middle Triassic of Antarctica KU ScholarWorks | http://kuscholarworks.ku.edu Please share your stories about how Open Access to this article benefits you. Fossil fungi with suggested affinities to the Endogonaceae from the Middle Triassic of Antarctica by Michael Krings. Thomas N. Taylor, Nora Dotzler, and Gianna Persichini 2012 This is the published version of the article, made available with the permission of the publisher. The original published version can be found at the link below. [Citation] Published version: http://www.dx.doi.org/10.3852/11-384 Terms of Use: http://www2.ku.edu/~scholar/docs/license.shtml KU ScholarWorks is a service provided by the KU Libraries’ Office of Scholarly Communication & Copyright. Mycologia, 104(4), 2012, pp. 835–844. DOI: 10.3852/11-384 # 2012 by The Mycological Society of America, Lawrence, KS 66044-8897 Fossil fungi with suggested affinities to the Endogonaceae from the Middle Triassic of Antarctica Michael Krings1 INTRODUCTION Department fu¨ r Geo- und Umweltwissenschaften, Pala¨ontologie und Geobiologie, Ludwig-Maximilians- Documenting the evolutionary history of fungi based Universita¨t, and Bayerische Staatssammlung fu¨r on fossils is generally hampered by the incompleteness Pala¨ontologie und Geologie, Richard-Wagner-Straße 10, of the fungal fossil record (Taylor et al. 2011). Only a 80333 Munich, Germany, and Department of Ecology few geologic deposits have yielded fungal fossils and Evolutionary Biology, and Natural History preserved in sufficient detail to permit assignment to Museum and Biodiversity Research Institute, University of Kansas, Lawrence, Kansas 66045 any one of the major lineages of fungi with any degree of confidence. Perhaps the most famous of these Thomas N. Taylor deposits is the Lower Devonian (ca. 410 000 000 y ago) Department of Ecology and Evolutionary Biology, and Rhynie chert, which has been instrumental in our Natural History Museum and Biodiversity Research conception of fungi in early continental ecosystems Institute, University of Kansas, Lawrence, Kansas 66045 (Taylor et al. 2004). Other well preserved fungi occur in Carboniferous (359 000 000–299 000 000 y ago) Nora Dotzler chert and coal balls (e.g. Taylor et al. 1994, 2005; Gianna Persichini Krings et al. 2007, 2009, 2010, 2011; Dotzler et al. Department fu¨ r Geo- und Umweltwissenschaften, 2011), as well as in Triassic (251 000 000–199 000 000 y Pala¨ontologie und Geobiologie, Ludwig-Maximilians- ago) permineralized peat from Antarctica (e.g. Stub- Universita¨t, Richard-Wagner-Straße 10, 80333 Munich, Germany blefield et al. 1987, White and Taylor 1988, Osborn and Taylor 1989, Taylor and White 1989, Phipps and Taylor 1996, Schwendemann et al. 2011). Abstract: Documented fossil evidence of zygomyce- The record of fungi from Triassic peat deposits in tous fungi is rare. A conspicuous fungal fossil, Antarctica includes several types of sporocarps and Jimwhitea circumtecta gen. et sp. nov., occurs in isolated sporangia/spores that have been suggested as permineralized peat from the Middle Triassic of belonging to the zygomycetous fungi, order Endogo- Antarctica. The fossil is interpreted as a mantled nales. This assignment is based on sporocarp and/or zygosporangium that buds from a macrogametan- spore size, the presence of a hyphal mantle and/or gium subtended by a sac-like macrosuspensor. The structures interpreted as suspensor cells or gametan- macrogametangium is united at its tip with a gia (Taylor and White 1989; White and Taylor 1989, 1991). These fossils are especially significant because microgametangium which is subtended by a micro- documented fossil evidence of zygomycetes is exceed- suspensor. This configuration is strikingly similar to ingly rare (Taylor et al. 2009). However, at the time the zygosporangium-gametangia complexes seen in these fossils were described, the Endogonales also still certain modern Endogonaceae. Co-occurring with J. included the fungi that today are accommodated in circumtecta are isolated propagules closely resembling the Glomeromycota (Morton and Benny 1990, the zygosporangium of J. circumtecta and a portion of Schu¨ßler et al. 2001, White et al. 2006). Most of the a sporocarp containing zygosporangia embedded in a fossils described and illustrated by Taylor and White gleba. Several of the sporangia are borne on ovoid or (1989) and White and Taylor (1989, 1991) do not elongate structures, which we interpret as gametan- display the sexual stage of the life cycle (i.e. gia. These fossils offer an exceptionally detailed view zygosporogenesis following gametangial fusion; see of the morphology and reproductive biology of early Benjamin 1979, Benny et al. 2001) in sufficient clarity Mesozoic zygomycetes. to allow assignment to the Endogonales with confi- Key words: Endogone, Fremouw