February is one of my favorite months. Some may dislike “dreary February” but I am biased; it’s my birthday month. As a special treat, I participated in an afternoon “Swamp Seminar” to learn how to identify northeastern wetland ferns. The webinar is part of an online training series offered by Swamp School. After the training, I earned a certificate. Since I’ve written about ferns a few times for this blog, I thought I better brush up on fern morphology, before I made a fern faux pas. And as it happens, I was wrong about one plant: sweet fern (Comptonia peregrina) is a member of the heath family, not a true fern.
The “Swamp Seminar” on wetland ferns started with the parts of a fern. Prior to this class, I knew to refer to the frond, which is the whole fern leaf, and I understood that rhizomes are the roots, but the rest of a fern’s morphology was new information. It was fascinating to learn that a fern might be identified based on whether it is once, twice or thrice pinnate–meaning, the number of cuts on the pinna, or leaflet. Lady Fern, a common fern that grows throughout the northeast, is three-times pinnate with a rough-edged leaflet, making it look lacy. Several ferns have similarly feminine names like Venus Hair Fern (Adiantum capillus‐veneris) and Northern Maiden-Hair Fern (Adiantum pedatum), or Maiden-Hair Spleenwort (Asplenium trichomanes), which grows near waterfalls and is said to be “good for the spleen.”
For wetland professionals, the training addressed whether each fern is an Obligate Wetland species, meaning that it always occurs in a wetland, also known as a hydrophyte (loves water); a Facultative Wetland species, which means that the fern usually shows up in a wetland, but can also be found in upland areas; or, thirdly, it may be a Facultative species, commonly occurring in both wetland and upland areas. Ferns that fit this last category–facultative, are still important to know because they may help someone identify the edge of a wetland.
Identifying wetland plants is fairly complex. See this USDA page on wetland indicator information, for a more specific explanation. Last fall, the National Wetland Plant List was updated and published by the Army Corps of Engineers. ASWM offered a training session on how to use the NWP List website (see this recorded presentation). Several publications are also available that aid in using this plant list, including A Field Guide to the National Wetland Plant List: Wetland Ratings for Plants of the United States by Steve Chadde, 2012.
Among the many types of ferns covered in the Swamp Seminar, participants learned how to identify Sensitive fern (Onoclea sensibilis), Fragile fern (Cystopteris fragilis) and Interrupted fern (Osmunda claytoniana), which has a distinctive shape. The Swamp School webinar included access to an online tool kit, which allows participants to reference handouts. The website and webinar training are well-organized and condensed to relay a great deal of knowledge. It’s suitable for intermediate and advanced levels—and ideal for wetlandkeepers. Swamp School also offers classes on wetland delineation–in both classroom, field and webinar formats with live, interactive training. For more information, visit SwampSchool.org.
Update: Hydric Soil Indicators Webinar March 20, 2013. For more information, visitSwampSchool.org