Search results
Results from the WOW.Com Content Network
The life of a liverwort starts from the germination of a haploid spore to produce a protonema, which is either a mass of thread-like filaments or a flattened thallus. [ 18 ] [ 19 ] The protonema is a transitory stage in the life of a liverwort, from which will grow the mature gametophore (" gamete -bearer") plant that produces the sex organs.
Marchantia polymorpha grows on shaded moist soil and rocks in damp habitats such as the banks of streams and pools, bogs, fens and dune slacks. [1] While most varieties grow on moist substrates, Marchantia polymorpha var. aquatica is semi-aquatic and is often found invading marshes, as well as small ponds that do not have a consistent water table.
The sporophyte consists of an unbranched stalk called a seta, which bears a terminal spore capsule called a sporangium. [25] The sporangia of Conocephalum are borne beneath stalked gametophytic structures called archegoniophores. [4] In contrast to mosses, the sporophyte matures before the seta elongates.
In botany, "seta" refers to the stalk supporting the capsule of a moss or liverwort (both closely related in a clade called "Setaphyta"), and supplying it with nutrients. The seta is part of the sporophyte and has a short foot embedded in the gametophyte on which it is parasitic .
Two rows of lobes extend laterally outwards from this axis, and there are small upright lobules at the base of each. The entire liverwort is around 1.5 cm wide and 4–9 cm long. There are mucus-covered hairs around the rhizoids and sex organs. [1] The sporophyte rises from around the apex of the lobe, and has a very large seta and relatively ...
Sporangia brown, nearly spherical, with very short seta, three to seven per receptacle, each opening by a lid; mauring in early spring. [6] Spores brown, 35-450 um, more or less distinctly tetrahedral, irregularly areolate-lamellate, with a pellucid margin. The elaters are attenuate, 300-450 um contorted, often branched, and spiraled. [6]
Conocephalum conicum, also known as the great scented liverwort or snakeskin liverwort, is a liverwort species in the genus Conocephalum. [1] C. conicum is part of the Conocephalum conicum complex, which includes several cryptic species. [2] The name C. conicum refers to the cone-shaped archegoniophore, which bear sporangia. [3]
They are distributed globally in almost every available habitat, most often in humid locations although there are desert and Arctic species as well. [ 2 ] 23,420 species of vascular plant have been recorded in South Africa, making it the sixth most species-rich country in the world and the most species-rich country on the African continent.