Flora Desmidiarum Japonicarum IV

204 Minoru HIRANo: Flora Desmidiarum Japonicarum
Subgen. Nothocosmarium RAclB.
Cosmarium subgen. Nothocosmarium Pamietn. Wydz. Um. Krakow 98, 1889.
Cellulae quadratae, modice constrictae, in latere visae asymmetricae, a
vertice visae semicirculares vel semiellipticae.
Species unica ............................................ C. obliquum forma tatrica
Cosmarium obliquum NORDsT. forma tatrica GUTW. in MEssiKoMMER Viertelj.
Naturf. Ges. Zurich 80, 48, 1935; Hl]IANO Bot. Mag. 66, 205, 1953. Cosmariutn abliquum
NoRDsT. in ALI.oRctE Rev. Alg• 5, 357, 1930; KosslNsKAJA AcU Inst. Bot. Acad. Sci. URSS.
PI. Crypt. 2, 84, 1934; PREscoT'r Pap. Mich. Acad• Sci. 21, 137, 1936; INsAM & KRIEGER
Hedw. 76, 103, 1937.
Forma marginibus lateralibus valide retusis, angulis basalibus rotundioribus,
in parte superiore semicellularum latioribus quam in inferioribus,
apicibus leviter retusis. Long. 14-27pa, Lat. 12-20p, Lat. isth. 10-14pa.
Hab. Hokkaido: Kamikoshi-ukishimahara, Mt. Daisetsu in Ishikari.
Hondo: Mt. Hakkoda, Mt. Hachimantai in Mutsu; Mt. Kurikoma, Yatsumanako
of Mt. Iwate in Rikucha; Mt. Komagatake in Ugo; Mt.
Gassan, Mt. Azuma, Sugigamine of Mt. Zawo in Uzen; Ayamedaira of
Oze in K6zuke; Sennin-ike, Mt. Tateyama, Mt. Eboshi, Tarobei-daira,
Kurnonotaira in Etchfi; Happ6-ridge, Tengunohara, Kazafuki-koshiki-ike,
Shigak6gen in Shinano; Sawano•ike in Yamashiro. Kiushiu: Koshiki-ike of
Mt. Kirishima in Hiuga. (Pl. XXVIII, f. 39)
Distr. Japan, Europe, N. America.
Arthrodesmus EHRENB.
RALFS Brit. Desm. 117, 1848; RABENfloRsT FIor. Europ. Alg. III, 225, 1868; WEsT Monogr.
Brit. Desm. 4, 88, 1911 ; SMITH Wisc. Bult. 57, 125, 1924 ; W".sT & FRITsCH Treat. Brit. Alg.
280, 1927;P! INTZ in ENGLER's Pflanzenfam. 3. 356, 1927;SMITH Freshw. Alg. U. S. 584, 19. 33.
Cellulae parvae aliquando minutae generaliter tam longae quam latae
sine spinis, conspicue et profunde constrictae, sinu generaliter aperto, raro
lineari ; semicellulae in fronte visis generaliter obverse triangulares aliquando
ellipticae, subquadratae, trapeziformes cum spinis simplicibus rectis vel
curvatis ad angulos praeditae, earumque in centro planae glabrae non
differentiatae ; a vertice visae generaliter ellipticae spinis ad polos praeditae ;
membrana unius crassata et sine quolibet ornamento; chromatophoris
axialibus cum pyrenoidibus in unaquaque semicellula ; zygosporae globosae,
membrana glabra vel cum spinis simplicibus praedita.
Ia. Ce!lulae spinis singulis ad angulos apicales ordinatae.
2a. Cellulae sine spinis in margine lateralis utrobique ........ Sect. Tetracanthum
2b. Cellulae cum spinis singtilis in margine lateralis utrobique . . Sects Octacanthurn