Cyathodium bischlerianum, sp nov. (Marchantiales) a new species from the Neotropics

Cyathodium bischlerianum is described as a new Neotropical species from pan ama. The species is distinguished by its slender delicate thallus; a promin ent dorsal pore at base of involucre; monoicous condition with 1-2 archegon ia per involucre, and male receptacles on sides of thallus; sporophytes wit hout operculum; cells of upper third of capsule with bar-like thickenings; elaters attached to base of capsule wall with 3-4 bands; and spinose-bulbos e spores. This species resembles the Asiatic C. aureonitens in spore orname ntation but its monoicous condition, lack of operculum, naked involucre, an d ornamentation of upper capsule cells separate it from its Asiatic relativ e. It is also related in morphology, sexual condition, and spore ornamentat ion to C. cavernarum.