A Grammatical Dictionary of Botanical Latin

caliginosus,-a,-um (adj.A), caligosus,-a,-um (adj.A): full of mist, covered with mist, foggy, misty; dark, obscure, gloomy [> L. caligo,-inis (s.f.III), a mist, vapor; darkness].

NOTE: cf. clouded, “when colors are unequally blended together” (Lindley).

NOTE: among the examples given below, caliginosus may refer to color (dingy or murky; obscure, dark) and to habitat (misty or foggy areas). One of the synonyms of the lichen Polyporus caliginosus is ‘fuscopurpureus,’ a grayish- or blackish-brown purple, i.e. a cloudy color, often grayish-blue;

Eucalyptus caliginosa; Hieracium caliginosum; Potentilla caliginosa; Rubus caliginosus.

Menegazzia caliginosa (a lichen); Polyporus caliginosus (a fungus) = P. fuscopurpureus = Fomes caliginos[us]

Bombus caliginosus, Fog-belt Bumble Bee, a reference to its preferred habitat (i.e. Coastal Fog Belt); Dryoctenes caliginosus (an insect); Harpalus caliginosus, Murky Ground Beetle, Dingy Ground Beetle, often found near indoor and outdoor lights at night; Macrolophus caliginosus a (truebug).

Aporrectodea calliginosa (an earthworm); Helodrilus caliginosus, Common Field Worm, (an earthworm).