Dicksonia glauca Sm.; Cibotium st.-johnii Krajina; C. st.-jolmii var.fal/ax Krajina; C. st.-jolmii var.fal/ax subvar. crenatum Krajina; C. st.-johnii var. fa/lax subvar. integrilobatwn Krajina; C. st.-jo/mii var. st.-johnii subvar. auritwn Krajina [Hillebrand's C. cha-missoi Kaulf. ~ var.]
Endemic hapu 'u, hapu 'u pulu
Latin glaucus, bluish green or gray, in ref-erence to the color of the abaxial surfaces of the ultimate segments.
Caudices 1-2(-6) m tall, 16-18+ cm diam., commonly with buds. Fronds to 7 m long. Stipes ranging from glabrous except at base to very hairy with entire stipe covered with concolorous, golden, tan, mustard, dusty gray, or occasionally (in very hairy forms) reddish brown hairs, to multicolor streaked. Pinnae sinuses narrow-angled, cut 7/8 or more to costa. Ultimate segments narrow, 4-5 mm wide, sharp-pointed auricles present on basiscopic basal segments, sometimes over-lying rachises, abaxial surfaces light blue gray, glaucous, glabrous to covered with white arachnoid hairs.
Abundant in mesic to wet forests, 300-1,700 m, occasionally as low as 100m, all major islands. This Cibotium is usually found at higher elevations than the other Hawaiian species and is the most common Cibotium above 800 m.
Cibotium glaucum is very variable in the degree of hairiness of both the stipe and ab-axial surfaces of the segments, varying from very hairy to almost glabrous .
Cibotium glaucum may be recognized in the field by the light blue gray undersur-faces of the ultimate segments usually clothed with white, cobwebby (arachnoid) hairs; narrow ultimate segments with narrow, deeply cut sinuses between them; and a pointed ear (auricle) on each lowermost basal segment.