Alnus sp. I

Smith, MacKenzie A., Greenwalt, Dale E. & Manchester, Steven R., 2023, Diverse Fruits And Seeds Of The Mid-Eocene Kishenehn Formation, Northwestern Montana, Usa, And Their Implications For Biogeography, Fossil Imprint 79 (1), pp. 37-88 : 57

Alnus sp. I 1

Text-fig. 8d

M a t e r i a l. USNM PAL 622756.

L o c a l i t y. Disbrow Creek.

D e s c r i p t i o n. Infructescence cylindrical, 14.7 mm long, 7.1 mm wide; borne on a twig 1.2–3.8 mm wide.

R e m a r k s. Although the attachment is not completely preserved, it appears that the peduncle on this specimen was short. Due to the thick, coalified bracts, this specimen likely belongs to Alnus rather than Betula , which has thinner, deciduous bracts.

Figures

Text-fig. 8. Betulaceae and Juglandaceae from the Kishenehn Formation. a: DMNH L6933 Alnus sp. L1 leaves. Scale bar 2cm. b: DMNH EPI.48179 Alnus sp. leaf. Scale bar 2cm. c: DMNH EPI.48136b Alnus sp. leaf. Scale bar 2cm. d: USNM PAL 622756 Alnus sp. I1 infructescence attached to branch. Scale bar 1cm. e: USNM PAL 623160 Betuloideae showing wing, seed body and two persistent styles. Scale bar 1mm. f: USNM PAL 622732 Alnus sp. F1 samara showing two persistent styles. Scale bar 1mm. g: USNM PAL 624925 Betula sp. samara showing wing, seed body and two persistent styles. Scale bar 1mm. h: USNM PAL 623147 Alnus sp. F2 samara showing. Scale bar 1mm. i: USNM PAL 622690 Palaeocarya sp. samara showing three wings with reticulate venation and hairs at base. Scale bar 1cm.