Temporal range: Lower Devonian–Middle Devonian
Orestovia is a lower-middle Devonian thallophyte known from fossilised cuticle, cutinite. Described as an enigmatic taxa, Orestovia has variously been categorised as a brown algae, an algae of unknown affinities, a thalloid non-vascular plant, and an early vascular plant, or even the result of the alteration of generations of some other group.
Orestovia are typically found as paper coals. Individual remains are naked, unbranched, cutinised axes up to 20 cm in length and 2 cm wide, tapering distally. Most specimens are preserved as hollow, cuticular sheaths that often exhibit an epidermis-like cellular pattern. The cuticles bear structures which have been described as representing stomata. Spores are sometimes preserved between its layers of cuticle. A reconstruction looks similar to the extant fern Pilularia globulifera (Marsileaceae) in the water with a creeping rhizome and naked, upright axes.
Orestovia remains have been documented from the following locations, In Russia: Pavlovsk, Voronezh Oblast, Graham Bell Island, Arctic Ocean and the Kuznetsk Basin, Siberia. In China: Luquan, Yunnan.
- Snigirevskaya, N.S.; Nadler, Y.S. (1994), "Habitat and Relationships of Orestovia (middle Devonian).", Palaeontographica Abteilung B-Stuttgart-, 233: 11–11
- Krassilov, V. (1981). "Orestovia and the origin of vascular plants". Lethaia. 14: 235. doi:10.1111/j.1502-3931.1981.tb01693.x.
- Krings, Thomas N. Taylor, Edith L. Taylor, Michael (2009). Paleobotany : the biology and evolution of fossil plants (2nd ed.). Amsterdam: Academic Press. p. 186. ISBN 9780123739728.
- Gensel, P.G.; Johnson, N.G. (1994), "… the cuticular structure and stomatal organization of Orestovia sp. Cf. O. Petzii from the Kuznetsk …", Palaeontographica Abteilung B-Stuttgart-, 233
- Volkova, I. B.; Bekh-Ivanov, D. E.; Sidorova I. N. (2001). "New Find of Cuticular Coal in the Franz Josef Land". Lithology and Mineral Resources. 36 (2): 187–190. doi:10.1023/A:1004834703202.
- Dawei, Sun; Wang Yi; Xu Honghe; Fu Qiang (2007). "Restudy On The Cuticles Of Late Middle Devonian Coal From Luquan, Yunnan, China". Acta Palaeontologica Sinica. 46 (3): 355–364. Retrieved 13 April 2012.
- Saint Petersburg State Mining University. Specimen accession with image. http://www.spmi.ru/node/3370 (Russian)
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