Extended Data Fig. 2: A. mackiei rooting axes grew in the direction of the gravity vector.
From: Stepwise and independent origins of roots among land plants
a–c, Positively gravitropic growth of two apices (a) was inferred from their orientation relative to sediment layers in both the growth substrate (dark brown and black bands at base of b) and a geopetally infilled void (c) preserved in the thin section. The position of both the apices and geopetally infilled void are highlighted with black boxes within the thin section (b). a–c, NHMUK V.15642. Scale bars, 1 mm (a, c), 1 cm (b).
