Guide to Liverworts of Oregon: Riccia nigrella DC.
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Riccia 1b terrestrial > Riccia 2b marginal projections lacking > Riccia 5b surface smooth > Riccia 7b upper surface groove shallow > Riccia 8a ventral scales black > Riccia nigrella
Synonym: None.
Special Status: None.
Recognition: Small even for a Riccia, the black ventral scales are diagnostic. When the plants dry out, the sides curl up so that black undersides are brought together and they look like little black lines in the soil.
Distribution: Grows on bare mineral soil moist all winter, somewhat weedy; SW Oregon to California.
Comments: Likely to be found occasionally as more people look for ephemeral mosses and liverworts.
Riccia nigrella Frye & Clark 1937, p. 22.
Riccia nigrella, Ferris Gulch, Jackson Co., Oregon. DHW 9134.
Riccia nigrella. N Fk Salmon River, Siskiyou Co., California. Shevock 57996 (CAS).
Riccia nigrella. Distal view. Canyon Ranch Road, Butte Co., California. Doyle 9914 (UC).
Riccia nigrella. Proximal view. Canyon Ranch Road, Butte Co., California. Doyle 9914 (UC).
Riccia nigrella. Side view. Canyon Ranch Road, Butte Co., California. Doyle 9914 (UC).