Pepe River is one of the Bengawan Solo with a reasonably high level of water pollution due to the habit of the surroundings in throwing garbage into the river. Plants that can survive in polluted land conditions have a high tolerance level, called pioneer plants. One of them is ferns (Pteridophyta). This study aims to identify the type, abundance, Important Value Index (IVI), and index Diversity of pteridophytes plant diversity in the Pepe Watershed. The method used in this research is descriptive quantitative using the quadrat sampling technique method with a 1x1 meter plot. The sampling technique is using purposive sampling. Data analysis was conducted qualitatively and quantitatively. Analysis of diversity index data (H’) by Shannon-Wiener. Based on the results of the study found eight species of ferns from 5 families. There are Pteris vittata, Pteris biaurita L., Adiantum lunulatum Burm.fil., Adiantum latifolium Lam., Adiantum hispidulum Sw, Marsilea crenata C. Presl, Microlepia speluncae (L.) T. Moore, and Asplenium scandicinum Kaulf. This diversity is included in the medium category with H'= 1.44. The fern with the highest abundance was Pteris vittata with 176 individuals, a density of 5.87 individuals/m2, a frequency of 0.53, and an IVI of 109.3%. Set side by set, the lowest abundance was Microlepia speluncae with eight individuals, a density of 0.27 individuals/m2, a frequency of 0.03, and IVI of 5.6%. Based on this, ferns can survive in polluted river areas. Information on the diversity of ferns found on critical land, especially rivers, is expected to provide initial information in overcoming other similar critical lands.

<div>This study examines the extend to the applicability of diplomatic immunity rights for senior officials against gross human rights violations they have committed. Toa achieve such aim, the author analysed the different types of immunity granted by international law to state officials, the reasons for the conferment of this immunity, and whether they apply in cases in which it is alleged that an official has committed an international crime. By using a statutory and case approach, the author examines several cases heard before international courts to compare the implementation of immunity rights. The author argues that both immunity ratione materiae and immunity ratione personae cannot be applied to cases that constitute gross violations of human rights. Moreover, instead did not agree with the argument which have been put forward by scholars and ICJ in support of the contrary.</div>