Arceuthobium viscoides (Göpp. et Berendt) Sadowski, Seyf., C.A.Wilson, Calvin et A.R.Schmidt

Plant Fossil Names Registry Number: PFN000609

Act LSID: urn:lsid:plantfossilnames.org:act:609

Authors: E. M. Sadowski, L. J. Seyfullah, C. A. Wilson, C. L. Calvin & A. R. Schmidt

Rank: species

Basionym: Enantioblastos viscoides Göpp. et Berendt

Reference: Sadowski, E. -M., Seyfullah, L. J., Wilson, C. A., Calvin, C. L. & Schmidt, A. R. (2017): Diverse early dwarf mistletoes ( Arceuthobium ), ecological keystones of the Eocene Baltic amber biota. – American Journal of Botany 104(5): 694–718.

Page of description: 702

Types

Holotype MB.Pb.1981-2, Museum für Naturkunde, Berlin, Germany
Figures: pl. VI, figs 6, 7

Note: Holotype refigured by Conwentz (1886: Die Angiospermen des Bernsteins, pl. XII, figs 20–22) and by Sadowski et al. (2017: Am. J. Bot.,104(5): fig. 5).

Sadowski et al. (2017: Am. J. Bot.,104(5): 705) listed a paratype "Hoffeins Amber Collection, GZG.BST.21950 (Hoffeins 1422-2), Geoscientific Collections of the University of Göttingen, Germany ( Figs. 6–9 )". But it is not clear on which basis, because Göppert et Berendt (1845) mentioned only one specimen.

Original diagnosis/description

Ein 2½ Lin. langer Zweig in natürlicher Grösse in nicht ganz klarem Bernstein; Fig. 7 vergrössert. Man erkennt hier die schwache Streifung des kleinen Stengelchens, so wie zwei durch kurze, stark rundlich ausgeschnittene Deckblättchen gestützte, sitzende, einander gegenüber gestellte Knöspchen und oberhalb derselben zwei sparrig auseinanderstehende, ziemlich dicke, verkehrt lanzett-, oder eigentlich fast spateiförmige, innerhalb etwas vertiefte Blättchen. Das ganze Pflänzchen erinnert auffallend an Viscum, zu welcher Gattung, aber freilich zu einer von der unsrigen völlig verschiedenen Art, es vielleicht zu rechnen ist.

Emended diagnosis

emConwentz (1886: Die Angiospermen des Bernsteins, p. 127):
Ramulo minuto foliis lanceolatis subacutis integerrimis carinatis excavatis crassiusculis basi connatis decussatis stipulis lanceolatosubulatis acutis integris intrapetiolaribus instructis, gemmis axillaribus tribus bractearum paribus decussatis, bracteis late ovatis acutis integris glabris.

Sadowski et al. (2017: Am. J. Bot., 104(5): 705):
Shoots verticillately branched, internodes 1.2–5.2 mm long × 0.2–0.4 mm wide. Expanded leaves oblanceolate, margins entire, decussate, 1.2–2.3 mm long × 0.2–0.4 mm wide, leaving a convex abscission scar; axillary buds, decussate, two-paired, with four decussate scale pairs, one scale pair comparatively minute at the bud side. Squamate bracts: only at nodes of fruiting infl orescence, two-paired, decussate, rhombic, entire margins, subtending a whorl of pedicellate fruits. Mature fruits elliptic, 0.6–0.7 mm long × 0.3 mm wide, divided, distal part deeply furrowed, proximal part finely ribbed.

Stratigraphy

Paleogene, Eocene
Blue Earth layer, late Eocene (according to Sadowski et al. (2017: Am. J. Bot., 104(5): 705)

Locality

Russian Federation
Samland, Kaliningrad (according to Sadowski et al. (2017: Am. J. Bot., 104(5): 705)

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

Notes

Comments

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