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

苔藓植物中直接由孢子萌发形成的结构称为原丝体。

The effects of different concentrations of arsenic on spore germination and rhizoid and prothallium growth of Pteris vittata under aseptic condition were studied.

研究无菌条件下不同浓度砷对蜈蚣草的孢子萌发、假根和原叶体生长发育的影响。