Difference between revisions of "Athyrium distentifolium var. americanum"
Naturaliste Canad. 93: 272. 1966..
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|common_names=American alpine lady fern;athyrie alpestre sous-espèce américaine | |common_names=American alpine lady fern;athyrie alpestre sous-espèce américaine | ||
| − | |basionyms= | + | |basionyms=|basionyms={{Treatment/ID/Basionym |
| − | | | ||
|name=Athyrium alpestre var. americanum | |name=Athyrium alpestre var. americanum | ||
|authority=Butters | |authority=Butters | ||
|rank=variety | |rank=variety | ||
| − | + | |publication_title=Rhodora | |
| − | | | + | |publication_place=19: 204. 1917 |
| − | | | + | }} |
| − | | | + | |synonyms={{Treatment/ID/Synonym |
| − | + | |name=Athyrium alpestre subsp. americanum | |
| − | |name=Athyrium | ||
|authority=(Butters) Lellinger | |authority=(Butters) Lellinger | ||
|rank=subspecies | |rank=subspecies | ||
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|authority=Fernald | |authority=Fernald | ||
|rank=variety | |rank=variety | ||
| + | }} {{Treatment/ID/Synonym | ||
| + | |name=Athyrium americanum | ||
| + | |authority=(Butters) Maxon | ||
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Athyrium distentifolium subsp. americanum | |name=Athyrium distentifolium subsp. americanum | ||
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|rank=variety | |rank=variety | ||
|parent rank=species | |parent rank=species | ||
| − | |synonyms=Athyrium | + | |synonyms=Athyrium alpestri subsp. americanum;Athyrium alpestre var. gaspense;Athyrium americanum;Athyrium distentifolium subsp. americanum |
| − | |basionyms= | + | |basionyms=Athyrium alpestre var. americanum |
|family=Dryopteridaceae | |family=Dryopteridaceae | ||
|habitat=Wet talus slopes, rocky hillsides, alpine meadows | |habitat=Wet talus slopes, rocky hillsides, alpine meadows | ||
Latest revision as of 19:23, 1 March 2024
Stems ascending or short-creeping. Petiole straw-colored or red-brown distally, (7–)10–30 cm, base dark red-brown to black with 2 rows of teeth, swollen; scales at base brown to dark brown, lanceolate or broadly lanceolate, 13 × 3(–5) mm. Blade narrowly elliptic or lanceolate, 2–3-pinnate-pinnatifid, 15–55(–65) × 3–25 cm, moderately narrowed proximally, broadest below middle, apex acuminate. Pinnae short-stalked, narrowly deltate to deltate-oblong, apex acute. Pinnules deeply pinnatifid, segments oblong, crenulate. Rachis, costae, and costules with small, pale brown scales. Veins pinnate. Sori round to elliptic; indusia absent or very minute, scalelike. 2n = 80.
Habitat: Wet talus slopes, rocky hillsides, alpine meadows
Elevation: 600–3100 m
Distribution
Greenland, Alta., B.C., Nfld. and Labr. (Nfld.), Que., Yukon, Alaska, Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.
Discussion
Athyrium distentifolium var. americanum differs from var. distentifolium of Europe in its more finely dissected leaves with crenulate pinnule-segments, relatively broader pinnae with abruptly larger basal pinnules, and much more rudimentary indusia, if any. Japanese plants are more similar to var. americanum than to var. distentifolium, and they need further study.
Selected References
None.