Pseudotorellia zhoui

Name

Pseudotorellia zhoui

Rank

Species

Generic Name

[Genus] Pseudotorellia

Authors (Pub.)

Dong C. Shi G.-L. Zhang X.-Q. Wang Z.-X. Wang Y.-D.  

Publication

Middle-Late Jurassic fossils from Northeast China confirm the affiliation of Umaltolepis seed-bearing structure and Pseudotorellia leaves [2022/8]

Journal

Review of Palaeobotany and Palynology

Volume

306

Issue

104763

Page number

6

Year

2022

Fossil Status

foliage

Stratigraphy

Oxfordian

Strat. comment

Haifanggou Formation

Location

Daohugou village (41°19′25″ N, 119°14′40″ E), Ningcheng County, Inner Mongolia Autonomous Region, Northeast P.R. China

Paleoregion

Eurasia (China)

Data for Holotypus

Repository

Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China

Repository Number

PB23884

Num

Plate IV, 1

Pub.

Middle-Late Jurassic fossils from Northeast China confirm the affiliation of Umaltolepis seed-bearing structure and Pseudotorellia leaves [2022/8]

Diagnosis

Penultimate shoot woody, covered with a thick layer of persistent bud scales, near terminal end bearing spirally arranged ultimate short shoots. Ultimate short shoots with alternating pseudowhorls of persistent bud scales and abscission scars left by leaves or stalks of reproductive organs. Leaves borne on apex of ultimate short shoots in a cluster of 6 to 10. Leaf blade sessile, strap-shaped to narrowly oblanceolate. Leaves with slightly acute apex, cuneate base, and entire margins. Veins dichotomously branched, each leaf blade with 4 to 8 longitudinal parallel veins that extending to the leaf apex. Leaf cuticle thick, hypostomatic. Adaxial cuticle with distinct narrow costal zones alternating with wide intercostal zones; abaxial cuticle with distinct non-stomatal bands alternating with stomatal bands. Epidermal cells on both cuticle arranged in longitudinal files, more or less elongated, rectangular in outline, with straight anticlinal walls, and often with oblique end walls, each bearing a median longitudinal cuticular ridge on the periclinal walls in external view. Epidermal cells over costal zones of adaxial cuticle usually strongly elongated. Stomata longitudinally oriented to leaf margin, sparse, commonly arranged in 1–3 short, discontinuous stomatal files forming stomatal band. Each stoma with 2 guard cells, surrounded by 2–4 specialized lateral subsidiary cells and 2 unspecialized polar cells. Ledges of guard cells sunken, with well-developed, butterfly-shaped cuticular flanges. Lateral subsidiary cells strongly cuticularized, forming two lateral bow-shaped cuticular ridges flanking elliptical stomatal pit.