Woodsia alpina
Northern woodsia

Key Characteristics

Small fern (20 cm) of calcareous dry cliffs; blade lanceolate with lobed, untoothed pinnae; rachis with scattered hairs and scales; spores borne in amoeba-like clusters surrounded by hair-like protrusions on underside of pinnae.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G4G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Keweenaw31994
Marquette21983
Distribution map for Woodsia alpina

Updated 7/21/2017. 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

Northern woodsia occurs on rock cliffs, crevices, talus, and rocky, boreal woods in sun to partial shade. It is usually found in alkaline rock formations, but occasionally occurs on igneous outcrops.

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.

Associated Plants

Fragile fern, common polypody, harebell, Oregon woodsia, wild columbine, rusty woodsia, and smooth cliff-brake.

Management

This species primarily requires maintenance of intact habitat and protection from trampling.

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 Nov 17, 2017]

References

Survey References

Technical References

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