Smithsonian paleontologists discover the first tooth of giant beaver found in Maryland, recovered from Chesapeake Bay's Tilghman Island, which is being devoured by wave erosion. Read about this and their other amazing prehistoric finds in SISP's newest paleobiology publication.
This revision of the grasses of Chihuahua includes 385 species in 95 genera, 15 subspecies, 29 varieties, and 4 forms. Included are keys for determination, detailed descriptions, nomenclatural synonyms, ecological information on habitat, distribution based on herbarium specimens, and illustrations for 251 species and 8 varieties. A new combination for Cenchrus polystachios subsp. setosus is also published.
Species of coralline algae of the genus Phymatolithon that occur in the Boreal–Subarctic transition zone of the North Atlantic are segregated systematically by a statistical/developmental analysis of their morpho-anatomical characters. Variations in vegetative tissue morphology, particularly with respect to cell division and elongation patterns, as well as variation in conceptacle (reproductive structure) location and development, are the result of a complex of genetic and environmental factors.