English: Quillworts; Spikemosses; Scale trees.
Synonym: Isoëtales.
Clades:
Isoetidae;
Isoetanae;
Pteridophyta;
Plants.
Members: 1 family
Isoetaceae.
Region: cosmopolitan; scarce to rare.
Habitat: aquatic; clear ponds, slowly moving streams.
Plant theoryIsoetales is the only member of the Subclass
Isoetidae and class
Isoetanae. It has only one member
Isoetaceae, placed in
Phase 1. This is the common situation in the
Hydrogen series.
TaxonomyIn the Ppg1 classification
Isoetales is placed in the subclass
Isoetidae, together with Selaginellales.
BotanyFern; primitive; heterosporous; aquatic or semi-aquatic.
Root: rhizophorous, rhizomorphous; bulb-like, underground corm.
Stem: non-protostelic.
Leaves: ligulate; slender, broadens downward to a swollen base; up to 5 mm wide; attach in clusters.
Reproduction: male and female sporangia at the base; protected by a thin, transparent covering, velum.
Spore: heterosporous.
FamiliesNr
Series Remedy code Name
1 Hydrogen 3-411.11.00
Isoetaceae