Some species are facultative parasites of plants (including crops) and of lichens.

It is a facultative parasite of nematode eggs.

Facultative parasite - a parasite that can complete its life cycle independent of a host.

The fungus continues to decay wood after the host tree has died, making K. deusta a facultative parasite.

Only a single species is known, Rhynchogastrema coronatum, isolated from soil, and probably a facultative parasite of other fungi.

The results of the study suggest that this fly is a facultative parasite of this frog and other amphibians.

Semispecific is synonymous to facultative parasite.

A facultative parasite is an organism that may resort to parasitic activity, but does not absolutely rely on any host for completion of its life cycle.

Growth is most rapid at 24 C. It is a facultative parasite of sea stars in the Asteriidae family.

This species is a facultative parasite, or hemiparasite, in that it can live without attaching to another plant but will parasitize if presented with the opportunity.

As such, in recently formed and facultative parasites, there is an accumulation of pseudogenes and transposable elements due to a lack of selective pressure against deletions.

Its members are primarily facultative parasites and commensals of humans and other animals, living in and around the sweat glands, sebaceous glands, and other areas of the skin.

It can, however, also be a facultative parasite of lichens and can additionally be a plant pathogen (typically found in its asexual Fibulorhizoctonia carotae state), causing "crater rot" of stored carrots.

Despite records of its parasitic behavior, submersible encounters with free-swimming juveniles and adults, and their capture in baited traps, suggest that this species is at most a facultative parasite that opportunistically enters sick and dying fish.