Difference between revisions of "Timmia norvegica"
Öfvers. Kongl. Vetensk.-Akad. Förh. 19: 364. 1862,.
FNA>Volume Importer |
imported>Volume Importer |
||
| (6 intermediate revisions by 2 users not shown) | |||
| Line 20: | Line 20: | ||
|distribution=North America;Eurasia;Atlantic Islands (Iceland);Pacific Islands (New Zealand). | |distribution=North America;Eurasia;Atlantic Islands (Iceland);Pacific Islands (New Zealand). | ||
|discussion=<p>Varieties 2 (2 in the flora).</p><!-- | |discussion=<p>Varieties 2 (2 in the flora).</p><!-- | ||
| − | --><p>Timmia norvegica is related to T. sibirica, with which it shares the important character of fragile leaf bases; however, the papillosity of the limb in T. sibirica is a strongly differentiating character. Timmia norvegica differs from T. austriaca and T. megapolitana by having fragile leaf bases, heterophyllous leaves, and less well delimited leaf sheaths.</p> | + | --><p><i>Timmia norvegica</i> is related to <i>T. sibirica</i>, with which it shares the important character of fragile leaf bases; however, the papillosity of the limb in <i>T. sibirica</i> is a strongly differentiating character. <i>Timmia norvegica</i> differs from <i>T. austriaca</i> and <i>T. megapolitana</i> by having fragile leaf bases, heterophyllous leaves, and less well delimited leaf sheaths.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
| Line 43: | Line 43: | ||
-->{{#Taxon: | -->{{#Taxon: | ||
name=Timmia norvegica | name=Timmia norvegica | ||
| − | |||
|authority=J. E. Zetterstedt | |authority=J. E. Zetterstedt | ||
|rank=species | |rank=species | ||
| Line 55: | Line 54: | ||
|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V27/V27_213.xml |
|genus=Timmia | |genus=Timmia | ||
|species=Timmia norvegica | |species=Timmia norvegica | ||
Latest revision as of 21:24, 5 November 2020
Plants with deciduous, longer distal leaves with a less well-developed sheath. Leaf apex acute or acuminate; costae ending a few cells below apex or excurrent; sheath clear in the distal leaves, orange-brown to reddish black in the proximal leaves; limb green, pellucid; limb-sheath transition gradual; limb margins coarsely dentate in distal 1/3–1/2, slightly toothed, crenulate or ± entire proximally; limb lamina cells 6–16(–18) × 6–14 µm, with tall rounded mamillae on the adaxial surface, abaxial surface smooth; sheath lamina cells with (0–)1–6(–8) large round, verrucose papillae over abaxial surface of the lumen; cells at leaf insertion abruptly differentiated into 1 to a few rows of fragile, hyaline cells; limb costa papillose on abaxial surface, or toothed near the apex, adaxial cells with tall bottle-shaped mamillae. Sexual condition dioicous; perichaetial leaves longer and more evenly tapering than stem leaves, sheath poorly developed. Calyptra unknown. Capsule non-plicate; exothecial cells with extremely sinuose walls; stomata on neck and proximal urn; endostome cilia with numerous short blunt appendiculations on the interior surfaces.
Distribution
North America, Eurasia, Atlantic Islands (Iceland), Pacific Islands (New Zealand).
Discussion
Varieties 2 (2 in the flora).
Timmia norvegica is related to T. sibirica, with which it shares the important character of fragile leaf bases; however, the papillosity of the limb in T. sibirica is a strongly differentiating character. Timmia norvegica differs from T. austriaca and T. megapolitana by having fragile leaf bases, heterophyllous leaves, and less well delimited leaf sheaths.
Selected References
None.
Key
| 1 | Leaves 3-8(-12) mm, 0.8-1.1 mm wide at mid-limb; cells of mid-limb lamina (8-)9-16(-18) × (8-)9-14 µm; base of costa dark; never with loose clusters of linear leaves at stem tips | Timmia norvegica var. norvegica |
| 1 | Leaves 2-6 mm, 0.5-0.6 mm wide at mid-limb; cells of mid-limb lamina 6-10(-11) × 6-9(-10) µm; base of costa pale; stem tips often with loose deciduous clusters of almost linear leaves | Timmia norvegica var. excurrens |