160
521
Leaves soft,
deciduous. Pinnae
obtuse or subacute at
apex. Basal pinnulae
similar to the others
Polystichum
braunii (Spenn.)
Fée
522
Indusium (small
membrane covering
the sori) absent
Athyrium
distentifolium
Tausch ex Opiz
522
Indusium present
523
523
Pinnae of the basal
pair very asymmetrical
(downward pointing
pinnulae much longer
than the others),
broadly triangular in
outline. Pinnulae of
the upper pinnae
profoundly lobed to
completely divided
524
523
Pinnae of the basal
pair symmetrical or
almost so, narrowly
triangular in outline.
Pinnulae of the upper
pinnae entire or
slightly lobed
525
524
Scales of leaf-stalks
black in the centre,
reddish brown at the
margin
Dryopteris dilatata
(Hoffm.) A. Gray
1...,150,151,152,153,154,155,156,157,158,159 161,162,163,164,165,166,167,168,169,170,...444