原丝体

The fern spore, the original cell of the gametophyte, carries out asymmetrical mitosis to produce a large cell and a small cell. The small cell geminates to a rhizoid by tip growth, and the large cell further divides and develops to become a prothallus.

蕨类植物孢子作为配子体的原始细胞，通过不对称的有丝分裂产生一大一小两个细胞，小细胞萌发出极性生长的假根，大细胞继续分裂发育为原叶体。

This paper sums up the study history and present situation about moss spore germination and protonema developmemt, clarifying the important scientific significance.

本文综述了国内外对藓类植物的孢子萌发和原丝体发育过程的研究历史和现状，阐明了此项研究的重要科学意义。

Spore germination and protonema development have been considered to be one of the important characters in the phylogeny and evolution of major groups of the bryophytes and other plant groups.

孢子萌发与原丝体发育对于研究苔藓植物以及其他植物类群的系统发育与系统演化有着十分重要的作用。

In plant kingdom, having a protonema stage after spore germination is a specific character of moss and a marked difference compared with other plant group.

在植物界，孢子萌发后的原丝体发育阶段是藓类植物所独有的特征，也是该类群区别于其它类群的一个显著特点。

The primary rhizoid exists or not. At the end, the characteristics of the protonema growth is analyzed and discussed. The sporeling type of E. ciliata is primarily named as Encalypta-type.

同时，还对大帽藓原丝体发育的特征进行了分析和讨论，初步确定大帽藓孢子萌发属于新的孢子萌发类型——大帽藓型（Encalypta-type）。

Bryophytes ; Spore germination ; Protonema development

苔藓；孢子萌发；原丝体发育

" Composed of filaments or plates of cells, a thallus ranges in size from a single-celled structure to a complex treelike form."

原植体为丝状或片状，大小不一，小的仅数个细胞，大的形态复杂如树状。

"Composed of filament s or plates of cells, a thallus ranges in size from a single-celled structure to a complex treelike form."

原植体为丝状或片状，大小不一，小的仅数个细胞，大的形态复杂如树状。

In this work, properties of acrylonitrile-co-ammonium of itaconic acid system was studied in detail in order to accumulate foundation for high performance carbon fibers.

本文将衣康酸铵作为第二单体，系统研究了丙烯腈-衣康酸铵二元体系作为炭纤维前驱体的特点，以期为开发适用于高性能炭纤维的二元PAN原丝奠定必要的基础。

In this paper the authors report on the biological characteristics of Al-sophila spinulosa Hook.

孢子—原叶体—孢子体的生活周期长，并且在丝状体、原叶体和幼孢子体阶段，无特殊结构去抵抗和忍耐一切不利环境因子的影响。3。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。