Marchantiolites porosus Lundbl.

Plant Fossil Names Registry Number: PFN001887

Act LSID: urn:lsid:plantfossilnames.org:act:1887

Author: A. B. Lundblad

Rank: species

Genus: Marchantiolites Lundbl.

Reference: Lundblad, B. (1954): Contributions to the geological history of the Hepaticae. Fossil Marchantiales from the Rhaetic-Liassic coal-mines of Skromberga (Prov. of Scania), Sweeden. – Svensk Botanisk Tidskrift 48(2): 381–417, pls I–IV.

Page of description: 393

Illustrations or figures: fig. 3, pI. Ill, figs 9–11, pI. IV, 1–7

Name is type for

Types

Original diagnosis/description

Fragment with preserved cellular structure representing the distalmost portion of a segment of a thalloid Hepatic. Apex obtuse, margin of segment ± uneven, width of segment about 2 mm or more (maximum length of the preserved fragment 2.6 mm). Pl. IV: 1.
The thallus consists of at least two cell layers; the one best observed has polygonal, ± isodiametric cells with a diameter of about 30–50 μ. At the margin there are 1–2 rows of smaller cells (about 20–30 μ in diameter). Fig. 3 B.
The epidermis is provided with air-pores apparently numbering about 19 per mm2 in the distalmost portion of the lobe. They are elevated, and each pore is surrounded by a concentric ring of 5–7 cells. These are of moderate size (about 10–30 μ in diameter) and of ± polygonal shape; the openings and radial walls are rather strongly cutinized. The diameter of the opening of the air-pore averages 24 μ (12–40 μ; ten observations). PI. IV: 1; Fig. 3 A–C.

Stratigraphy

Jurassic, Lower Jurassic
Liassic

Locality

Sweden
Skromberga, roof of upper coal bed