Adiantum hispidulum |
Adiantum viridimontanum |
|
---|---|---|
rosy maidenhair, rough maidenhair |
Green Mountain maidenhair, Green Mountain maidenhair fern |
|
Stems | short-creeping; scales dark reddish brown, concolored, margins entire. |
short-creeping; scales bronzy deep yellow, concolored, margins entire. |
Leaves | arching, clustered, 20–37 cm. |
arching to stiffly erect, often densely clustered, 38–75(–90) cm. |
Petiole | 1–2 mm diam., adaxially hispid, not glaucous. |
1–3 mm diam., glabrous, often glaucous. |
Blade | lanceolate, pinnate or occasionally pseudopedate, 1-pinnate distally, 12–18 × 6.5–8 cm; proximal pinnae 1–4-pinnate; indument of light-colored, sparse, multicellular hairs; rachis straight, densely hispid, not glaucous. |
fan-shaped to funnel-shaped, pseudopedate, 1-pinnate distally, 10–35 × 10–35(–45) cm, glabrous; proximal pinnae 2–7-pinnate; rachis straight, glabrous, often glaucous. |
Ultimate segments | oblong to long-triangular, ca. 2 times as long as broad, progressively reduced toward apex of penultimate divisions; basiscopic margin oblique; acroscopic margin of fertile segments crenulate, sterile segments sharply denticulate; apex obtuse or acute. |
long-triangular, ca. 2.5 times as long as broad; basiscopic margin oblique; acroscopic margin lobed, lobes separated by narrow (less than 1 mm) incisions; apex acute, usually entire. |
False indusia | ± round, 0.6–0.9 mm diam., covered with reddish brown, stiff, needlelike bristles. |
transversely oblong, mostly 2–5(–10) mm, glabrous. |
Spores | mostly 40–60 µm diam. |
mostly 45–58 µm diam. 2n = 116. |
Segment | stalks 0.2–0.3 mm, dark color generally entering into segment base. |
stalks (0.4–)0.6–1.5(–1.9) mm, dark color commonly entering into segment base. |
Adiantum hispidulum |
Adiantum viridimontanum |
|
Phenology | Sporulating summer–fall. | Sporulating summer–fall. |
Habitat | Banks and old walls | Restricted to serpentine sites where it occurs in rock clefts, on talus slopes, and in well-developed serpentine soils |
Elevation | 0–100 m [0–300 ft] | 200–800 m [700–2600 ft] |
Distribution |
CT; GA; Asia in s India; e Africa; Pacific Islands [Introduced in North America] |
VT |
Discussion | Adiantum hispidulum is represented by sporadic escapes from cultivation in the flora, possibly naturalized locally. It also has been reported from Florida and Louisiana. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Adiantum viridimontanum, an allopolyploid from a sterile hybrid between A. pedatum and A. aleuticum, is known only from north central Vermont (C. A. Paris and M. D. Windham 1988). Additional populations may eventually be located on serpentine in southern Quebec. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Swartz: J. Bot. (Schrader) 1800(2): 82. (1801) | Paris: Rhodora 93: 108. (1991) |
Web links |