bryophyte

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

丝体：中直接由孢子萌发形成的结构称为丝体。

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

假根：在一些藻、和裸子配子体中存在的由单个细胞形成的似根的结构。