Difference between revisions of "Timmia norvegica var. excurrens"
Bryoph. Itin. Pol. Norv., 121. 1906,.
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Revision as of 22:31, 27 May 2020
Plants generally smaller and more delicate than those of var. norvegica. 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; costa excurrent, smooth on abaxial surface of sheath, smooth or slightly papillose on abaxial surface of the limb, with one–several teeth at back near the apex; base of costa pale and not strongly attached to the stem; stem tips often with loose deciduous clusters of almost linear leaves (ca. 3 × 0.1–0.2 mm).
Habitat: Calcareous areas, often on shaded limestone cliffs near rivers in Arctic and boreal regions, intermixed with other mosses, including other taxa of Timmia
Elevation: low to moderate elevations (0-1500 m)
Distribution
Greenland, Nfld. and Labr. (Nfld.), N.W.T., Nunavut, N.S., Que., Yukon, Alaska, Eurasia (Scandinavia, Switzerland, Poland, Russia), Atlantic Islands (Iceland).
Discussion
Variety excurrens is known also as a Quaternary subfossil from New York and Vermont. Variety excurrens is not known to occur with sporophytes, but the deciduous leaves no doubt act as vegetative propagules.
Selected References
None.