Diodonopteris gracilis

Name

Diodonopteris gracilis

Rank

Species

Generic Name

[Genus] Diodonopteris

Authors (Pub.)

Ma J. Wang S.-J. He X.-Z. He X.-Y. Ma S.-M.  

Publication

Diodonopteris, a new genus of the Paleozoic leptosporangiate fern family Botryopteridaceae, from the lower Permian of Shanxi Province, North China [2016/8]

Journal

Review of Palaeobotany and Palynology

Volume

234

Page number

13

Year

2016

Fossil Status

foliage (fertile)

Stratigraphy

Asselian

Strat. comment

Taiyuan Formation

Location

Xishan Coalfield, Shanxi Province, P.R. China

Paleoregion

Cathaysia (North)

Data for Holotypus

Repository

National Museum of Plant History of China, Institute of Botany, Beijing, China

Repository Number

Coal ball 72001: Stem 1 (S1)

Num

Fig. 3; Plate I; Plate II, 6, 7; Plate III, 4-6, 9; Plate IV, 4

Pub.

Diodonopteris, a new genus of the Paleozoic leptosporangiate fern family Botryopteridaceae, from the lower Permian of Shanxi Province, North China [2016/8]

Data for Paratypus

Repository

National Museum of Plant History of China, Institute of Botany, Beijing, China

Repository Number

Coal ball 72001: Stem 2 (S2)

Num

Plate II, 1, 2; Plate III, 1-3, 7-8; Plate IV, 5

Pub.

Diodonopteris, a new genus of the Paleozoic leptosporangiate fern family Botryopteridaceae, from the lower Permian of Shanxi Province, North China [2016/8]

Diagnosis

Stem slender with the diameter usually less than 2 mm and with isotonic dichotomous branching. Haplostele with tracheid diameter decreasing outward. A single protoxylem strand located at c. 1/3 diameter of the stele and associated with petiolar trace formation. A plate of parenchymatous cells present between the incipient petiolar trace and the cauline stele. Uniseriate scalariform thickenings present on cauline tracheid walls. Inner cortex consisting of tangentially elongated and contiguously arranged parenchymatous cells; middle cortex of larger, isodiametric and more or less loosely arranged parenchymatous cells; outer cortex of sclerenchymatous cells. Xylem of petiolar trace and petiole usually with one protoxylem group adaxially. Petioles round with the diameter up to 1 mm. Metaxylem tracheids of petiolar traces and petioles conspicuously smaller than those of the stem. Adventitious roots diverging from the periphery of cauline stele or abaxial side of the incipient petiolar trace and sparse. Rachis D-shaped, up to 500 μm in maximum width. Xylem of rachis slightly to conspicuously adaxially curved with 1 protoxylem group at each lateral margin.