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Necker's Thamnobryum Moss - Thamnobryum neckeroides
Other Names:  A Tree Moss

Potential Species of Concern

Global Rank: G4
State Rank: SH

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:

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General Description
Plants: Green to chartreuse, glossy to dull, (4-)6-8(-10.5) cm (FNA 2014), the main stem creeping, developing a stipe-like upright or inclined secondary stem that branches above in a somewhat dendroid fashion. Branches 1-5 cm in length, often slender and whip-like (Lawton 1971).

Leaves: Secondary stem leaves upright to erect-spreading, cupped, egg-shaped, 2-3.2 mm in length, 1-1.7 mm in width (FNA 2014). Branch leaves overlapping, their apices curving upward and inward when dry, smaller near the branch ends (Lawton 1971), egg-shaped or nearly boat-shaped, conspicuously concave, 1-2.2 mm in length, 0.5-0.8 mm in width; apex widely acute to broader, rounded; margins at the apex serrate (FNA 2014), flat; costa solitary, stout at the base, narrowing toward and not reaching the apex, toothed on the adaxial side (Lawton 1971).

Leaf Cells: Basal and upper medial cells 4-sided, sometimes very narrow; medial cells next to costa long and diamond-shaped, the longest axis running the same direction as the costa; apical cells nearly square to short and diamond-shaped (FNA 2014).

Diagnostic Characteristics
Dioicous. Fruit seldom produced. Seta reddish-brown (FNA 2014), 1 cm in length, upright or bowed. Capsule brown, upright or occasionally slanting from the bowed seta; theca ca 2 mm in length, contracted under the mouth when dessicated (Lawton 1971).

Range Comments
Canada: BC; USA: AK, CA, CT, ID, MT, NY, NC, OH, OR, PA, WA; Europe; Asia (FNA 2014). In Montana: Flathead, Lake, Lincoln, and Sanders Counties (Elliott & Pipp, 2016).

Habitat
Shady banks, bluffs, boulders, tree bases (FNA 2014), soil, rock and humus in calcareous habitats (Elliott & Pipp, 2016) in areas influenced by a Pacific maritime climate. Occurs from lowlands to 6560 feet.

Reproductive Characteristics
Dioicous. Fruit seldom produced. Seta reddish-brown (FNA 2014), 1 cm in length, upright or bowed. Capsule brown, upright or occasionally slanting from the bowed seta; theca ca 2 mm in length, contracted under the mouth when dessicated (Lawton 1971).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Elliott, J. and A. Pipp. 2016 (forthcoming). Checklist of Montana Mosses. Revised 2016. Prepared by the Montana Natural Heritage Program, Helena, Montana. 90 pp.
    • Flora of North America Editorial Committee, eds. 2014. Flora of North America North of Mexico. Volume 28. Bryophytes: Mosses, Part 2. Oxford University Press, Inc., NY. xxi + 702 pp.
    • Lawton, E. 1971. Moss Flora of the Pacific Northwest. Hattori Botanical Laboratory. Japan: Yamabuki-cho, Shinjuku-ku, Tokyo. 362 pages plus appendices.
  • Additional ReferencesLegend:   View Online Publication
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    • Lawton, E. 1971. Keys for the Identification of the Mosses on the Pacific Northwest. Reprinted from 'Moss Flora of the Pacific Northwest'. Published as Supplement No. 2 of the Journal of the Hattori Botanical Laboratory. Nichinan, Miyazaki, Japan. 66 pp.
    • Malcolm, B., N. Malcolm, J. Shevock, and D. Norris. 2009. California Mosses. Nelson, New Zealand: Micro-Optics Press. 430 pp.
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Citation for data on this website:
Necker's Thamnobryum Moss — Thamnobryum neckeroides.  Montana Field Guide.  .  Retrieved on , from