国产菟丝子属种子形态的观察

本文观察了中国产菟丝子属种子的形态和种皮表面的超微结构。菟丝子属种子表面特征如下：种脐呈衣领状突起或与晕轮面平齐或下陷；晕轮细胞呈近放射状排列或网状排列或不规则排列；种皮表面呈条纹状纹饰或脑纹状纹饰或网状纹饰，纹饰上有时具瘤状突起或块状附属物。根据上述特征，可将菟丝子属种子分成三种类型。种皮纹饰可作为分类鉴定和种子检疫的依据。

Surface Ultrastructure of Seeds of Chinese Cuscuta

The surface ultrastructure of seeds of chinese Cuscuta was observed underSEM. The main results are as follows: the seed surface could be divided intothree parts: hilum, hilum-rim and spermoderm. The hilum is collar-shaped orhigher or lower than level of hilum-tim. Hilum-rim cells are mostly radiately ar-ranged and less frequently in reticulate or other types of arrangement.  Thespermoderm shows at least three patterns of ornamentation, cerebelloid, striateor irregular, on which some tuberculate or small clumps of granules could befound sometimes According to the surface ultrastructure of the hilum, hilum-rimand spermoderm, the observed dodder seeds could be divided into three types.The surface characters of dodder seeds are also important both for diagnosis ofspecies and for quarantine of dodders.