Parent:
HYMENOPHYLLUM L.
F.
Subgenus MERINGIUM (Presl) Cop. in Philipp. J. Sci. 64, 1937, 14.
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Fronds pinnately compound, margins toothed or rarely entire, cell-walls us. thick and pitted; indusium funnel-form, 2-valved in upper part; receptacle us. far-exserted.
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1
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Fronds seldom over 2.5 cm. long, pinnatifid to simple; indusial valves spinulose on margins and backs
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3. minimum
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Fronds mostly 10-30 cm. long, pinnately compound; indusial valves not spinulose
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2
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2
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Sori near bases of pinnae free; indusium 2-valved to about middle, about 3 mm. long
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1. multifidum
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Sori not restricted to bases of pinnae, partly immersed; indusium 2-valved almost to base, 1-1·5 cm. long
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2. bivalve
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