Title: Glossostigma cleistanthum
Content: Limosella subulata, Myriophyllum tenellum" and "Heteranthera multiflora." It grows quickly and due to its small size is not expected to interfere with recreational boating or other forms of recreational lake use. In some areas it can reach densities as large as 25,000 plants per square meter. Although it is unclear how "G. cleistanthum" was originally introduced to the United States, one possibility is that it was introduced along with aquarium plants. Subsequent dispersal is expected to be due to migrating waterfowl, watersheds, boating and fishing activities. Glossostigma cleistanthum Glossostigma cleistanthum, also known as mudmat, is a freshwater aquatic plant native

Title: Aquatic plant
Content: Although most aquatic plants can reproduce by flowering and setting seed, many also have extensive asexual reproduction by means of rhizomes, turions, and fragments in general. One of the largest aquatic plants in the world is the Amazon water lily; one of the smallest is the minute duckweed. Many small aquatic animals use plants like duckweed for a home, or for protection from predators, but areas with more vegetation are likely to have more predators. Some other familiar examples of aquatic plants might include floating heart, water lily, lotus, and water hyacinth. Based on growth form, macrophytes can be classified

Title: Marsilea
Content: minuta" Marsilea Marsilea is a genus of approximately 65 species of aquatic ferns of the family Marsileaceae. The name honours Italian naturalist Luigi Ferdinando Marsili (1656–1730). These small plants are of unusual appearance and do not resemble common ferns. Common names include water clover and four-leaf clover because the long-stalked leaves have four clover-like lobes and are either held above water or submerged. The sporocarps of some Australian species are very drought-resistant, surviving up to 100 years in dry conditions. On wetting, the gelatinous interior of the sporocarp swells, splitting it and releasing a worm-like mass that carries sori, eventually

Title: Heteranthera dubia
Content: Heteranthera dubia Heteranthera dubia is a species of aquatic plant known by the common names water stargrass and grassleaf mudplantain. It is native to North and Central America where it is widespread from Canada to Guatemala. It lives submersed in freshwater such as rivers and lakes. It is quite variable in appearance. The leaves are different sizes and shapes across individuals, partly genetic variation and partly response to water conditions, for example, the speed and turbulence of surrounding currents. Submersed individuals also have a different stem and leaf morphology from those that occur partially or completely out of the water.

Title: Orontium aquaticum
Content: identified in the literature as being a spathe. Orontium aquaticum Orontium aquaticum , sometimes called golden-club, floating arum, never-wets or tawkin, is a species of flowering plants in the Araceae family. It is the single living species in the genus "Orontium", which also contains several extinct species described from fossils. "O. aquaticum" is endemic to the eastern United States and is found growing in ponds, streams, and shallow lakes. It prefers an acidic environment. The leaves are pointed and oval with a water repellent surface. The inflorescence is most notable for having an extremely small almost indistinguishable sheath surrounding the

Question: What name is given to the microscopic plants found in great numbers in rivers, lakes, and oceans?
Answer: Algae