bryophyte

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

原丝体：物中直接由孢子萌发形成的结构称为原丝体。

2.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、物和裸子物配子体中存在的由个细胞形成的似根的结构。