| Species |
Rhizome Form |
Blade Indument |
Sori Position |
Sporangia |
Dimensionality |
Distribution |
|---|
| fauriei |
creeping, to 4 mm, dark brown |
glabrous above, long, white hairs on the rachis and costa below |
half way between midrib and margin or somewhat closer to the midrib, absent from the last quarter of the pinna |
yellow to brown at maturity; paraphyses absent |
when desiccated it rolls up lengthwise |
Japan, Korea |
| virginianum |
long-creeping, producing rows of fronds, occasionally branching, whitish pruinose, slender, to 6 mm diam., at the surface |
rachis glabrous above, sparsely scaly below; scales lanceolate-ovate |
midway between margin and midrib to nearly marginal, at vein ends; on all but the lowest pinnae of fertile fronds |
yellow to brown at maturity; paraphyses (branching structures among the sporangia) present |
lowest pinnae bending down, forward; frond rolling up to the rachis (above the plane) when desiccated |
north-central Canada south to Arkansas, east to North Carolina, north to Newfoundland; also perhaps Japan, Korea, Mongolia, eastern Siberia |
| vulgare |
creeping, branching, whitish waxy, rather thick, with phylopodia |
rachis glabrous above, sparsely scaly below; scales lanceolate-ovate |
midway between margin and midrib, on the upper half of the blade |
early green, later yellow, then rusty brown; paraphyses absent |
lowest pinnae pair only slightly bending forward, down; pinnae rolling up into the rachis (above the plane) when desiccated |
central and northern Europe, less common southern Europe, eastern Asia |
Characters listed were chosen for their value in distinguishing between species.
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