Flora of the Hawaiian Islands
Pteridophyte
   Thelypteridaceae
      Cyclosorus
General Information
DistributionA genus of ca. 185 species mostly in the Old World, the great majority in Malesia.
Habit
Terrestrial or rarely epiphytic; rhizome erect, or prostrate and short-or rarely long-creeping; scales narrow, with both marginal and superficial acicular hairs.
Leaves
Fronds 1-pinnate; pinnae ± deeply lobed, with 2–12 basal pairs abruptly, or in a few species progressively much-reduced; aerophores at bases of pinnae often swollen on living fronds; lower blade surface between veins not pustular when dried, usually bearing acicular hairs, upper surface glabrous or rarely with antrorse acicular hairs, brownish orange or yellow often opaque sessile spherical glands usually present on the lower surface (lacking on C. invisus), at least 1 pair of basal veins anastomosing, or rarely meeting at, or just beyond, the sinus membrane.
Sori
Sori round, or rarely elongate or intermediate in shape, indusiate or rarely exindusiate; indusium bearing sessile glands like those of the lamina and/or acicular or gland-tipped hairs; sporangia commonly bearing a (sub)sessile spherical gland or rarely short setae near the annulus and a gland-tipped hair on the stalk.
Spores
Spores mostly pale brown, echinate or winged.
Chromosomes
n = 36
Notes
Following Smith et al. (2006) we include Amphineuron, Chingia, Christella, Plesiorneuron, and Sphaerostephanos under Cyclosorus.
Contributor
David Lorence, co-author K. R. Wood