There are several interaction patterns of fungus that live in the rhizosphere of plants, i.e. mutualism, commensalism, saprophytism, and parasitism. The objective of this study was to determine the genera of microscopic fungus collected from the rhizosphere of groundnut, mays plant, and rice field. In addition, the diversity of soil fungi of those three plants was considered. Research method applied was survey with purposive sampling. The rhizospheric soil sample was obtained from research locations of groundnut, mays plants, and rice field in Purwokerto area. The soil samples were taken from 1-10 cm deep. Next they were isolated, and then they were purified. Furthermore, the obtained data of fungus collection were then analysed descriptively, and also described based on their macro and micro morphology. Then, the collected fungus were identified by using identification manual for fungus. The result showed that fifteen (15) isolates were found in three different rhizosphere of ground nut, mays plants, and rice field. The description is as follow: Aspergillus-1, Aspergillus-2, Penicillium-1, Penicillium-2, Mycophyta, Aureobasidia, Cylindrocarpon, Mucor-1, Mucor-2, Chaetomium, Gliocladium, Trichoderma-1, Trichoderma-2, Pleurophragmium, and Gonytrichum. Finally, the diversity Index (H’) noted from rhizosphere of groundnut plants was 0.312; mays was 0.195; and (H’) of rice field was 0.124.

生活在植物根际的真菌有几种相互作用模式，即共生、共生、腐生和寄生。本研究的目的是确定从花生、梅斯植物和稻田的根际收集的微观真菌属。此外，还考虑了这三种植物的土壤真菌多样性。采用的研究方法是有目的的抽样调查。根际土壤样品取自Purwokerto地区的花生、梅斯植物和稻田的研究地点。土壤样品取自 1-10 厘米深。接下来它们被分离，然后被纯化。此外，对获得的真菌采集数据进行了描述性分析，并根据其宏观和微观形态进行了描述。然后，采集的菌类通过菌类鉴定手册进行鉴定。结果表明，在花生、梅斯植物和稻田的三个不同根际中发现了十五 (15) 种分离物。描述如下：Aspergillus-1、Aspergillus-2、Penicillium-1、Penicillium-2、Mycophyta、Aureobasidia、Cylindrocarpon、Mucor-1、Mucor-2、Chaetomium、Gliocladium、Trichoderma-1、Trichoderma-2、Pleurophragmium、和Gonytrichum。最后，花生植物根际的多样性指数（H'）为0.312；梅斯为 0.195；和稻田的（H'）为0.124。Aureobasidia、Cylindrocarpon、Mucor-1、Mucor-2、Chaetomium、Gliocladium、Trichoderma-1、Trichoderma-2、Pleurophragmium 和 Gonytrichum。最后，花生植物根际的多样性指数（H'）为0.312；梅斯为 0.195；和稻田的（H'）为0.124。Aureobasidia、Cylindrocarpon、Mucor-1、Mucor-2、Chaetomium、Gliocladium、Trichoderma-1、Trichoderma-2、Pleurophragmium 和 Gonytrichum。最后，花生植物根际的多样性指数（H'）为0.312；梅斯为 0.195；和稻田的（H'）为0.124。