Marchantia polymorpha (weed)
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Marchantia polymorpha (weed) L. - (liverwort)
This is a moss-like weed which is common in moist areas of nurseries and greenhouses. The plants have a flat, undifferentiated base, up to 2 cm wide which has root-like structures underneath. It belongs to the phylum of Marchantiophyta and the family Marchantiaceae. The plants can propagate vegetatively by forming branches which become new plants.
They can also reproduce sexually and there are male and female plants which grow umbrella-like reproductive organs which have stalks and are up to 10 cm high, the gametophores. Female gametophores have a star-like structure on top of the stalk, which produces ova. Male gametophores have a flat disk on top of the stalk and produce sperms.
For details see the respective page in Wikipedia.