Asplenium ruta-muraria
Image of Asplenium ruta-muraria

Photo by Bradford S. Slaughter 

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Key Characteristics

Small fern (5-15 cm) of calcareous cliffs and crevices; fronds dissected, each pinnae with toothed pinnules; lower rachis entirely green; sori on backs of fronds elongated.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G5


County NameNumber of OccurrencesYear Last Observed
Distribution map for Asplenium ruta-muraria

Updated 5/15/2018. 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.


This species grows on cliffs, boulders, and talus of dolomite, limestone, and calcareous shales.

Natural Community Types


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

Polypody, purple cliff brake, fragile fern, poison ivy, and northern honeysuckle.


The species would benefit from monitoring known sites and habitat preservation, particularly from trampling due to intensive recreation such as rock climbing. Additional surveys for new sites are also warranted.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator. A systematic search with transects as a guide provides the greatest coverage possible of habitat. Greatest coverage occurs with parallel transects spaced equidistant over the area. Search rock faces and crevices; fern is small and obscure.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at [Accessed Aug 18, 2018]


Survey References

Technical References

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