石松纲

The middle and upper layers may be composed of Lepidodendron , Cordaites, Calamites and some tree ferns or seed ferns.

群落的中、高层通常是石松纲和科达纲，楔叶纲中Calamites及某些树蕨和种子蕨。

Eusporangiate Describing the condition, found in clubmosses, horsetails, and certain ferns in which the sporangia develop from a group of initial cells and do not have an elaborate spore dispersal mechanism.

厚囊蕨：用来描述发现于石松纲、木贼类以及一些蕨类植物，其孢子囊由一组原始细胞发育而来，没有复杂的孢子散布机制。

On this basis, the cladistic analysis (Kenrick and Crane, 1997) recognized three lineages among the vascular plants (including the fossil and living plants): the Lycophytina, Euphyllophytina and Rhyniopsida.

在此基础上，Kenrick和Crane（1997）根据分支系统学的分析将维管植物划分为三个谱系：石松植物亚门，真叶植物亚门和莱尼蕨纲。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。