familyHymenophyllaceae
genusHymenophyllum
Show Lower Taxa
Difference between revisions of "Hymenophyllum"
5: 418. 1793.
Common names: Filmy fern
Etymology: Greek hymen, membrane, and phyllon, leaf
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>epiphytic or on rock. <b>Stems</b> long-creeping, intertwining, threadlike; hairs brown, sparse. <b>Roots</b> few, delicate. <b>Leaves</b> 1–3-pinnatifid, 2–6 × 0.5–1.5 cm. <b>Petiole</b> short, threadlike, not winged. <b>Blade</b> with inconspicuous glandular hairs or prominent stellate hairs; margins entire to distantly dentate. <b>Soral</b> involucres 2-valved, the halves roundish to ovate. <b>Sporangial</b> receptacle a low mound of tissue included within involucre. <b>Gametophytes</b> persistent, ribbonlike, much branched. <b>Gametophyte</b> gemmae platelike or absent.</span><!-- |
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Latest revision as of 20:22, 5 November 2020
Plants epiphytic or on rock. Stems long-creeping, intertwining, threadlike; hairs brown, sparse. Roots few, delicate. Leaves 1–3-pinnatifid, 2–6 × 0.5–1.5 cm. Petiole short, threadlike, not winged. Blade with inconspicuous glandular hairs or prominent stellate hairs; margins entire to distantly dentate. Soral involucres 2-valved, the halves roundish to ovate. Sporangial receptacle a low mound of tissue included within involucre. Gametophytes persistent, ribbonlike, much branched. Gametophyte gemmae platelike or absent.
Distribution
Worldwide in tropical regions.
Discussion
Most species of Hymenophllyum occur in middle elevation rainforests; a few occur in continuously moist temperate habitats. Although all members of this genus are relatively small and delicate, leaves of many species outside the flora become considerably longer by indeterminate growth of the leaf apices.
Species ca. 310 (3 in the flora).
Selected References
Key
| 1 | Leaf blades glabrous. | > 2 |
| 1 | On wet rock or epiphytic on bark and decaying wood of large conifers; coastal British Columbia, Alaska. | Hymenophyllum wrightii |
| 2 | Blade segments and involucres dentate. | Hymenophyllum tunbrigense |
| 2 | Blade segments and involucres entire. | Hymenophyllum wrightii |