Liverwort (Marchantia paleacea) from Cibodas Botanical Garden Bogor Indonesia was used as raw materials in this research. The objective of this research was to assess the potential of antibacterial activity of liverwort (M. paleacea). Maceration using 4 different solvents i.e ethanol, methanol, ethyl acetate, and hexane was used to extract the active compound. The potential of antibacterial activity of the extracts was assesed by agar diffusion method and direct-contact test by determining the minimum inhibitory concentration (MIC). The data showed that the ethanol extract had the biggest inhibition zone on three test bacteria. The inhibition zone and MIC were 10.8 mm and 0.7 mg/ml for S. aureus; 4.5 mm and 8.0 mg/ml for S. Typhimurium; 5.8 mm and 5.9 mg/ml for P. aeruginosa, respectively. The total phenol content of the extract was 22 mg/g. Phenolic, triterpenoid and flavonoid were positively detected in the extracts.

Abstrak. Nasution T, Iskandar EAP, Ismaini L. 2015. Keragaman flora berpotensi dan komposisi vegetasi di Gunung Marapi, Sumatera Barat. Pros Sem Nas Masy Biodiv Indon 1: 1334-1340. Gunung Marapi di Provinsi Sumatera Barat merupakan salah satu gunung berapi paling aktif di Pulau Sumatera. Seringnya terjadi letusan diduga mempengaruhi komposisi vegetasi di area tersebut. Telah dilakukan kegiatan penelitian untuk mengoleksi tumbuhan berpotensi dan melakukan analisis vegetasi di dalam kawasan. Pengoleksian flora berpotensi menggunakan metode survey dengan melakukan penjelajahan dalam kawasan pada ketinggian 1420-2260 m dpl. Analisis vegetasi dilakukan dengan metode belt transect pada zona sub montana. Metode peletakan plot secara purpossive sampling. Sebanyak 151 jenis tumbuhan dikoleksi, termasuk 112 tumbuhan berpotensi. Tumbuhan berpotensi sebagai tanaman hias diantaranya Rhododendron spp., Begonia spp., dan Impatiens spp. Dikoleksi tumbuhan berpotensi sebagai penghasil kayu diantaranya Lithocarpus spp., Exbucklandia populnea, dan Syzygium spp. Gaultheria spp., Gunnera macrophylla, dan Piperaceae merupakan jenisjenis tumbuhan berpotensi sebagai bahan obat-obatan. Tumbuhan yang berpotensi sebagai bahan pangan antara lain Rubus spp., Zingiberaceae, dan Smilax sp. Hasil analisis vegetasi tumbuhan bawah menunjukkan Ophiorriza sp., Elatostema sp., dan Syzygium sp. mendominasi kawasan Gunung Marapi pada zona sub montana; sedangkan jenis-jenis pohon yang dominan dalam kawasan pada zona itu adalah Macropanax dispermum, Villebrunea rubescens, dan Castanopsis javanica.Kata kunci: Analisis vegetasi, flora berpotensi, Gunung Marapi, keragaman, Sumatera Barat Abstract. Nasution T, Iskandar EAP, Ismaini L. 2015. Diversity of potential flora and vegetation composition in Mount Marapi, West Sumatra. Pros Sem Nas Masy Biodiv Indon 1: 1334-1340.Mount Marapi is located in West Sumatra Province, one of the most active volcanoes in Sumatra Island. Marapi eruptions have been predicted to influence on vegetation composition. A study had been conducted to collect potential plants and to analysis vegetation composition in the area. We used survey method to collect potential flora by exploring the mount from altitude 1420 m to 2260 m above sea level. Belt transect method was conducted to analysis vegetation composition on sub-montane zone. We determined sampling plot using purposive sampling method. Around 151 species of plants had been collected, including 112 potential plants. We collected potential ornamental plants, including Rhododendron spp., Begonia spp., and Impatiens spp. It had also been collected potential plants for timber including Lithocarpus spp., Exbucklandia populnea, and Syzygium spp. Medicinal plants were recorded including Gaultheria spp., Gunnera macrophylla, dan Piperaceae. We also identified potential plants as food including Rubus spp., Zingiberaceae dan Smilax sp. Vegetation analysis on sub montane zone of Mount Marapi indicated that understorey plants were dominated by Ophiorriza sp., Elatostema sp., and Syzygium...

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