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Palaeostachya guanglongii
Palaeostachya guanglongii Lu Liu, Pšenička, Bek, M. Wan, Pfefferk., Jun Wang bis Rev. Palaeobot. Palynol., 2020, 294(104245): 3. 30 Apr 2020
- Name
- Palaeostachya guanglongii
- Rank
- Species
- Generic Name
- [Genus] Palaeostachya
- Authors (Pub.)
- Liu Lu.
Pšenička J.
Bek J.
Wan M.
Pfefferkorn H. W.
Wang J.
- Publication
- A whole calamitacean plant Palaeostachya guanglongii from the Asselian (Permian) Taiyuan Formation in the Wuda Coalfield, Inner Mongolia, China [2020/4]
- Journal
- Review of Palaeobotany and Palynology
- Annee/Jahrgang
- 2020
- Volume
- 294
- Issue
- 104245
- Page number
- 3
- Year
- 2020
- Fossil Status
- strobili
- Stratigraphy
- Asselian
- Location
- Wuda Coal District (N39°28′53′′, E106°38′08′′) near Wuda, Wuhai, Inner Mongolia, P.R. China
- Paleoregion
- Cathaysia (North)
Data for Holotypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB22924
Data for Paratypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB22313 (Fig. 3A) and PB22907 (Fig. 3B) showing stem
bifurcating into two major branches; PB22315b (Fig. 4D) showing
stem anatomy; PB22912 (Fig. 4G) showing compressed pith cast.
PB22310 (Fig. 2A) showing ultimate branches. PB22316 (Fig. 2B) and
PB22924 (Fig. 2D) showing ultimate branches with both leaf and strobilus.
PB22319 (Fig. 2C), PB22317 (Fig. 2E) and PB22916 (Fig. 2F) showing
well-preserved strobili; PB22918 (Fig. 5F) showing attachment of
sporangia to sporangiophore head; PB22320 (Fig. 5I, J) showing attachment
of sporangiophore to strobilus axis.
- Num
- 2 A. B, C, D, E, F, 3 A, B, 4 D, G, 5 F, I, J
- Pub.
- A whole calamitacean plant Palaeostachya guanglongii from the Asselian (Permian) Taiyuan Formation in the Wuda Coalfield, Inner Mongolia, China [2020/4]
- Diagnosis
- Stem bifurcated into two major branches bearing both vegetative leaves and strobili. Internodes length shorter than width on the stem and major branch, but much longer than width on the ultimate branch bearing vegetative leaf or both leaf and strobilus. Ribs on stem, major and ultimate branches straight, alternative or passing through the nodes. Strobili cylindrical, 5–10 mm wide, up to 5 cm long, and consisting of 11–20 internodes. Ratio of diameter to internode length 2–3. Bract and sporangiophore whorls alternately arranged. A peduncle 2-mm-long connects to the nodes at the proximal end of each strobilus. The strobilus axis 0.5 mm in width and its internodes up to 2 mm in length; the axis slightly swollen at the nodes. Sixteen bracts per whorl extending outward and then upward as far as half of an internode. Bracts slightly overlapping each other. Four sporangiophores per whorl, arising obliquely and slightly above the bract whorls, with umbrella-like sporangiophore head. Each sporangiophore bearing 4 sporangia (1.3–1.5 mm × 0.7–1 mm × 0.75 mm). Four sporangia arranged as proximal and distal pairs. Sporangia ovoid to elongateovoid, with a set of spores 26–79 μm (avg. 56 μm) in diameter and, another set of 92–198 μm (avg. 136.8 μm) in diameter. Spores trilete circular to oval laevigate, with secondary folds of exine.
