Isoetaceae
Isoetaceae A family of Pteridophyta, mostly aquatic vascular cryptogams with 2 types of spore (see HETEROSPORY). They have a short, stout, basal stock from which arise the roots below, and a dense rosette of usually tubular, quill-like leaves, which bear the sporangia sunken in their expanded bases. The first leaves of the season produce megasporangia in their bases which contain large megaspores that develop into female gametophytes. Microsporangia are produced in later leaves and contain tiny microspores which develop into minute male gametophytes. There are 2 genera, Isoetes (quillworts), with some 70 species of cosmopolitan distribution, and Stylites, with 1 species in the Peruvian Andes.
More From encyclopedia.com
Araceae , Araceae A major family of monocotyledons (Monocotyledoneae), comprising tiny to giant herbs and many bole climbers, which produce sap with irritant c… Cycad , cycad •ad, add, Allahabad, bad, Baghdad, bedad, begad, cad, Chad, clad, dad, egad, fad, forbade, gad, glad, grad, had, jihad, lad, mad, pad, plaid, r… Cycadophyta , Cycadophyta (cycads) A division of gymnosperms comprising plants with leaves and habit similar to those of palm trees, although some species are quit… Panama-hat Palm , Carludovicia (family Cyclanthaceae) A genus of trees which have a short stem and tufted, palmate leaves. The flowers are borne on a spadix which at f… Selaginella , Selaginellaceae A family of the Pteridophyta in the wide sense, or of the Lycopsida in the narrower sense, of plants similar to the clubmosses (Lycop… Microsporangium , microsporangium A sporangium (e.g. in heterosporous (see HETEROSPORY) ferns and the clubmoss Selaginella) that produces numerous minute spores which…
About this article
quillwort
All Sources -
You Might Also Like
NEARBY TERMS
quillwort