Cooksonia caledonica D.Edwards

Plant Fossil Names Registry Number: PFN000858

Act LSID: urn:lsid:plantfossilnames.org:act:858

Author: D. Edwards

Rank: species

Genus:

Reference: Edwards, D. (1970): Fertile Rhyniophytina from the Lower Devonian of Britain. – Palaeontology 13(3): 84–87., link

Page of description: 457

Illustrations or figures: pl. 87, figs 1–10

Name is type for

Other combinations

Types

Original diagnosis/description

Incomplete plant at least 6·7 cm. high. Naked dichotomously branching axes 0·4–1·8 mm. wide {average 0·65 mm.). Term inal spherical to oval sporangia, some also reniform. Border (0·1–0·2 mm. wide) sometimes present. Globose sporangia 1·2–2·0 mm. high (average 1·7 mm.) by 1·3–2·2 mm. wide (average 1·8 mm.). Oval ones 1·1– 1·8 mm. high (average 1·6 mm.) by 1·8–3·0 mm. wide (average 2·4 mm.). Axis widens slightly below sporangium.

Emended diagnosis

Gonez et Gerrienne (2010: Rev. Palaeobot. Palynol., 163: 71):
axes 0.4–1.8 mm wide (x̄ = 0.65 mm), branches length decreasing distally. Distalmost axis segment 1.4–4.4 mm long (x̄ = 3 mm) and 0.4–0.9 mm wide (x̄ = 0.62 mm). Circular sporangia 1.2–2 mm high (x̄ = 1.7 mm) and 1.3–2.2 mm wide (x̄ = 1.8 mm). Oval and reniform sporangia 1.1–1.8 mm high (x̄ = 1.6 mm) and 1.8–3 mm wide (x̄ = 2.4 mm). Sporangial border 0.14–0.35 mm wide.

Stratigraphy

Devonian, Lower Devonian
Cairnconnan Group, Dittonian Stage Lower Old Red Sandstone of Scotland

Locality

United Kingdom
Aberlemno Quarry, Aberlemno, approximately 1½ miles north-north-west of Turin Hill, Angus; Nat. Grid Ref. 527551