''Isoetes melanospora'', commonly known as black-spored quillwort or black-spored Merlin's grass, is a rare and endangered aquatic

lycophyte The lycophytes, when broadly circumscribed, are a vascular plant (tracheophyte) subgroup of the kingdom Plantae. They are sometimes placed in a division Lycopodiophyta or Lycophyta or in a subdivision Lycopodiophytina. They are one of the oldes ...

endemic to the

U.S. states In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

and

South Carolina )'' Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...

. It grows exclusively in shallow, temporary pools on granite outcrops, often with only 2 cm of soil. 11 populations are known to exist in Georgia, while only one has been recorded in South Carolina, though this population is believed to be

extirpated Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...

. The number of sites has dropped from 18 following its discovery due to

habitat destruction Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...

caused by quarrying, trash dumping and trampling. New leaves quickly sprout after fall and winter rains, but during the dry summer months these typically shrivel. ''Isoetes melanospora'' is a small plant growing in mud or shallow water but becoming terrestrial as the ground dries. Rootstock is nearly spherical. Leaves are up to 7 cm (2.8 inches) long, spirally arranged, tapering to the tip.

Megaspores Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. These plants have two spore types, megaspores and microspores. Generally speaking, the megaspore, or large spore, germinates into a female gametoph ...

are gray or black, 350-480 μm in diameter.

Microspores Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes. The male gametophyte gives rise to sperm cells, which are used for fertilization of an egg cell to form a zygote. Megaspor ...

appear brown, each 26-31 μm across.Flora of North America, ''Isoëtes melanospora'' Engelmann, 1877. Black-spored quillwort
/ref> The black-spored quillwort, a federally listed endangered species, is sometimes found growing with pool sprite (''Amphianthus pusillus''), another imperiled plant species. Both are protected at

Stone Mountain Stone Mountain is a quartz monzonite dome Inselberg, monadnock and the site of Stone Mountain Park, east of Atlanta, Georgia. Outside the park is the small city of Stone Mountain, Georgia. The park is the most visited tourist site in the state o ...

in Georgia.USFWS
Granite Outcrop Plants Five-year Review.
September 2008.

References

External links

Profile at USDA PLANTS Database
*
Illustration from Flora of North America
melanospora Flora of the Southeastern United States Critically endangered flora of the United States Plants described in 1877 {{Lycophyte-stub