Skip to main content

Table 1 Morphological comparison between fossil species of Mesocyparis

From: Fossil evidence reveals how plants responded to cooling during the Cretaceous-Paleogene transition

Taxa M. sinica M. borealis M. umbonata M. beringiana M. rosanovii
Seed Cone
 Length (mm) 4.4–5.2 3.0–5.0 2.8–5.0 2.0–4.0 3.5–5.0
 Width (mm) 4.0–5.1 3.0–5.0 1.9–4.0 2.0–4.0 3.0–4.0
 Arrangement opposite opposite decussate* decussate* most decussate, a few opposite*
Cone Scale
 shape obovate to ovate obovate peltate* ovate peltate*
 Length (mm) 3.7–4.3 3.0–5.0 2.3–4.0 no data no data
 Width (mm) 2.8–3.1 3.0 1.8–3.9 no data no data
 number 4 4 4 4 4
 size of the two pairs approximately equal in size approximately equal in size upper pair larger than lower* upper pair larger than lower* approximately equal in size
 position of umbo on cone scale near the apex near the apex in center* near the apex near the apex
 Shape of umbo’ s tip acuminate acute* acute* acute* acute*
 Shape of umbo erect reflexed* erect erect erect
Branch
 Arrangement opposite, forming flat frond-like sprays opposite, forming flat frond-like sprays more than 1/4 alternate, others opposite* opposite, forming flat frond-like sprays most opposite, a few alternate*
Leaf
 Facia and lateral leaves of fertile shoots dimorphic dimorphic monomorphic* dimorphic monomorphic*
Shootlet
 Length of facial leaves (mm) 1.1–2.1 2.0–3.0 0.8–2.0 0.5–0.6 1.5
 Width of facial leaves (mm) 0.8–1.6 1.2–2.0 0.6–1.2 no data 1.0
 Length of lateral leaves (mm) 0.9–2.4 2.0–3.0 0.5–2.0 no data no data
 Width of lateral leaves (mm) 0.4–0.8 0.5–1.0 0.1–0.4 no data no data
 facial leaves overlap Present Present Present Absent* Present
 lateral leaves overlap Present Present Present Absent* Present
Shoot
 Length of facial leaves (mm) 1.8–3.8 3.5–6.0 1.4–4.0 2.0–3.0 1.5–3.0
 Width of facial leaves (mm) 0.4–0.6 0.5–1.0 0.5–0.9 1.5–2.0 0.8–2.0
 Length of lateral leaves (mm) 1.7–2.7 3.5–5.0 1.5–3.8 no data 1.5–3.0
 Width of lateral leaves (mm) 0.4–0.5 0.5–1.0 0.2–0.6 no data 0.4–0.8
 facial leaves overlapping Present no data Absent* no data Absent*
 facial leaves appressed Present Present Present no data Present
 lateral leaves overlap Absent Absent Absent no data Absent
 apices of lateral leaves free Present Present Present no data Present
 Location Heilongjiang, China Saskatchewan, Canada Alberta, Canada Koryak, Russia Amur Region, Russia
 Age Early Paleocene Paleocene Masstrichtian Masstrichtian Early Paleocene
 Reference this paper [18] [22] [19, 20, 22] [21]
  1. “*” indicating character differences between Mesocyparis sinica and other four Mesocyparis species