Second smallest butterfly in the world and second smallest in North America, smaller only to Western Pygmy Blue. Brown below with narrow white stripes with four bold marginal spots on the hindwing. Above mostly brown. The wingspan is about 3/4" to 7/8" or 2 to 2.2 cm in length.
Trentepohlia is a genus of filamentous chlorophyte green algae but Trentepohlia species have a strong orange colour caused by the presence of large quantities of carotenoid pigments which mask the green of the chlorophyll. There are a number of similar species and we treat them as a species aggregate due to difficulty of identification.
These striking fungi vary in colour from pale orange through to a very deep orange-red inside the cup, while the outer surface is paler and covered in a very fine whitish down. The cups are initially round but soon develop wavy margins and have a tendency to split. They are shiny on the inside surface and downy on the outside. The cup is typically 1 to 4 cm tall and is attached to the soil by mycelial threads and without a visible stipe. The pale outer surface of the cup is infertile and the spores are produced on the shiny inner surface of the cup.
Colour can be extremely variable, even within individual populations. Most commonly it is grey or orange, but extreme morphs of black and almost white are rarely recorded. The foot fringe is virtually always bright orange and is strongly lineolated. The sole is paler than the body sides, often with a distinctive orange tinge, particularly towards the head. Lines extending from the fringe can commonly be observed on the sole and can sometimes stretch almost to its center. Tentacles and head are almost always darker than the rest of the slug. Mucus is thick, sticky and colourless. Tubercles are large, but can often appear flattened. Juveniles can be strongly banded and are often brighter in colour.