Plant Fossil Names Registry Number: PFN001950
Act LSID: urn:lsid:plantfossilnames.org:act:1950
Authors: V. A. Krassilov
Reference: Krassilov, V. A. (1973): Cuticular structure of Cretaceous angiosperms from the Far East of the USSR. – Palaeontographica, Abt. B 142(4–6): 105–116., link
Page of description: 110
Lemna (Spirodela) scutata Dawson
Leaf reniforme about 12 mm wide, leaf surface tuberous. Leaf blade epistomatic, stomata rare, guard cells and lateral subsidiary cells thinly cutinized, sunken in a pit formed by polar subsidiary cells and encircling cells. Trichomes scattered, simple, short, conical. Druses frequent on the lower epidermis.
Kvaček, Z. (1995: Aquatic Bot., 50: 51):
Free-floating aquatic stoloniferous herb, main stem strongly reduced, bearing one to two leaves and numerous simple fine as well as few thicker, simply branched roots. Stolons mostly serially connecting individual plants, simple, persistent. Leaves sessile, entire-margined, suborbicular to reniform, subcordate at base, usually 1–2 cm across at maturity, punctate on the surface, aerenchymous. Venation campylodromous, 9–14 primaries, occasionally steeply forked, arising from the leaf base, median vein of the same thickness as the other primaries, with one or two irregular interprimaries and longitudinal elongated meshes of higher-order venation.