Order: Filamentous algae without branching; cell body mostly cylindrical.
Family: Cellwall shows H shape in transverse section; chloroplasts reticulatedwithout pyrenoids.
Genus: Same as family.

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Microspora sp. 52-80 x 25-30 μm Iruma river Kawagoe Saitama, 2004	Microspora sp. 27-54 x 30 μm Tama-gawa g.p. Fuchu Tokyo, 2004	Microspora sp. 46 x 30 μm Higusa-numa Hikari Chiba, 2006	Microspora sp. 43-65 x 25 μm Toneri Park 2 Adachi-ku Tokyo, 2006
Microspora sp. μm Water reservoir Ohira Tochigi, 2008	Microspora sp. 40-80 x 25 μm Hamayu-no-mori Izumo Shimane, 2006	Microspora sp. 24-48 x 25 μm Yanase river Tokorozawa Saitama, 2004	Microspora sp. 17-35 x 20 μm Kata-numa Narugo onsen Miyagi, 2006
Microspora sp. 15-20 x 17 μm Chigo-ike 4 Shiga highland Nagano, 2006
M. pachyderma: Cell body 6.6-13 μm in diam., length 1.3-3 times longer than witdh; H structure conspicuous, cell wall 1.5-2.5 μm in thickness
M. pachyderma 17 samples 8-28 x 11-14 μm 2005-2008	M. pachyderma 17 samples 8-28 x 11-14 μm 2005-2008	M. pachyderma 17 samples 8-28 x 11-14 μm 2005-2008	M. pachyderma 17 samples 8-28 x 11-14 μm 2005-2008
M. willeana: Cell body 10-12 μm in diam., length 13-18 μm;
M. willeana 8 samples 9-20 x 9-14 μm 2004-2007	M. willeana 8 samples 9-20 x 9-14 μm 2004-2007	M. willeana 8 samples 9-20 x 9-14 μm 2004-2007	M. willeana 8 samples 9-20 x 9-14 μm 2004-2007
M. tumidula: Cell body 8-9 μm in diam., length nearly equal to its width;
M. tumidula ? μm Komado marsh Showa and Tajima Fukushima, 2004	M. tumidula ? 6-7 x 8 μm Komado marsh Showa and Tajima Fukushima, 2004	M. tumidula ? 6-11 x 8 μm Kisuge konuma Shimogo Fukushima, 2005	M. tumidula ? 5-10 x 9 μm Onnenai Kushiro marsh Hokkaido, 2005
M. tumidula ? 6.5-13 x 8.5 μm Midoriga-ike Togakushi highland Nagano, 2006	M. tumidula ? x 8-9 μm Kuroyachi marsh Hachimantai Iwate, 2007	Microspora sp. ? 8-18 x 9 μm near Iroha-numa Zao mountain Yamagata, 2006
Microspora sp. 13-16 x 8 μm Numa-no-hara m. Madarao highland Niigata, 2005	Microspora sp. 16-20 x 9 μm Kusatsu Onsen b.t. Kusatsu Gunma, 2005	Microspora sp. 8-15 x 9 μm Karakemi marsh Yasaka Nagano, 2005	Microspora sp. 12-17 x 5-9 μm Karakemi marsh Yasaka Nagano, 2006
Microspora sp. 6-14 x 8.5 μm Iyari marsh Omachi Nagano, 2006
M. stagnorum: Cell body 5-7 μm in diam., length 1-3 times longer than witdh
M. stagnorum ? 15-19 x 7 μm Onnenai Kushiro marsh Hokkaido, 2005	M. stagnorum ? 4.5-9 x 7 μm Toyonodai park Otone Saitama, 2006	M. stagnorum ? 5-9 x 5.5 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005
??: Cell body narrower than 5 μm in diam.
Microspora sp. ? 4-9 x 4 μm Onnenai Kushiro marsh Hokkaido, 2005
Microspora or Geminella or ?
Microspora sp. or Geminella ? 4-8 x 7 μm Lake Nojiri Shinano Nagano, 2004	Microspora sp. or Geminella ? 6-7 x 8 μm Riverside green l. Sawara Chiba, 2004	Microspora sp. or Geminella ? 6-7 x 8 μm Numa-no-hara m. Madarao highland Niigata, 2005	Microspora sp. or Geminella ? 6-12 x 7 μm Tanohara Natural p. Ontake highland Nagano, 2005
Microspora sp. or Klebsormidium ? 9-18 x 7 μm Karakemi marsh Yasaka Nagano, 2006

Similar genera -->> Tribonema; Geminella; Cylindrocapsa;

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