Upper carboniferous rugose corals from eastern kunlunshan , china 东昆仑山西段上石炭统的四射珊瑚
2.
They are globose , subglobose , oblate and prolate in shape . the germination apertures are absent , or present and are irregularly poroid , 3 - colpate , 4 - colpate , 3 - 4 - colpate , pantocolpate and 3 - colporate . the exine ornamentation is spinulose , tuberculate , variously striate , striate - foveolate , striate - reticulate , rugose - sinuate , minutely reticulate and reticulate 条纹网状、皱波状、细网状和网状c沟膜近光滑、具小颗粒、具小刺状突起或具瘤状突起。
3.
The morphological characteristics are recognized as 3 types : nearly globe , nearly boat shape and nearly shield shape . the exine ornamentation can be divided into 5 types : reticulate , steiate - veticulate , tuberculate , verrucate and rugose - sinuate . the morphological characteristics show some vaviations among sections and species in terms of the shape of pollen and the exine ornamentation . and thus can be used as one of characters in the consideration of the classification of this genus . ( 4 ) the micromorphology of the seed coats were observed in 13 species （ 4 ）所观察的该属13种植物的种皮表面纹饰可分为网纹、负网纹和皱波状三大类，且各个种之间在种皮微形态上均存在着一定差异，可以作为分种的依据；在组间，除属于有苞组( sect . amana )的t . edulis和其它组的种类有明显差异外，其余3组之间没有明显的界限，说明郁金香属的种皮微形态特征在组的划分上意义不大，但在种的划分上具有一定的分类学意义。
