Clusiaceae s.l. (Calophyllaceae, Clusiaceae s.s. and Hypericaceae) in the Viruá National Park, Roraima, Brazil

Observations on a fragilarioid diatom found in inter-dune lakes of the Badain Jaran Desert (Inner Mongolia, China), with a discussion on the newly erected genus Williamsella Graeff, Kociolek & Rushforth

A taxonomic revision of the western South American genus Presliophytum (Loasaceae)

Reappraisal of Campanula rotundifolia var. bulgarica Nejceff—a neglected taxon from Central Stara Planina Mountain, Bulgaria

Prodromus of a fern flora for Bolivia. XIII. Anemiaceae

Prodromus of a fern flora for Bolivia. XII. Lygodiaceae

Prodromus of a fern flora for Bolivia. XIV. Schizaeaceae

Prodromus of a fern flora for Bolivia. XV. Marsileaceae

Prodromus of a fern flora for Bolivia. XVI. Salviniaceae