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Pilularia Americana-rangemap
''Pilularia'' or pillworts is a genus of unusual ferns of family Marsileaceae distributed in North Temperate regions, Ethiopian mountains, and the southern hemisphere in Australia, New Zealand, and western South America. Depending on the taxonomic revisor, the genus contains between 3 and 6 species of small plants with thread-like leaves, and creeping rhizomes. The sporangia are borne in spherical sporocarps ("pills") which form in the axils of leaves. ''Pilularia minuta'' from SW Europe is one of the smallest of all ferns. List of species Recent work from Pryer Lab accepted four species of ''Pilularia'', with a fifth, ''P. novae-zealandiae'', being conspecific with ''P. novae-hollandiae''. In addition, another species, ''P. dracomontana'', has been described from South Africa. * ''Pilularia americana'' A.Braun (American pillwort) * ''Pilularia globulifera'' L. (pillwort) * ''Pilularia minuta'' Durieu (least pillwort) * ''Pilularia novae-hollandiae'' A.Braun (austral pillwort) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pilularia Globulifera
''Pilularia globulifera'', or pillwort, is an unusual species of fern in the family Marsileaceae. It is native to western Europe, where it grows at the edges of lakes, ponds, ditches and marshes, on wet clay or clay-sand soil, sometimes in water up to deep. Description Pillwort has slender, cylindrical, rush-like fronds up to tall that are shaped like croziers as they unfurl. It has a pea-shaped, 4-chambered sporocarp about in diameter, each chamber formed from a modified leaf and containing several sori bearing both megasporangia and microsporangia. The species is thus heterosporous. Habitat Pillwort grows on silt and mud at the margins of lakes, ponds and other watercourses that are submerged for at least part of the year. Some of the plants growing in association with this species in the UK include water celery ('' Apium inundatum''), marsh pennywort (''Hydrocotyle vulgaris'') and lesser spearwort ('' Ranunculus flammula''). In its habitat in shallow water on pond m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |