Species [ var. trabecula ]: Vegetative cells cylindrical, 260-660 μm long, 24-45 μm diam., L/W=11-18, constricted at center, semicells bulged at base; chloroplast elongate, with 3-4 laminae; cell wall dotted.
[ var. rectum (Delponte) W. et G.S. West ]: Cell body thinner than var. trabecula, 180-493 μm long, 14-23 μm wide, L/W=12-18.
[ var. crassum Wittrock ]: Cell body shorter and wider than var. trabecula, 275-554 μm long, 30-57 μm wide, L/W=6-7 (not exceed 10).
[ var. elongatum Cedergren ]: Cell body longer than var. trabecula, 600-830 μm long, 30-40 μm wide, L/W=19-28.
[ var. maximum (Reinsch) Roll ]: Cell body 350-1120 μm long, 44-65 μm wide, L/W=8-17 (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. trabecula: Semicells only one bulge at their base (not wavy)
v. trabecula 612 x 41 μm 556 x 38 μm L/W=14.9,14.6 Takamatsu Kagawa, 2002	v. trabecula 596 x 39 μm L/W=15.3 Nagaike park Hachioji Tokyo, 2005	v. trabecula 580 x 32 μm L/W=18.1 Kannon-numa Shimogo Fukushima, 2005	v. trabecula 540 x 45 μm 570 x 35 μm L/W=12,16.3 Sanda Hyogo, 2001
v. trabecula 530 x 32 μm L/W=16.6 Numa-no-hara m. Madarao highland Niigata, 2005	v. trabecula 514 x 34 μm L/W=15.1 Sue-machi Fukuoka, 2001	v. trabecula 480 x 40 μm L/W=12.0 Saitama, 2001	v. trabecula 460 x 40 μm L/W=11.5 Univ. A.V.M. Obihiro Hokkaido, 2005
v. trabecula 454 x 30 μm L/W=15.1 Ichinose-enchi Norikura highland Nagano, 2005	v. trabecula 470 x 37 μm L/W=12.7 Kasama Park Ibaraki, 2002	v. trabecula 400 x 30 μm L/W=13.3 near Suga-daira m Ueda Nagano, 2006	v. trabecula 372 x 28 μm L/W=13.3 Murakuni ike Iwatsuki-bunka p. Saitama, 2006
v. trabecula ?? 452 x 35 μm L/W=12.9 Naruto-Togane Sanmu Chiba, 2006	v. trabecula 330 x 36 μm L/W=9.2 rice field Ichinoseki Iwate, 2005	v. trabecula or v. elongatum ? 580 x 32 μm 532 x 33 μm L/W=18.1, 16.1 Kowashimizu Suwa Nagano, 2005	v. trabecula 604 x 46 μm L/W=13.1 Maimeno-ike Norikura highland Nagano, 2006
v. trabecula 450 x μm L/W= n. Yamakado m. Nishi-Azai Shiga, 2008
var. trabecula: Semicells slightly wavy at the base
v. trabecula 640 x 38 μm L/W=16.8 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	v. trabecula 525 x 31 μm L/W=16.9 hairly or gelatinous Uruguay, 1999	P. trabecula 680 x 45 μm L/W=15.1 Tsukamoto Sakura-ku Saitama, 2004	P. trabecula 495 x 31 μm 544 x 38 μm L/W=16.0,14.3 hairly surface Japan, 1998
P. trabecula 525 x 38 μm L/W=13.8 hairs rare Japan, 1998	v. trabecula 496 x 31 μm L/W=16 Oyomi marsh Hakuba Nagano, 2004	v. trabecula or v. maximum ? 736 x 43 μm L/W=17.1 Kabuto-yama Nishi-no-miya Hyogo, 2004	P. trabecula or P. repandum ? 365 x 26 μm L/W=14.0 hairs rare Uruguay, 1999
v. trabecula 520 x 44 μm L/W=11.8 near Yamaguchi Univ. Yamaguchi, 2004	v. trabecula 474 x 21 μm L/W=22.6 Shibayachi m. Odate Akita, 2007
var. crassum: Shorter and wider than v. trabecula; L/W=6-7 (not exceed 10)
v. crassum 538 x 55 μm 566 x 48 μm 604 x 44 μm L/W=9.8,11.8,13.7 Gumma, 2001	v. crassum 530 x 50 μm 360 x 55 μm L/W=10.6,6.5 hairly surface USA, 1999	v. crassum ? 363 x 36 μm L/W=10.1 Uruguay, 1999	v. crassum 275 x 30 μm L/W=9.2 Higashi-sano Hakuba Nagano, 2004
var. rectum: Thinner than v. trabecula; 14-23 μm wide; L/W=12-18
v. rectum 308 x 17 μm L/W=18.1 Omine-numa Tsukiyono Gunma, 2003	v. rectum 255 x 17 μm L/W=15 near Akai wetland Aizuwakamatsu Fukushima, 2005	v. rectum 400 x 22 μm L/W=18.2 Hasu-ike Shiga highland Nagano, 2005	v. rectum 231 x 15 μm L/W=15.4 n. Yamakado m. Nishi-Azai Shiga, 2008
var. elongatum: Longer than v. trabecula; 30-40 μm wide; L/W=19-28
P. elongatum 606 x 35 μm 940 x 41 μm L/W=17.3,22.9 Komado marsh Showa and Tajima Fukushima, 2004	v. elongatum 545 x 27 μm L/W=20.2 hairly surface Japan, 1998	v. elongatum 525 x 29 μm L/W=18.1 hairly surface Saitama, 1999	v. elongatum 430 x 30 μm L/W=35.8 Aquatic botanical g. Sawara Chiba, 2004
v. elongatum 728 x 44 μm L/W=20.9 Naruto-Togane Sanmu Chiba, 2006	v. elongatum 700 x 39 μm L/W=17.9 smooth surface Kuroiso Tochigi, 2002	v. elongatum 600 x 30 μm L/W=20.0 Kejo-numa Furukawa Miyagi, 2003	v. elongatum 680 x 30 μm L/W=22.7 Imori pond Myoko highland Niigata, 2004
v. elongatum 584 x 22-27 μm L/W=21.6-26.5 Omine-numa Minakami Gunma, 2006	v. elongatum 720 x 30 μm L/W=24.0 Kareki-numa Nikko Tochigi, 2008	v. elongatum 460 x 18 μm L/W=25.6 Kashibaru m.2 Karatsu Saga, 2008	v. elongatum ? 390 x 20 μm L/W=19.5 Ohnuma Nasu-shiobara Tochigi, 2006

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