药用植物沙参的传粉生物学研究

药用植物沙参Adenophora hunanensis Nannf,在自然授粉中结实率约为8％,其花柱的授粉率较高,达70％,为结实率的8．75倍,柱头上的平均花粉量为5－16个,但多数来自自花的花粉,散粉期花粉活力较高,从不同处理下的结实率实验看,沙参的有性繁殖主要依靠异花授粉,其自花授粉的结实率为0．6％,作者认为,在影响结实率的诸多因素中,异花授粉的效率以及植物对异花授粉的依赖程度是重要因素。     

Skara hunanensis a new species of Skaracarida (Crustacea) from Upper Cambrian (Furongian) of Hunan,south China

The fossils of Orsten-type preservation are as famous as Chengjiang Fauna in the world,but it was not until 2005 that the Orsten-type fossils represented by Skaraearida and Phosphatocopida were first reported to be found in western Hunan,South China. Here,we report the systematic paleontology of all the exquisitely preserved specimens belonging to Skaraearida.They were found at a same horizon of Upper Cambrian (Furongian) in Wangcun section,western Hunan,south China,assigned to a new species Skara huna- nensis herein.Skara hunanensis is characterized by small,soft-integumented,marine forms with slender,annulate body;labrum large and ventrocaudally directed;uniramous antennulae;biramous antennae and mandibulae;maxillas and maxillipeds of the same shape;all postantennular limbs join a short cephalic filter apparatus.The body has two tagmata:a cephalon with five pairs of well developed ap- pendages and a trunk composed of 11 ring-shaped conical segments.     

亚香棒虫草菌的纯培养分离和鉴定

亚香棒虫草(Cordyceps hawkesii Gray)的活体材料采自湖南省桃江县。用虫草的虫体、菌柄、子座、及子囊孢子进行了纯培养分离,结果获得了分生孢子阶段的真菌的纯培养物。经鉴定分离到的菌体为亚香棒虫草的无性阶段。亚香棒虫草的寄主昆虫为蝙蝠蛾科的湖南棒蝠蛾(Napialus hunanensis)。