Aerofilum fasciculatum gen. nov., sp. nov. (Oculatellaceae) and Euryhalinema pallustris sp. nov. (Prochlorotrichaceae) isolated from an Indian mangrove forest Author Chakraborty, Sandeep 0000-0001-5393-0998 School of Environmental Studies, Jadavpur University, Kolkata 700 032, India & Department of Botany, Achhruram Memorial College, Jhalda, Purulia 723 202, India & sandeep 061192 @ gmail. com; https: // orcid. org / 0000 - 0001 - 5393 - 0998 sandeep061192@gmail.com Author Maruthanayagam, Veerabadhran 0000-0002-5378-6567 Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, 110 Xiangya Road, Changsha, Hunan, 410078, China & vvmaruth @ gmail. com; https: // orcid. org / 0000 - 0002 - 5378 - 6567 vvmaruth@gmail.com Author Achari, Anushree 0000-0001-8544-605X Indian Institute of Chemical Biology, Jadavpur, Kolkata 700 032, India & achari. anushree @ gmail. com; https: // orcid. org / 0000 - 0001 - 8544 - 605 X achari.anushree@gmail.com Author Pramanik, Arnab 0000-0002-7675-7339 Department of Biochemistry, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India & arnab. ju 9 @ gmail. com; https: // orcid. org / 0000 - 0002 - 7675 - 7339 arnab.ju9@gmail.com Author Jaisankar, Parasuraman 0000-0003-0583-4920 Indian Institute of Chemical Biology, Jadavpur, Kolkata 700 032, India & drpjaisankar @ gmail. com; https: // orcid. org / 0000 - 0003 - 0583 - 4920 drpjaisankar@gmail.com Author Mukherjee, Joydeep 0000-0001-5068-8112 School of Environmental Studies, Jadavpur University, Kolkata 700 032, India & joydeep. mukherjee @ jadavpuruniversity. in; https: // orcid. org / 0000 - 0001 - 5068 - 8112 joydeep.mukherjee@jadavpuruniversity.in text Phytotaxa 2021 2021-10-11 522 3 165 186 http://dx.doi.org/10.11646/phytotaxa.522.3.1 journal article 4081 10.11646/phytotaxa.522.3.1 b32a6a54-8293-489f-b190-cc87980234df 1179-3163 5560375 Aerofilum fasciculatum sp. nov. Chakraborty et Mukherjee Description Thallus blue-green, growth pattern appears like fascicles or bundles rather than forming a mat-like biofilm. Filaments isopolar, uniseriate, unbranched, cells slightly longer than their width, cell length ranged from 1.4 - 2.1 µm and width 0.9 - 1.1 µm. Cross walls have distinct constrictions. Trichomes were cylindrical, immotile, no heterocyte or akinete. Small sized filaments known as hormogonia helps in propagation. Necridic cells present. Ultrastructure includes parietal thylakoids, aerotopes present. Holotype (designated here): Holotype (AP3b) deposited and cryopreserved in the Microbial Culture Collection (MCC), India having accession number MCC 3478 . Type locality: Lothian island (21.39.1N 88.19.37E) of the Indian Sundarbans, India . Etymology: The specific epithet ‘fasciculatum’ reflects the growth pattern of the strain appearing to grow as a cluster or fascicles instead of forming a mat-like biofilm.