Dorsalistachya quadrisegmentorum

Name

Dorsalistachya quadrisegmentorum

Rank

Species

Generic Name

[Genus] Dorsalistachya

Authors (Name)

Wang S.-J. Spencer A. R. T.  

Authors (Pub.)

Wang S.-J. Bateman R. M. Spencer A. R. T. Wang J. Shao L.-Y. Hilton J.  

Publication

Anatomically preserved “strobili” and leaves from the Permian of China (Dorsalistachyaceae, fam. nov.) broaden knowledge of Noeggerathiales and constrain their possible taxonomic affinities [2017/1]

Journal

American Journal of Botany

Volume

104

Issue

1

Page number

13

Year

2017

Fossil Status

cones

Stratigraphy

Lopingian

Strat. comment

Xuanwei Formation

Location

Huopu coal mine, Guizhou Province, southwestern China

Paleoregion

Cathaysia (South)

Data for Holotypus

Repository

Institute of Botany, Chinese Academy of Sciences, Beijing, China

Repository Number

HP2007-1-A (slabs HP2007-1 B–F; serial wafers from slab HP2007-1 C; acetate peels in transverse, tangential, and median longitudinal sections from slab HP2007-1E)

Num

Figures 3–11

Pub.

Anatomically preserved “strobili” and leaves from the Permian of China (Dorsalistachyaceae, fam. nov.) broaden knowledge of Noeggerathiales and constrain their possible taxonomic affinities [2017/1]

Diagnosis

Strobilus slender, cylindrical, ca 10 mm in diameter. Vascular bundle of axis inverted Ω -shaped in transverse section; metaxylem tracheids with scalariform thickenings; several longitudinal secretory cavities within cortex. Sporophylls divided into four vertically aligned segments that undergo one further division before curving upwards. Proximal portion of sporophyll horizontal, semicircular; medial portion dichotomous; distal portion lanceolate, concave, upturned but with downward projection. Sporophylls bearing four microsporangia occasionally also one megasporangium. Microsporangia radially elongated. Microspores trilete, unornamented. Megasporangia with well-developed wings, organized in short vertical rows randomly distributed throughout the strobilus.