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A Platydictya Moss - Platydictya jungermannioides


Global Rank: G5
State Rank: SNR

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General Description
Plants: Pleurocarpous (Vitt 1988), very small, growing in slender, compact mats (Lawton 1971), or frequently as solitary threads amongst other moss species (Vitt 1988), green to ochre (FNA 2014). Stems 5-15 mm in length (Lawton 1971), erratically branched, the branches growing from the stem at an acute angle and easily breaking away from it; hyalodermis lacking; pseudoparaphyllia lacking; rhizoids arising from leaf axils, and those of juveniles, at least, purple and grainy (FNA 2014).

Leaves: Remotely spaced (Lawton 1971), spreading to about 45 degrees, occasionally turned to one side, 0.1 to (rarely) 0.5 mm in length (FNA 2014), cupped (Flowers 1973), not pleated, lance-shaped, narrowing to a flat acumen; base not extending down the stem; leaf edges flat, not bordered (FNA 2014), smooth, or occasionally finely saw-toothed proximally (Lawton 1971); costa absent or short, wide and very faint (Flowers 1973).

Leaf Cells: Upper and medial laminal cells short and somewhat diamond-shaped to softly rectangular, approaching 4:1; marginal cells arranged in 1 layer; alar cells nearly square, the region inconspicuous and consisting of up to 7 cells (FNA 2014).

Range Comments
North American Range

Canada: YT to NU, BC to NL and NS (except MB and PE); USA: AK, WA, CA, ID, AZ, MT to NM, ND, IA, MI, AR, NY and VT (FNA 2014). Known in Montana from Cascade, Flathead, Lake, Meagher, Ravalli, Sanders, and Teton Counties (Elliott and Pipp 2016).


Habitat
Stone, soil and humus in moist, protected areas such as fissures of bluffs, beneath stone shelves, or in cavities below tree roots, also on the undersurfaces of rotting wood (Crum and Anderson et al. 1981). Occurring from lowlands to elevations of approximately 6560 feet (Lawton 1971).

Reproductive Characteristics
Dioicous. Perichaetial leaves frequently saw-toothed to the leaf tip (Lawton 1971) or somewhat ciliate. Seta 6-11 mm tall. Capsule upright or nearly so, the theca sometimes reaching 1 mm in length, shrunken below the opening, including the neck, when dry; stomata present in the short neck; exostome teeth yellowish; cilia of the endostome segments well- to scarcely-developed (Crum and Anderson et al. 1981).

Specialized vegetative reproduction from several-celled propagula borne in the leaf axils (FNA 2014).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Crum, H.A. and L.E. Anderson. 1981. Mosses of Eastern North America. 2 volumes. Columbia University Press, New York. 1328 pp.
    • 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.
    • Flowers, S. 1973. Mosses: Utah and the West. Brigham Young University, Provo, Utah. 567 p.
    • Lawton, E. 1971. Moss Flora of the Pacific Northwest. Hattori Botanical Laboratory. Japan: Yamabuki-cho, Shinjuku-ku, Tokyo. 362 pages plus appendices.
    • Vitt, D. J. Marsh, and R. Bovey. 1988. Mosses, Lichens & Ferns of Northwest North America. Seattle, WA: University of Washington Press. 296 p.
  • 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.
    • Smith, A.J.E. 1980. The Moss Flora of Britain and Ireland. Cambridge University Press, Cambridge. 705 pp.
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A Platydictya Moss — Platydictya jungermannioides.  Montana Field Guide.  .  Retrieved on , from