Formation, gam- dence as currently interpreted. As a result, more etangium, hyphal mantle, Jimwhitea circumtecta, per- completely preserved specimens are needed to mineralized peat, sporocarp, zygosporangium accurately assess the fossil record of Endogonales from the Triassic of Antarctica. This paper describes Jimwhitea circumtecta gen. et sp. nov., a newly discovered fungus from the Middle Submitted 17 Nov 2011; accepted for publication 10 Jan 2012. Triassic (245 000 000–228 000 000 y ago) Fremouw 1 Corresponding author. E-mail: [email protected] Formation in the central Transantarctic Mountains 835 836 MYCOLOGIA that is interpreted as a mantled zygosporangium Jimwhitea M. Krings et T.N. Taylor, gen. nov. budding from a macrogametangium, which is fused at MycoBank MB563662 the tip with a microgametangium. The fossil is Fossil zygomycetous sexual reproductive structure (zygos- strikingly similar to the zygosporangium-gametangia porangium-gametangia complex); zygosporangium with complexes in certain modern Endogonaceae (Endo- hyphal mantle; gametangia apposed, differentiated (macro- gonales). Co-occurring with J. circumtecta in the rock gametangium and macrosuspensor distinctly larger than microgametangium and microsuspensor), fused at their matrix are isolated propagules that are very similar to tips; zygosporangium budding from macrogametangium. the zygosporangium of J. circumtecta, as well as part of Type species. Jimwhitea circumtecta M. Krings et T.N. a sporocarp containing several zygosporangia at- Taylor (this paper). tached to gametangia. The discovery of these fossils Etymology. Jimwhitea is proposed in honor of Dr is important because they substantiate the hypothesis James (Jim) F. White Jr, Rutgers University, New that at least some of the fossils described by Taylor Brunswick, New Jersey, for his contributions to our and White (1989), and White and Taylor (1989, 1991) understanding of the biodiversity of Triassic fungi are in fact endogonalean sexual reproductive struc- from Antarctica; circumtecta (Lat.: circumtectus, -a, -um tures. Moreover, these fossils provide important 5 covered round about) refers to the hyphal mantle evidence needed to discuss the evolution of certain sheathing the zygosporangium. life cycle stages in zygomycetous fungi. Jimwhitea circumtecta M. Krings et T.N. Taylor, sp. MATERIALS AND METHODS nov. FIG.1A–C The fossils occur in permineralized peat from the Fremouw MycoBank MB563663 Formation in the central Transantarctic Mountains. The Zygosporangium globose to subglobose to broadly ellip- Fremouw Formation is a 620–750 m thick sequence that was soid, (60–)70–90 mm diam (including mantle), with deposited by low sinuosity, braided streams (Barrett et al. prominent, one-layered mantle (up to 20 mm thick) of 1986). Permineralized peat is found at a single locality, irregularly swollen, tightly interlaced, aseptate hyphae; approximately 30 m below the top of the formation. Blocks zygosporangium wall recognizable as narrow dark line of permineralized peat likely were rafted into their current extending along inner surface of mantle; gametangia position during a flood that caused them to be stranded on arising from meshwork of irregularly swollen, tightly sand bars (Taylor et al. 1989). The silica source for the interlaced hyphae (gleba); macrogametangium thin-walled, permineralization was the dissolution of siliceous, volcanic separated from inflated, sac-like macrosuspensor by septum; detritus that was abundant in the Upper Fremouw microgametangium less than half the size of macrogame- Formation. The peat block containing the fungal remains tangium, subtended by hypha-like microsuspensor. was collected from a saddle north of Fremouw Peak in the Holotype. Specimen (illustrated in FIG. 1A, left side Queen Alexandra Range of the Transantarctic Mountains of image; slide 26 594) deposited in the Paleobotany (Barrett and Elliot 1973). The peat has been dated as early Division, Natural History Museum and Biodiversity Middle Triassic based on palynomorphs and nearby Institute, University of Kansas, Lawrence, Kansas. vertebrate fossils (Farabee et al. 1990, Hammer et al. 1990). Collection locality. Fremouw Peak, Queen Alexandra The fossils were identified in series of eight thin sections, Range of the central Transantarctic Mountains, each approximately 100 mm thick, prepared from a single Antarctica (84u179410S, 164u219480E). block of permineralized peat (,4.5 3 3.0 3 2.5 cm) by cementing thin wafers of the block to glass slides and Stratigraphic position. Fremouw Formation, Beacon grinding the wafers with silicon carbide powder until the Supergroup. rock slice is sufficiently thin to transmit light. Slides are Age. Middle Triassic. deposited in the Paleobotany Division, Natural
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