Protonema (pl. protonemata) The young bryophyte gametophyte that develops following spore germination.

苔藓植接由孢萌发形成的结构称原丝体。

Rhizoid A unicellular rootlike structure found in certain algae and in the gametophyte generation of the bryophytes and some ferns.

在一些藻类、苔藓植植配体存在的由单个细胞形成的类似根的结构。