Macginitiea rannii

Name

Macginitiea rannii

Rank

Species

Generic Name

[Genus] Macginitiea

Authors (Pub.)

Huegele I. B. Correa Narváez J. E.  

Publication

Revisiting the iconic Macginitiea plant and its implications for biogeography, basilaminar lobe development, and evolution in Platanaceae [2024/1]

Journal

International Journal of Plant Sciences

Volume

185

Issue

2

Page number

142

Year

2024

Fossil Status

leaves

Stratigraphy

Ypresian

Strat. comment

Aycross Formation / 49.57 (10.95, 20.35) Ma

Location

Kisinger Lakes, northwest of Lander, Fremont County, Wyoming, USA [UF loc. 19375; lat. 43.70093337N, long. 109.88196677W]

Paleoregion

America (North)

Data for Holotypus

Repository

Florida Museum of Natural History, Gainesville, USA

Repository Number

UF 19375-59682

Num

fig. 2A, 2C

Pub.

Revisiting the iconic Macginitiea plant and its implications for biogeography, basilaminar lobe development, and evolution in Platanaceae [2024/1]

Data for Paratypus

Repository

Florida Museum of Natural History, Gainesville, USA

Repository Number

UF 19375-59637 (fig. 2B), 59685 (fig. 2E), 59688 (fig. 3F, 3H), 59691 (fig. 2D), 59692 (fig. 2G); 19376-60010 (fig. 2F); 19377-59566 (fig. 3E), 59574 (fig. 3A)

Num

2 B, D, E, G, F; 3 A, E

Pub.

Revisiting the iconic Macginitiea plant and its implications for biogeography, basilaminar lobe development, and evolution in Platanaceae [2024/1]

Diagnosis

Leaf simple, petiolate. Lamina palmately lobed (3–5 lobes). Lobes elongate elliptical, sometimes lanceolate, apex acuminate. Central lobe length equals or exceeds one-half of the total length (sinus depth ca. 45%–65% of lamina). Base cuneate or rounded, sometimes peltate, rarely truncate. Peltate bases rounded and serrate or sometimes with basilaminar lobes. Basilaminar lobes paired and deeply dissected or grouped in three and apron-like. Margin serrate, sometimes with teeth limited to the lobe tips. Sinuses rounded. Teeth regularly spaced, sometimes compound, sinuses rounded, distal flank concave, proximal flank convex, straight, or concave. Tooth tips often bulbous. Venation craspedodromous. Primary veins palinactinodromous. Secondary veins pinnate, curved, rarely straight, closely spaced (ca. 7–13 pairs of secondaries per lobe). Agrophic veins present. Tertiary veins opposite percurrent. Quaternary veins opposite percurrent connecting with higher-order venation to form a fine reticulate mesh. Freely ending veinlets present, usually branched, rarely unbranched.