Search results
Results from the WOW.Com Content Network
Pellia epiphylla (sometimes known as overleaf pellia [1] or common pellia) is a species of thallose liverwort. It occurs in North America, Europe, North Africa and parts of Asia. [2] It grows in patches in damp, sheltered places on neutral or acidic substrates. It is common on the banks of rivers, streams and ditches and also grows in wet ...
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 is a species of large thalloid liverwort in the class Marchantiopsida. [1] M. polymorpha is highly variable in appearance and contains several subspecies. [2] This species is dioicous, having separate male and female plants. [2] M. polymorpha has a wide distribution and is found worldwide. [3]
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.
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]
Marchantia is a genus of liverworts in the family Marchantiaceae and the order Marchantiales.The genus was named by French botanist Jean Marchant after his father.. The thallus of Marchantia shows differentiation into two layers: an upper photosynthetic layer with a well-defined upper epidermis with pores and a lower storage layer.
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 ...