Woodsia obtusa
Blunt-lobed woodsia
Image of Woodsia obtusa

Photo by Kitty Kohout 

Key Characteristics

Medium-sized fern (40-60 cm) of calcareous dry cliffs; blade lanceolate with twice-divided toothed leaves; petioles light brown; spores borne in amoeba-like clusters on underside of pinnae.

Status and Rank

  • State Status: T
  • State Rank: S1S2
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Chippewa11953
Dickinson21983
Emmet11923
Huron11911
Keweenaw11899
Marquette11918
Distribution map for Woodsia obtusa

Updated 1/31/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

This fern is found on dry, shady cliffs and in crevices.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Associated Plants

Rusty woodsia, common polypody, fragile fern, and sugar maple.

Management

This species benefits from maintenance of natural habitat and disturbance processes. Where necessary, it should be protected from excessive foot traffic and other impacts due to recreation.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Apr 24, 2017]

References

Survey References

Technical References

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