Part 16

Phegopteris Dryopteris

Medium-sized, fronds thin and delicate, broadly triangular, spreading, ternate, the three divisions stalked, each division pinnate, pinnæ pinnatifid. In moist woods. P. 190.

52. BULBLET BLADDER FERN

Cystopteris bulbifera

Fronds delicate, elongated, tapering above from a broad base, 2-3 pinnate or pinnatifid, bearing fleshy bulblets beneath. On wet rocks, preferring limestone. P. 194.

53. COMMON BLADDER FERN

Cystopteris fragilis

Medium-sized, fronds thin, oblong-lanceolate, 2-3 pinnate or pinnatifid. On rocks and in moist woods. P. 198.

54. RUSTY WOODSIA

Woodsia Ilvensis

Small, more or less covered with rusty hairs, fronds lanceolate, once-pinnate, pinnæ pinnatifid. On exposed rocks. P. 200.

55. BLUNT-LOBED WOODSIA

Woodsia obtusa

Small, slightly downy, fronds broadly lanceolate, nearly twice-pinnate. On rocks. P. 202.

56. NORTHERN WOODSIA

Woodsia hyperborea

Very small, smooth or nearly so, fronds narrowly oblong-lanceolate, once-pinnate, pinnæ cordate-ovate or triangular-ovate, 5-7 lobed. On moist rocks. P. 203.

57. SMOOTH WOODSIA

Woodsia glabella

Very small, smooth throughout and delicate, fronds linear, once-pinnate, pinnæ roundish ovate, lobed. On moist rocks. P. 206.

FERN DESCRIPTIONS

"Nature made a fern for pure leaves."--Thoreau

GROUP I

STERILE AND FERTILE FRONDS TOTALLY UNLIKE; FERTILE FRONDS NOT LEAF-LIKE IN APPEARANCE

1. SENSITIVE FERN

Onoclea sensibilis

Newfoundland to Florida, in wet meadows.

Sterile fronds.--One or two inches to three feet high, broadly triangular, deeply cut into somewhat oblong, wavy-toothed divisions, the lower ones almost reaching the midrib, the upper ones less deeply cut; stalk long.