Survey and Morphology of Selected Groups of Early Land Plants

形态学和解剖学的详细研究 保存完好的早泥盆世植物分类群，可参考三分体植物或 的问题的亲和力提出。 在以下方面有用的字符 确定它们与主要蕨类植物的可能关系 群，细化分类学的界限，和假设 结构或谱系的分歧模式应该产生。 具体项目包括研究裸藻和Pertica- 从加拿大和德国引进相关植物， 描述了三分体植物的特征，并提出了 与其他植物类群的亲缘关系。 绦虫- 将检查模式轴以确定分类群的数量 并评估他们的关系。 额外 关于遗骸形态和亲缘关系的信息， 将获得推定的配子体Caliculiphyton。 为此目的，仍在研究几种动物甾醇类型 更好地评估属和种之间的关系。 一 各种技术，包括脱溶剂，酸浸渍， 薄片切片、扫描电镜观察、全株重建、 结构同源性假说和系统发育分析 将酌情采用各种方法。 这项研究将 扩展和改进了系统发育中有用的特征阵列 和进化分析，产生了新的假设， 一些血统的关系，并提供新的信息 关于早泥盆世植物群的组成和多样性， 加拿大东南部。

Detailed investigation of morphologically and anatomically preserved Early Devonian plant taxa referable to trimerophytes or of problematical affinities is proposed. Characters useful in determining their possible relationships to major pteridophyte groups, refining taxonomic circumscriptions, and postulation patterns of divergence of structures or lineages should result. Specific projects include study of Psilophyton and Pertica- related plants from Canada and Germany in order to better characterize the trimerophytes and to develop hypotheses of phylogenetic relationships with other plant groups. Taeniocrad- type axes will be examined to determine number of taxa represented and to evaluate their relationships. Additional information about morphology and affinities of remains similar to the putative gameotophyte Caliculiphyton will be obtained. Several zosterophyll types continue to be studied for the purpose of better evaluating generic and species relationships. A variety of techniques, including degagement, maceration in acids, thin-sectioning, SEM observation, whole plant reconstruction, hypotheses of homology of structures, and phylogenetic analytical methods will be employed as appropriate. This research will expand and improve the array of characters useful in phylogenetic and evolutionary analyses, generate new hypotheses of relationships of some lineages, and contribute new information about the composition and diversity of early Devonian floras of southeastern Canada.