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Estinnophyton yunnanense
Estinnophyton yunnanense S.-G. Hao, De-M. Wang, Q. Wang Bot. J. Linn. Soc., 146(2): 202. 6 Oct 2004
- Name
- Estinnophyton yunnanense
- Rank
- Species
- Generic Name
- [Genus] Estinnophyton
- Authors (Pub.)
- Hao S.-G.
Wang D.-M.
Wang Q.
- Publication
- A new species of Estinnophyton from the Lower Devonian Posongchong Formation, Yunnan, China; its phylogenetic and palaeophytogeographical significance [2004/10]
- Journal
- Botanical Journal of the Linnean Society
- Volume
- 146
- Issue
- 2
- Page number
- 202
- Year
- 2004
- Fossil Status
- stems (with sporophylls)
- Stratigraphy
- Pragian
- Location
- Mountain outcrop approximately 200 m west of Zhichang village, Gumu Town, Wenshan District, Yunnan Province, China
- Paleoregion
- Cathaysia (South)
Data for Holotypus
- Repository
- Beijing University, Department of Geology, Beijing, China
- Repository Number
- BUH-Es.01
- Diagnosis
- STEMS slender, 1.1–(2.6)-4.0 mm wide (N = 18), isotomously branching at angles of 30–50∞. Rounded or narrowly oval protuberances or depressions, representing leaf bases, alternately arranged in a low spiral or pseudowhorled pattern, three to six of each gyre. Sometimes decurrent bases connect with ridges, due to preservational crushing. VEGETATIVE LEAVES persistent attached on the axis at various angles, from acute to approximately right angles. Successive distance between (leaf) gyres 2.0–(2.8)- 3.5 mm (N = 24). Leaves 3.3–(4.2)-5.0 mm long (N = 28) and 0.4–(0.6)-0.8 mm wide (N = 16) at base, once or closely twice bifurcate, branching c. 3/5 from the base, the resulting segments diverging at angles of 60–70∞. Ultimate segments 0.8–(1.3)-1.8 mm long (N = 28) and about 0.1–0.2 mm wide, tapering to expanded oblate or truncated apices. FERTILE LEAVES with two stalked and recurved sporangia, borne adaxially on either side below or near the division of the once bifurcate leaf, or below the points of successive divisions in a twice bifurcate leaf. SPORANGIA ovoid-elongate, 1.5–(1.8)–2.0 (N = 32) mm long and 0.6–(0.7)–0.8 mm wide (N = 26). Sporangial stalks 0.3–(0.5)-0.7 mm long (N = 12) and c. 0.2 mm wide. ISOSPORES with subtriangular amb, 16–(21)-25 mm in diameter (N = 36). Trilete rays simple, extending to 1/2–2/3 of the radius.
