The anther possesses four microsparangia with its wall composed of four layers : epidermis , endothecium , middle layers and a 2 - nucleate celled tapetum . most of the antheral tapetum are in situ 单穗升麻的花药具4个小孢子囊药室，囊壁花药壁由表皮药室内壁中层和绒毡层组成。
2.
The task selects the up to the minute mesoscale numerical model as our forecasting model and use thrice fixed nesting and terrain datum of down to dale ( highest precision data of 30s ) as our terrain datum in the endothecium 本文选择了当今最为先进的中尺度数值模式mm5v3作为数值预报模式，采用三层固定网格嵌套，选用其最新提供的30s高精度资料作为内层重点考察小区的地形资料。
