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SPIROGYRA 135<br />
END WALLS PLANE<br />
(one-) two to sixteen CHROMATOPHORES<br />
46. Spores globose, ovoid, or ellipsoid, not laterally com-<br />
pressed 47<br />
46. Spores globose, ovoid, or ellipsoid, laterally compressed 105<br />
47. Median spore wall smooth 48<br />
47. Median spore wall not smooth 75<br />
SPORES NOT LATERALLY COMPRESSED<br />
MEDIAN WALL SMOOTH<br />
48. Vegetative cells with less than 9 chromatophores 49<br />
48. Vegetative cells with more than 9 chromatophores. ... 71<br />
49. Fertile cells cylindric, or enlarged 50<br />
49. Fertile cells inflated 72<br />
50. Spores ellipsoid or cylindric-ellipsoid 51<br />
50. Spores ovoid or cylindric-ovoid, rarely globose 62<br />
51. Vegetative cells usually less than 45 /a in diameter 52<br />
51. Vegetative cells usually 45-60 /a in diameter 54<br />
51. Vegetative cells more than 60 /la in diameter 56<br />
52. Chromatophores 2 to 3 in each cell 53<br />
52. Chromatophores 2 to 4, diam-<br />
eter vegetative cells ju- 32-37 66. S. irregularis<br />
52. Chromatophores 3 in each cell. . 67. S.juellebornei<br />
52, Chromatophores 2 in each cell,<br />
spores iJi 2^7,2 X 51-61 ju, 68. 5. microspora<br />
52. Chromatophores 2 in each cell,<br />
spores 38-42 /x X 60-78 /x 69. 5, hollandiae<br />
53. Diameter vegetative cells 21-32 ^u, 70. S.submarina<br />
53. Diameter vegetative cells 36-41 /a 71. 5. rivularis<br />
53. Diameter vegetative cells 38-48 fi 72. 5. biformis<br />
54. Chromatophores, 3, 1-3, or 2-3 55<br />
54. Chromatophores 2-4 li-<br />
^- hyalina<br />
55. Chromatophores 3, diameter vegeta-<br />
tive cells 55-60 )U, 74-<br />
55. Chromatophores (i-)3, diameter veg-<br />
etative cells 48-54 i".<br />
55. Chromatophores 2 to 3, diameter veg-<br />
IS-<br />
'^- pseudoneglecta<br />
^- Columbiana<br />
etative cells 49-62 M 76. 5. angolensis<br />
56. Diameter vegetative cells between 60 and 80 /a<br />
57<br />
56. Diameter vegetative cells between 80 and 120 ix 60<br />
56. Diameter vegetative cells more than i20ju. 61
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