Format: ORAL

Ludmilla F. Untari 1*, Dita Rahmadani2, Faiq I. Majid2, Juntria R. Khasanah2, Japareng Lulang3, Ari Satia Nugraha4

1) The Plant Systematics Laboratory, Department of Tropical Biology, Faculty of Biology, Universitas Gadjah Mada, Jl. Teknika Selatan, Sekip Utara, Yogyakarta 55281, Indonesia. 2) Department of Tropical Biology, Faculty of Biology, Universitas Gadjah Mada, Jl. Teknika Selatan, Sekip Utara, Yogyakarta 55281, Indonesia. 3) School of Industrial Technology, Universiti Sains Malaysia, Jalan Sungai 2, 11800 Gelugor, Pulau Pinang, Malaysia. 4) The Faculty of Pharmacy, University of Jember, Krajan Timur, Sumbersari, Kec. Sumbersari, Kabupaten Jember, Jawa Timur 68121, Indonesia. *Corresponding author: ludmilla.untari@ugm.mail.ac.id

Algae can be found in a variety of habitats, including terrestrial habitats. Chlorophytes are algae that are often found as the main component of terrestrial algal populations. Molecular data also explain that the diversity of terrestrial algae is much higher than the others. However, several problems in studying terrestrial algae make the study of terrestrial green algae challenging. As a result, it is difficult to find data on terrestrial green algae and their species diversity, especially in Indonesia. More research is needed on the diversity of terrestrial Chlorophyta species in Indonesia. Therefore, this research was conducted to determine the diversity of terrestrial Chlorophyta species in Indonesia, especially in the Yogyakarta Province. At the time of sampling, physicochemical parameters of the growth environment were also measured. The algae samples were examined under a light microscope and morphological identification was analysed. Diversity and Evenness Index were also calculated and presented. Species descriptions and identification keys of twenty-one species grouped into eleven families are reported here. This paper is the first report on terrestrial algae from Yogyakarta Province. The environmental factors such as temperature, humidity, wind speed and light intensity affect the growth and density of terrestrial algae. However, each species has different tolerance to these environmental factors.