Flora Desmidiarum Japonicarum IV

214 Minoru HIRANO: Flora Desmidiarum Japonicarum
Cellulae .parvae vel minutae, lateribus.utrobique spinis duabus, ad
angulos apicales,et laterales ordinatae.
Ia. Semicellulae rectangulares cum rnarginibus retusis, spinis longis .. A. octocornis
lb. 'Semicellulae depresso-he.xagonae, spinis minutis
............................................ A. bifidus var. truncatus f. suecisa
Arthrodesrrius octo'cornis EHRENB. in WoLLE Desm. U. S. 97, 1884; Roy &
BIssET Journ. Bot. 24, 196. 1886; HusTEDT Arch. Hydrobiol. 6, 336, 1911;SMITH Wisc. BulL
57, 134, 1924; KRrEGER Arch. Hydrobiol. suppl. 11, 192, 1932; OKADA Journ. Imp. Fish. Inst.
30, 179, 1934; HIRANo Jap Journ. Bot. 14, 229, 19[4.
Cellulae parvae, circiter lg-15 longiores 'quam latiores sine spinis,
profunde constrictae, sinu late aperto et fere semicirculari excavato;
semicellulae transverse trapeziformo-rectangulares, apicibus et marginibus
lateralibus omnibus concavis, angulis rotundis et cum spinis longis robustis
rectispraeditis; a vertice visae ellipticae, polis rotundis spinis praeditis.
Long. sine spin. 17-21.5pa, Lat. sine spin. 12-16.8pa, Lat. isth. 5-5.6p, Long.
spin. 9-10pa.
Hab. Hokkiido: Ch6bushi-numa in Nemuro; Kiritappu in Kushiro;
Toyokoro-konuma in Tokachi; Ytifutsu, Tomakomai in ' Iburi ; Shizukari in
Oshima: Hondo: Naga:numa of Mt. Hachimantai in Rikuchti; Koke-numa,
Hirumo-numa in Ugo; Oishitano-junsai-tsutsumi, Saigo-mura, Mt. Sugigamine
of Zawo in Uzen; Naga-numa, Kobuchi-numa in Rikuzen; Akaiyachi in
Iwashiro; Oze in K6zuke; Mt. Kirigamine in Shinano ; Kotsutsumi-nishi-ike,
Takashihara in Mikawa; Ishigaki-ike, J6do-ike, Toba in Ise; Nukigawa,
Shinohara-ike in Oorni; Mizoroga-ike in Yamashiro. (Pl, XXIX, f. 32)
Distr. Japan, Kuriles, Siberia, Mongolia, Burma, Ceylon, Sumatra, whole
Europe, Iceland, Greenland, N. America, Australia.
Arthrodesmus bifidus BREB. var. truncatus WEsT forma succisa W. &
G. S. WEST in Monogr. Brit. Desm. 4, 115. 1911.
Cellulae subhexagonales, apicibus et marginibus lateralibus superioribus
leviter retusis, sinu leviter rotundis ad apicem, spinis non praeditis. Long.
et Lat. 14pa, Lat. isth. 5pa.
Hab. Hondo: Kanori-ike in Shinano. (New to Asia) (Pl. XXIX, f. 11)
Distr. British Isles,
Sect. Diplocanthum sect. nov.
Cellulae parvae vel minutae, spinis duabus ad angulos aplcales utrobique
et spinis singulis in margine lateralis utrobique ordinatae.
Ia. Semicellulae cum angulis productis ordinatae; cellulae 321i in Iongitudinem
.........:.............................................................. Aimpar
lb. Semicellulae hexagonae, sine angulis productis ; cellulae 12-15pt in longitudinem.