Jowingera triloba

Name

Jowingera triloba

Rank

Species

Generic Name

[Genus] Jowingera

Authors (Pub.)

Bickner M. A. Tomescu A. M. F.  

Publication

Structurally complex, yet anatomically plesiomorphic: permineralized plants from the Emsian of Gaspé (Quebec, Canada) expand the diversity of Early Devonian euphyllophytes [2019/1]

Journal

IAWA Journal

Annee/Jahrgang

2019

Volume

20(3)

Issue

10.1163/22941932-40190234

Page number

[12]

Year

2019

Fossil Status

stems (wood)

Stratigraphy

Emsian

Strat. comment

Battery Point Formation

Location

vicinity of Douglastown, south shore of Gaspé Bay, Quebec, Canada

Paleoregion

Laurussia (Laurentia)

Data for Holotypus

Repository

National Museum of Natural History, Smithsonian Institution, Washington, USA

Repository Number

Axis in slabs USNM 557790-3 A (slides Atop series b)

Num

Figure 13–15

Pub.

Structurally complex, yet anatomically plesiomorphic: permineralized plants from the Emsian of Gaspé (Quebec, Canada) expand the diversity of Early Devonian euphyllophytes [2019/1]

Diagnosis

Small axes (c. 1 mm diameter) ± circular in cross section. Primary xylem a three-ribbed actinostele, with ribs extending 300 μm or more from the stele center. Xylem ribs exhibiting a direct correlation of length and width. Conspicuous mesarch protoxylem strands present at stele center and close to rib tips. Metaxylem tracheids up to 50 μm wide, with rounded outline and Psilophyton-type secondary wall thickenings; tracheids elongated radially or in a direction perpendicular to xylem ribs, tracheid size decreases toward periphery of xylem. Phloem forming thin layers in the embayments between xylem ribs and along sides of xylem ribs. Cortex a mixture of parenchyma and sclerenchyma; areas of larger-celled parenchyma present outside of the phloem, between the xylem ribs.