块状原丝体的产生紧随其后，其次是茎丝体、绿线体和次生根丝体。
The production of massive protonema immediately follows and then caulonema, chloronema and secondary rhizoides.
但原植体耐光性比藻丝体强，说明在野外胶鞘对保护发菜免受强辐射伤害有重要意义。
But photostability of thallus is better than that of filament, which means sheath can protect cells form radiation.
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