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Volume I (1961) - Flora of New Zealand Indigenous Tracheophyta - Psilopsida, Lycopsida, Filicopsida, Gymnospermae, Dicotyledons
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Athyrium Roth

ATHYRIUM Roth, 1799

Sori dorsal; indusium us. elongate and curved across veinlet at distal end of sorus, or interrupted at distal end and produced on both sides of veinlet. Sporangia with slender stalks; annulus incomplete, vertical; spores bilateral. Rhizome dictyostelic, us. erect, sts creeping. Stipes with 2 vascular strands us. uniting above. Fronds us. large and decompound, veins rarely anastomosing. In a wide sense a genus of some 600 widely distributed spp., by some split into a number of genera.

Key

1
Rhizome short, ascending; fronds 2-3-pinnate; indusia single
1. australe
Rhizome creeping; fronds pinnate; at least lower indusia double
2. japonicum
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