Part 14

Small, fronds undivided, heart-shaped at the base or sometimes with prolonged basal ears, tapering above to a prolonged point which roots, forming a new plant, fruit-dots oblong or linear, irregularly scattered. On shaded rocks, preferring limestone. P. 146.

35. HART'S TONGUE

Scolopendrium vulgare

Fronds a few inches to nearly two feet long, undivided, oblong-lanceolate, heart-shaped at base, fruit-dots linear, elongated. Growing among the fragments of limestone cliffs. Very rare. P. 150.

36. VIRGINIA CHAIN FERN

Woodwardia Virginica

Large, fronds once-pinnate, pinnæ pinnatifid, fruit-dots oblong, in chain-like rows parallel and near to the midrib, confluent when ripe. In swamps. P. 156.

GROUP VI

FERTILE AND STERILE FRONDS LEAF-LIKE AND USUALLY SIMILAR, FRUIT-DOTS ROUND

37. NEW YORK FERN

Aspidium Noveboracense

Usually rather tall, fronds once-pinnate, with deeply pinnatifid pinnæ, tapering both ways from the middle, margins of fertile fronds not revolute. In woods and open meadows. P. 159.

38. MARSH FERN

Aspidium Thelypteris

Usually rather tall, fronds once-pinnate, with pinnæ deeply pinnatifid, scarcely narrower at the base than at the middle, veins forked, fertile fronds noticeable from their strongly revolute margins. In wet woods and open swamps. P. 160.

39. MASSACHUSETTS FERN

Aspidium simulatum

Close to preceding species, rather tall, fronds once-pinnate, with pinnatifid pinnæ little or not at all narrowed at base, veins not forked, margin of fertile frond slightly revolute. In wooded swamps. P. 164.

CHRISTMAS FERN

Aspidium acrostichoides

40. SPINULOSE WOOD FERN

Aspidium spinulosum var. intermedium

Very common, usually but not always large, fronds oblong-ovate, 2-3 pinnate, lowest pinnæ unequally triangular-ovate, lobes of pinnæ thorny-toothed. In woods everywhere. P. 166.

41. BOOTT'S SHIELD FERN

Aspidium Boottii

From one and a half to more than three feet high. Sterile fronds smaller and simpler than the fertile, nearly or quite twice-pinnate, the lowest pinnæ triangular-ovate, upper longer and narrower, pinnules oblong-ovate, sharply thorny-toothed. In moist woods. P. 168.

42. CRESTED SHIELD FERN

Aspidium cristatum