Key to Athyrium
View taxon page for Athyrium
(For a list of species in Athyrium, use the above link.)
Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.
1. Sori generally round, ± near
margin;
indusia 0, marginal
tooth 1. A small, pointed projection, such as on the margin of a leaf, sepal, or petal. 2. The free tips of otherwise fused structures, such as sepals or petals (somewhat archaic usage); smaller than lobes.
often
reflexed Abruptly bent or curved downward or backward.
over
sorus In many ferns, a distinct cluster of sporangia.
..... A. distentifolium var. americanum 1' Sori
oblong Longer than wide, with nearly parallel sides; wider than linear.
or J-shaped, ± not near margin; indusia oblong, J-shaped, or
reniform Kidney-shaped; often pertaining to a leaf in which the blade base on both sides of the petiole is rounded and concave.
, margin ± reflexed or not, but not over sorus
..... A. filix-femina var. cyclosorum
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