Status: Native
Synonyms:
Euriccia nigrella (DC.) Lacout.
and others
Riccia nigrella is small even by Riccia standards, with the thallus only about 1mm long and less
than that wide. There is a shallow central groove. The scales along the bottom are so dark purple as to appear black along the margin of the thallus. When the thalli are dry, they roll up into black tubes. Many thanks to Barbara Thiers for help confirming the ID of this
specimen.
Please click on an image for a larger file.
Riccia nigrella, habit-- hundreds of minute grayish green plants (the bright green things are lichen thalli), Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, July 11, 2026
Riccia nigrella, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, habit after heavy rain, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, habit aftern heavy rain, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, dry habit, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, dry habit, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, cross section of thallus, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, cross section of thallus, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, cross section of thallus, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
Riccia nigrella, cross section of thallus, Grant County, Gila National Forest, just north of Ben Lily Monument along Hwy 15 on thin sand and Nostoc in shallow depressions in ryolite-like rock, Russ Kleinman and Karen Blisard, June 4, 2026
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