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A Pseudoleskea Moss - Pseudoleskea radicosa
Other Names:  Lescuraea radicosa

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:

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General Description
Plants: Growing in dense mats, green, sometimes with yellow or orange tints. Stems with coarse, catkin-like branches (FNA 2014), up to 10 cm, their tips usually curved; rhizoids several to numerous (Lawton 1971), growing in bunches from leaf stem bases; possessing a central strand and numerous branched, threadlike or foliose paraphyllia (FNA 2014).

Leaves: Flattened to the stem when dry, erect-spreading when wet, shiny or not, ovate to lance-shaped, 0.6-2.4 mm in length (FNA 2014), 0.25-1 mm in width, sickle-shaped (Lawton 1971), sometimes turned in the same direction (second); apex narrowing suddenly to become acuminate, the acumen long or short but lacking a hairpoint (FNA 2014), frequently toothed; margins smooth (Lawton 1971), turned under slightly in the bottom half or to nearly as far as the acumen; costa reaching the apex or nearly so, occasionally wavy, lime-green. Leaves of stems and branches similar (FNA 2014).

Leaf Cells: Alar cells nearly square to becoming more elongate crosswise; medial laminal cells varying from 4-angled with short sides to elliptic or spindle-shaped, mostly 2-3:1 (or up to 4:1), the walls unpitted and usually thin (FNA 2014).

Capsules ripen in summer (FNA 2014).

Diagnostic Characteristics
P. radicosa has laminal cells that are longer, broader and more thinly walled than the closely-related P. incurvata (FNA 2014).

Range Comments
Greenland; North America: AK, YT, BC and AB, s to CA, AZ, and NM. Also QC, NL, MI and NH; Eurasia; Iceland (FNA 2014). Known in Montana from Carbon, Cascade, Flathead, Gallatin, Glacier, Lake, Lincoln, Madison, Missoula, Park, Ravalli, and Sweet Grass Counties (Elliott 2016).

Reproductive Characteristics
Dioicous. Capsules 1-2 mm in length, upright to nearly so (FNA 2014), brown or reddish-brown (Lawton 1971).

No specialized vegetative reproduction (FNA 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • Elliott, J.C. and A.K. Pipp. 2018. A Checklist of Montana Mosses (1880-2018). Updated 3 January, 2020. Montana Natural Heritage Program, Helena, Montana. 73 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
    Do you know of a citation we're missing?
    • 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.
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Citation for data on this website:
A Pseudoleskea Moss — Pseudoleskea radicosa.  Montana Field Guide.  .  Retrieved on , from