Fig. 4.

Roots of the Cottonwood Canyon lycophyte. (A–C) Roots with darkened apices that may represent root caps (arrows). Part (B) and counterpart (C) of specimen are shown to demonstrate that all three roots have darkened apices. (D–G) Roots showing various degrees and patterns of branching. Note the thin central stele clearly visible in (D), and the dense branching at the base of roots in (F), which have a tufted appearance. (F) and (G) illustrate root tufts diverging in opposite directions, in a horizontal plane, from vertical root-bearing axes (asterisks) exposed in cross-section on the bedding plane. Scale bars = 5 mm. Specimens: HPH 27 (A), KU D872a (B), KU D872b (C), KU D1616b (D), KU D1625h (E), KU D1153 (FG), KU D1814 (G).