Abstract

Chaetostylum van Tiegh. & le Monnier is reduced to Helicostylum Corda. H. venustellum Lythgoe is proposed as a new species and H.fresenii (van Tiegh. & le Monnier) Lythgoe as a new combination. The terminal sporangium has a Mucor -typc of columella, except in H. piriforme Bain. with a Rhizopus -type. A hemispherical columella is shown to occur in the sporangioles of H. elegans Corda and seems to occur also in H. venustellum . It is not apparent in H.fresenii . H. piriforme Bain. has pedicels growing in pairs on short dichotomously forked branches.

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