New and interesting records of Argentinian Ricciaceae (Marchantiophyta) and hornworts (Anthocerotophyta)

A list of eight species belonging to Marchantiophyta (Ricciaceae) and ten species to Anthocerotophyta (Anthocerotaceae, Dendrocerotaceae, Notothyladaceae and Phymatocerotaceae) collected in several provinces of Argentina is presented. Five species are new records for the Argentinian bryophyte flora: Riccia limicola, R. weinionis, Anthoceros macounii, A. venosus and Phaeoceros microsporous. Riccia paranaensis and Ricciocarpos natans, collected in Corrientes are new reports from this province; Riccia lamellosa and R. squamata are new records from La Pampa, R. lindmanii from Misiones and Nothoceros endiviifolius from Salta. Four species are second national and provincial records: Riccia australis from Misiones, Phymathoceros bulbiculosus from Corrientes, Phaeomegaceros squamuliger from Neuquén, and Anthoceros lamellatus in Tucumán. For each species, ecology and distribution data for Argentina and South America are given.