Rhizome 1.5-3 mm thick, long-creeping, phyllopods (1.5-)3-5 cm apart, buds about halfway along the internodes. Anatomy: vascular strands c. 10, sclerenchyma sheath distinct, sclerenchyma strands c. 15, mainly peripheral. Rhizome scales spreading to squarrose, peltate, 7-8 by 0.6-0.9 mm, entire, hyaline. Fronds dimorphic, stalked. Fertile fronds with stalks 1-6 cm long, to 0.15-0.25 as long as the lamina, lamina 17-37 by 0.8-2.2 cm, base narrowed, widest in the basal part, apex contracted to a narrow fertile spike. Sterile fronds with stalks to 9 cm, to 0.5 as long as the lamina, lamina 13.5-42 by 14.4 cm, index 10-20, base narrowed, widest below the middle, apex acute. Venation: veins distinct, veinlets frequently forked, sometimes more copiously branched, frequently anastomosing, free veins many, mainly excurrent. Hydathodes absent. Stellate hairs dimorphic, forming a dense mat, dirty whitish, the straight rays acicular, often brown, usually forming a sparse upper layer. Coenosorus on an apical spike, occasionally interrupted below, medial between costa and lamina, 2-4 mm wide, developing acropetally. Sporangia long-stalked, paraphyses inconspicuous, with short, straight rays. Spores with longitudinal ridges.
Home