作者

DEVOL, CHARLES E.

型態特徵

Small floating ferns; horizontal stem very short, vegetative reproduction rapid; roots borne singly or in groups, unbranched. Leaves imbricating, upper aerial lobe covered with papillae, often turning reddish in winter and in hot summer; with a cavity near base, containing Anabaena; lower submersed lobe only l cell thick. Sporocarps usually borne in pairs; microsporocarp globose, containing long stalked microsporangia; microspores imbedded in massulae; megasporocarp ovoid, smaller, containing a basal megasporangium above which may be a collar, and then 1 or 2 tiers of floats with an apical flagellate funnel-like zone.

屬

A family of one genus.

參考文獻

作者

DEVOL CHARLES E.

型態特徵

A family of small floating ferns; stems horizontal, vegetative reproduction rapid due to fragmentation; roots absent. Leaves of two types:floating green leaves in pairs, the midrib distinct, the upper surface covered with papillae, the under-surface covered with straight multicellular hairs; submersed leaves finely dissected, root-like. Sporocarps borne in a cluster on a branch of the root-like leaf, globular or ovoid,m covered with multicellular hairs, extemal appearances alike, some containing megasporangia, others microsporangia; being borne on the much-branched receptacles.

參考文獻