Calyptridium pulchellum

Calyptridium pulchellum NatureServe Explorer Species Reports — NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports –Calyptridium pulchellum  ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library — The U.S. Fish and Wildlife Service’s National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

In 2007, there were about 9 or 10 occurrences of the plant, with some occurrences made up of two or more small populations.^[1] The total population number varies year to year, generally because of the influence of local weather changes on the germination of seeds and the growth of seedlings. Past total population estimates varied from 1680 to nearly 3000 individuals. Some populations are located on private land and have not been surveyed in many years. Others are quite variable in size, increasing from 58 to 770 individuals, or decreasing from hundreds of plants to only 3.

A major threat to this species is habitat fragmentation; populations have been bisected by roads, dirtbike trails, and firebreaks. At least two populations are in the middle of residential subdivisions, or on the edges; these may be extirpated by now.Residential and commercial development continue to claim the habitat, as does the expansion of infrastructure to support the new development, including local services, utilities, and roads. Livestock are allowed to graze in some areas, but it is unknown if this affects the species. Since most of the populations are small, they are vulnerable to destruction from any one severe local event, such as drought or disease, and since the populations sometimes fall to very low numbers they are at risk for genetic bottlenecks and genetic drift.