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

苔物中直接由孢子萌发结构称为原丝体。

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

在一些类、苔物和裸子物配子体中存在由单个细胞类似根结构。

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

摘要樟子松大孢子母细胞经一系列变化，发育雌配子体。