Actinostachys

Wallich

Numer. List. 1. 1829.

Common names: Ray spiked fern
Etymology: Greek aktis, ray, and stachys, spike, referring to the rays of the fertile leaves
Treatment appears in FNA Volume 2.
Revision as of 15:50, 18 September 2019 by FNA>Volume Importer

Plants terrestrial. Roots dark, fibrous, covered with dark, stiff hairs, 2–3 mm. Stems upright; hairs uniseriate. Leaves all fertile (even youngest), unbranched, long-petioled. Blades falsely digitate, reduced to 2–many erect to spreading terminal rays; rays appearing to be whorled but actually borne on very short rachis. Sporangia in 2–4 rows. Gametophytes subterranean, not green, tuberlike, brown-hairy. x = 134, 140.

Distribution

Nearly worldwide in tropical regions.

Discussion

Species 20 (1 in the flora).