Lemna (Spirodela) scutata Dawson

Plant Fossil Names Registry Number: PFN001909

Act LSID: urn:lsid:plantfossilnames.org:act:1909

Rank: species

Reference: Dawson, J. W. (1875): Notes on the plants, collected by Mr. G. M. Dawson, from the Lignite Tertiary Deposits, near the Forty-ninth Parallel. in Dawson, G. M. (ed.): Report on the geology and resources of the region in the vicinity of the Forty-ninth Parallel, from the Lake of the Woods to the Rocky Mountains. Dawsons Brothers, Montreal: pp. 327–331.

Page of description: 329

Illustrations or figures: pl. 16, figs 5, 6

Name is type for

Limnobiophyllum Krassilov 1973

Other combinations

Spirodela scutata (Dawson) E.W.Berry 1935

Limnobiophyllum scutatum (Dawson) Krassilov 1973

Types

Syntype
Figures: pl. 16, figs 5, 6

Note: At least two figured speimens were included in his new species by Dawson (1875: Rept. Geol. Res. 49th Parallel, p. 329).

Bell (1949: Bull. Geol. Surv. Canada, 13: pl. 63, fig. 1) figured one specimen (no. 5456b, Geological Survey, Canada) determined as Dawson's syntype.

Lectotype 5456b, Geological Survey of Canada, Canada
designated in Kvaček, Z. (1995): Limnobiophyllum Krassilov – a fossil link between the Araceae and the Lemnaceae. – Aquatic Bot. 50: 49–61. on page 51
Plant Fossil Names Registry Number: PFN001952
Act LSID: urn:lsid:plantfossilnames.org:act:1952
Previously published illustration or figures: pl. 63, fig. 1 in Bell, W. A. (1949): Uppermost Cretaceous and Paleocene floras of western Alberta. – Bull. Geol. Surv. Canada 13: 1–231.

Original diagnosis/description

Fronds round kidney-form, entire or slightly undulate at the edges, sometimes an inch in diameter, single or grouped. Roots numerous, filiform, proceeding from a round spot near the notch of the frond.

Stratigraphy

Paleogene, Paleocene
Ravenscrag Formation

Berry (1935: Mem. Geol. Surv. Canada, 182: 23) stated that "...and I suspect came from the Paskapoo formation". But Bell (1949: Bull. Geol. Surv. Canada, 13: 82) specified the stratum typicum for the specimen, which was later designated as lectotype, as "Ravenscrag formation".

Locality

Canada
Badlands south of Wood Mountain, Saskatchewan

Berry (1935: Mem. Geol. Surv. Canada, 182: 23) stated that "This species was described from the "Badlands south of Woody Mountain, Alberta,'' and...". But Bell (1949: Bull. Geol. Surv. Canada, 13: 82) specified for the specimen, which was later designated as lectotype, locality as "Saskatchewan, locality 4095".

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

Comments

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