Niebla juncosa is a fruticose lichen that grows on rock, stony soil and sand along the Pacific Coast of Baja California from Punta Banda to Morro Santo Dominogo.

[1] The epithet, juncosa is in reference to the thallus divided into rush-like branches, the stems of the flowering plant genus Juncus.

[1] The cortex surrounds a fistulose to subfistulose medulla, varying from 55–175 μm thick, generally thinner on the branches where a change in thickness appears related fragmentation branchlets that break off from primary branches.

Variety juncosa common on rocks but occasionally on sand under Yucca valida in the southern part the Baja peninsula, and on stony ground in the terricolous Niebla communities in the transition zone from chaparral to desert scrub on mesas above Punta Baja.

Various outcroppings of rock piles along the ridge were discovered to have a rich assemblage of Niebla species, represented by various morphological and chemotypes.