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

苔物中直接由孢萌发形成的结构称为原丝体。

Macrospore metrocyte of Pinus sylvestris var. mongolica developed to female gametophyte containing female gamete-egg by a series of changes.

摘要樟松大孢母细胞经一系列变化，发育成雌配体。

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

在一、苔物和裸物配体中存在的由单个细胞形成的似根的结构。