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Alligatorweed (Alternanthera philoxeroides)

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Alligatorweed

(Alternanthera philoxeroides)

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Pennsylvania

iMapInvasives

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    Found an invasive species? Register for a free login account, or submit a public report.
    Return to Gallery of Invaders

    Algae

    Black Mat Alga
    Black Mat Alga

    Lyngbya wollei (Plectonema wollei) Photo credit: Amanda Foss, https://www.researchgate.net/figure/249962358_fig3_Fig-3-Micrographs-of-Lyngbya-wollei-scale-bars-are-50-mm-A-exhibiting-false

    1/1
    Black Mat Alga
    (Lyngbya wollei [Plectonema wollei])
    Codium
    Codium

    Codium fragile ssp. tomentosoides Photo credit: Luis A. Solorzano, californiabiota.com

    1/1
    Codium
    (Codium fragile ssp. tomentosoides)
    Didymo
    Didymo

    Didymosphenia geminata Photo credit: Sarah Spaulding, U.S. Geological Survey

    1/1
    Didymo
    (Didymosphenia geminata)
    Golden Alga
    Golden Alga

    Prymnesium parvum Photo credit: Texas Parks and Wildlife

    1/1
    Golden Alga
    (Prymnesium parvum)
    Red Alga
    Red Alga

    Gracilaria vermiculophylla Photo credit: © Ignacio Bárbara (barbara@udc.es).

    1/1
    Red Alga
    (Gracilaria vermiculophylla)
    Starry Stonewort
    Starry Stonewort

    Nitellopsis obtusa Photo credit: Kristian Peters-Fabelfroh 12:41, October 2006-Wikimedia Commons

    1/1
    Starry Stonewort
    (Nitellopsis obtusa)
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    The Pennsylvania iMapInvasives Program is a partnership of the Western Pennsylvania Conservancy, the Pennsylvania Natural Heritage Program, and NatureServe.

    Funding for Pennsylvania iMapInvasives is provided by the Great Lakes Restoration Initiative.

    thumbnail_NatureServe new logo_H color (3).png
    Pennsylvania Natural Heritage Program, iMapInvasives partner
    Great Lakes Restoration Initiative logo, iMapInvasives funding source