Cyathocarpus benefoliatii

Name

Cyathocarpus benefoliatii

Rank

Species

Generic Name

[Genus] Cyathocarpus

Authors (Name)

Guo Y. Zhou Y. Feng Z.  

Authors (Pub.)

Guo Y. Zhou Y. Pšenička J. Bek J. Feng Z.  

Publication

A marattialean fern with in situ spores, Cyathocarpus benefoliatii sp. nov., from the Lopingian of Southwest China [2024/10]

Journal

Review of Palaeobotany and Palynology

Volume

331

Issue

105218

Page number

4

Year

2024

Fossil Status

foliage (fertile)

Stratigraphy

Lopingian

Strat. comment

Xuanwei Formation

Location

104◦23′20″ E, 25◦50′31″ N, Fuyuan County, Qujing City, Yunnan Province, China

Paleoregion

Cathaysia (South)

Data for Holotypus

Repository

Institute of Palaeontology, Yunnan University, Kunming, China

Repository Number

YNUPB10184

Num

2 A

Pub.

A marattialean fern with in situ spores, Cyathocarpus benefoliatii sp. nov., from the Lopingian of Southwest China [2024/10]

Diagnosis

Fronds at least tripinnate. Antepenultimate and penultimate rachises straight and thick. Penultimate pinnae alternately attached to antepenultimate rachises at acute angles. Ultimate pinnae alternately or suboppositely attached to penultimate rachises at perpendicular or subperpendicular angles and linear in outline. Up to 18 pairs of pinnules alternately attached to ultimate rachises at perpen dicular or subperpendicular angles and closely spaced. Fertile pinnules linguiform with rounded apexes, entire bases, and parallel entire gins. Fertile pinnules small (4–6 mm long, 2–3 mm wide). Midvein straight and distinct, extending from base to apex. Synangia abaxially arranged in a row on each side of midvein. Each row having 4–7 angia from base to apex of pinnule, closely spaced. Synangia ovoidal, 650–1200 μm in diameter, radially symmetrical, bearing 4 or 5 sporangia. Sporangia exannulate, ovoidal, 400–600 μm in diameter, laterally fused along most or all of their length. Inner-facing sporangial wall having one layer of cells, outer-facing sporangial wall having three layers of cells. Monolete laevigate spores, circular to oval amb.