Difference between revisions of "Isoëtes orcuttii"
Fern Bull. 8: 13. 1900.
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|elevation=mostly 0–1500 m | |elevation=mostly 0–1500 m | ||
|distribution=Calif.;Mexico in Baja California. | |distribution=Calif.;Mexico in Baja California. | ||
| − | |discussion=<p>Isoëtes orcuttii, a vernal pool endemic, may be difficult to distinguish from I. nuttallii, which occurs in a wider range of habitats. Plants of I. orcuttii are generally smaller than those of I. nuttallii, which has longer, thicker, less flexible leaves and larger megaspores.</p> | + | |discussion=<p><i>Isoëtes orcuttii</i>, a vernal pool endemic, may be difficult to distinguish from <i>I. nuttallii</i>, which occurs in a wider range of habitats. Plants of <i>I. orcuttii</i> are generally smaller than those of <i>I. nuttallii</i>, which has longer, thicker, less flexible leaves and larger megaspores.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1900 | |publication year=1900 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V2/V2_430.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes orcuttii | |species=Isoëtes orcuttii | ||
Revision as of 15:48, 18 September 2019
Plants becoming terrestrial. Rootstock nearly globose 2(–3)-lobed. Leaves deciduous, bright green, pale toward base, less than 8 cm, gradually tapering to tip, often surrounded at base by several black scales to ca. 5 mm, spirally arranged, pliant, gradually tapering to tip. Velum covering entire sporangium. Sporangium wall unpigmented. Megaspores white to gray, lustrous, 200–380 μm diam., ± smooth to obscurely tuberculate; girdle obscure. Microspores brown in mass, 20–30 μm, smooth to papillose. 2n = 22.
Phenology: Spores mature in spring.
Habitat: Vernal pools
Elevation: mostly 0–1500 m
Distribution
Calif., Mexico in Baja California.
Discussion
Isoëtes orcuttii, a vernal pool endemic, may be difficult to distinguish from I. nuttallii, which occurs in a wider range of habitats. Plants of I. orcuttii are generally smaller than those of I. nuttallii, which has longer, thicker, less flexible leaves and larger megaspores.
Selected References
None.