Trisquamales

Name

Trisquamales

Rank

Order

Authors (Pub.)

Gordenko N. V. Broushkin A. B.  

Publication

Semennye organy Trisquamales ordo. nov. (Gymnospermae) iz sredney yury Kurskoy oblasti, Evropeyskaya chast' Rossii [2018]

Journal

Paleontologicheskii Zhurnal

Annee/Jahrgang

2018

Issue

1

Page number

87

Year

2018

Parent Taxon

[Phylum] Pinophyta

Type

[Genus] Trisquama

Diagnosis

Ovuliferous organs consist of one sterile and one fertile (seed-bearing) structures. Sterile structure, comprising stalk of ovuliferous organ and undissected distal part, vascularized by C-shaped in section collateral vascular bundle, and bears fertile structure on its anatomically abaxial side. Fertile structure lobed, vascularized by concentric amphicribral vascular bundle, which departs from phloem side of sterile structure vascular bundle. Concentric bundle in its distal part divided into separate collateral segments, associated with lobes of fertile structure. Cavity with seeds closes through joining of distal part of sterile structure and lobes of fertile structure. Seeds orthotropous, with not protruding somewhat shifted micropyle, vascularized from xylem side of fertile structure vascular bundle segments. Integument single, sclerified, without sarcotesta; nucellus free from integument more than one half, megaspore membrane thick.