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Oligosporangiopteris zhongxiangii
Oligosporangiopteris zhongxiangii Votočk. Frojd., Jun Wang bis, Pšenička, Bek, Opluštil, Libertín Rev. Palaeobot. Palynol., 294(104479): 3. 25 Jun 2021
- Name
- Oligosporangiopteris zhongxiangii
- Rank
- Species
- Generic Name
- [Genus] Oligosporangiopteris
- Authors (Pub.)
- Votočková Frojdová J.
Wang J.
Pšenička J.
Bek J.
Opluštil S.
Libertín M.
- Publication
- A new leptosporangiate fern Oligosporangiopteris zhongxiangii gen. and sp. nov. from the lowermost Permian of Inner Mongolia, China – morphology, anatomy and reproductive organs [2021/6]
- Journal
- Review of Palaeobotany and Palynology
- Volume
- 294
- Issue
- 104479
- Page number
- 3
- Year
- 2021
- Fossil Status
- foliage (fertile)
- Stratigraphy
- Asselian
- Strat. comment
- Taiyuan Formation
- Location
- Wuda Coal District (N39°28′53′′, E106°38′08′′) near Wuda, Inner Mongolia, China
- Paleoregion
- Cathaysia (North)
Data for Holotypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB22602
Data for Paratypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB22605
- Diagnosis
- Frond segments at least tripinnate; antepenultimate rachis with a bar-shaped, slightly curved xylem strand having slightly curved lateral ends of xylem; four endarch protoxylem strands on concave side: two situated on lateral ends, and two close to lateral ends of xylem strand; penultimate rachis with xylem strand wide, adaxially C-shaped with four protoxylem strands present on adaxial side where two endarch protoxylems groups are situated on lateral ends and two close to lateral ends of xylem strand, secretory cells/cavity spread out close to outer part of cortex similar to those secretory cells/cavity from antepenultimate rachis; pinnules, lanceolate, slightly flared, sporangia pyriform annulate regularly grouped into round or oval sori, up to 18 sori per pinnule, with very short and thick pedicel, having one sporangial cell layer; four types of cells distinguished in sporangium:
(1) thick-walled cells of an incomplete horizontally oblique annulus, (2) thin-walled cells of stomium, (3) single apical cell and (4) ordinary cells; trilete subtriangular microspores with strongly concave amb. The sculpture is microgranulate, microrugulate to reticulate sculpture. Labrum-like thickening along the rays of the trilete mark often developed.
