ABSTRAKAnggrek terestrial merupakan salah satu jenis anggrek yang hidup di tanah. Permasalahan saat ini yaitu perusakan habitat yang dapat mengancam keberadaan anggrek (Destri et al., 2015). Nugroho dan Darwiati (2007) menjelaskan bahwa dari 8 desa di Kecamatan Senduro yang dikaji, 6 desa termasuk kategori riskan dan 2 dalam kategori rawan dimana keduanya dapat menimbulkan gangguan kawasan. Oleh karena itu, sangat penting dilakukan eksplorasi dan inventarisasi dengan tujuan untuk mengetahui keanekaragaman jenis anggrek terestrial di Taman Nasional Bromo Tengger Semeru, Blok Ireng-Ireng. Penelitian dilakukan bulan Januari hingga Maret 2018. Metode yang digunakan yaitu deskriptif eksploratif dengan mengambil sampel secara acak. Secara teknik menggunakan metode garis berpetak dengan 30 plot pengamatan dalam 5 jalur pengamatan. Dari penelitian ini telah berhasil ditemukan dan diidentifikasi 20 spesies dalam 14 genus dengan total 959 individu tumbuhan anggrek terestrial. Corymborkis veratrifolia (Reinw.) Bl merupakan spesies yang ditemukan mendomidasi dalam jumlah individu sebanyak 246 tumbuhan, sedangkan Erythrodes sp. ditemukan dalam jumlah kecil masing-masing sebanyak 3 individu tumbuhan. Adapun hasil penelitian ini dapat dijadikan sebagai informasi keaneka-ragaman anggrek terestrial di Taman Nasional Bromo Tengger Semeru, Blok Ireng-Ireng, Kecamatan Senduro, Kabupaten Lumajang. ABSTRACTTerrestrial orchid is one kind of orchid that lives on the ground. The current problem is habitat destruction that affecting the existence of orchids (Destri et al., 2015). Nugroho and Darwiati (2007) explained that 6 of 8 villages in Senduro Sub-District belong to the risk category and 2 villages in the vulnerable category. It could cause regional disturbance. Therefore, exploration and inventory are important to find out the diversity of terrestrial orchid in Bromo Tengger Semeru National Park, Ireng-Ireng Block. The study was conducted from January to February 2018. The research method was descriptive exploration with using random sampling. Technically, used combination of line and plot as method at 30 experimental plots in 5 observation lines. From the exploration was found and identified 20 species in 14 genera with total of 959 individual plants. Corymborkis veratrifolia (Reinw.) Bl is a species that found in the largest number and dominates as many as 246 individuals, while Erythrodes sp. was found in small group of 3 individuals. The results of this study could be used as an information of the
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