萬年松雄配子之生 I.由小孢子至精原細胞的發育

Spermatogenesis in Selaginella tamariscina (Beauv.) Spring I. From Microspore to Spermatid

本文研究萬年松Selaginella tamariscina (Beauv.) Spring由成熟的小孢子發育成精原細胞（spermatid）之過程。小孢子第一次分裂產生的原葉體細胞（prothallial cell）位於離心極（distal pole），宿存。雄配子始源細胞（antheridial initial）第一次分裂之分裂面與小孢子之赤道面平行。精原細胞（spermatid）含有一對中心粒，中心粒下方有四層由微小管（microtubule）及微纖維（microfibril）組成之「多層結構」（multilayered structure）。

The spermatogenesis in Selaginella tamariscina (Beauv.) Spring is studied from the mature microspore to the spermatid. The persistent prothallial cell produced by the first division of the mature microspore situates at the distal pole. The plane of the first division of the antheridial initial is parallel to the equator of the microspore in the majority of specimens. The spermatid is characterized by containing a pair of parallelly oriented centrioles and multilayered structure which is composed of four layers.