Peltigera gowardii - Peltigera gowardii
State Rank Reason (see State Rank above)
Known from a few sites in western Montana.
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Peltigera gowardii (Peltigera gowardii) Conservation Status Review
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Thallus foliose, gelatinous (non-stratified), medium sized, dark bluish gray to dark gray or black, loosely appressed in ruffles; lobes to about 1 cm wide; lower surface dark, distinctly veined; apothecia common, the disk brownish, spores 3-septate; and the photobiont blue-green (McCune and Geiser 2009)
. Chemistry: All spot tests negative (McCune and Geiser 2009)
The only gelatinous lichen with distinct veins. It is also the largest strictly aquatic lichen in the Pacific Northwest. Look for the dark, ruffled masses in small spring-fed streams. While searching for P. hydrothyria you will encounter ear-like lobes of non-lichenized Nostoc attached to submerged rocks; these are more jelly-like than P. hydrothyria and are never veined (McCune and Geiser 2009)
Known from each of the major mountain chains in the U.S. and southern Canada, but more common in the Cascade and Sierra Nevada Ranges than in the other ranges (McCune and Geiser 2009).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Aquatic, in mountain streams and springs, especially those without marked seasonal fluctuations. Grows on rock and gravel, rarely on wood.
Aquatic. An indicator of good water quality. Photobiont is cyanobacteria (Nostoc), a nitrogen-fixer.
Reproduces sexually by spores from the apothecium.
Threats or Limiting Factors