In mosses, the sporophyte developing from the embryo partially depends on the gametophyte. It contains chlorophyll and hence is capable of making its own food. Sporophyte is attached to the photosynthetic gametophyte so that it can get nourishment from the gametophyte. Some cells of the sporophyte undergo meiosis to produce haploid spores. The spores germinate to produce gametophyte. Related Theory When a moss spore germinates it first develops a protonema (sporophyte), a filamentous to sheet-like growth form. the leaves develop on the stems, giving rise to one or more leafy-stemmed plants. The protonema are ephemeral, with the leafy-stemmed plants the persistent and dominant growth form. The leafy-stemmed part is the gametophyte. because it produces gametes. Sex organs are multicellular. Male sex organ is called antheridium and produces biflagellate antherozoids. The female sex organ is called archegonium and produces a single egg.