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130 ZYGNEMATACEAE
END WALLS PLANE
USUALLY ONE CHROMATOPHORE
3. Tubes evidently formed by projections from both gam-
etangia 4
3. Tubes formed wholly, or almost wholly, by the male gam-
etangia 117
4. Vegetative cells with i chromatophore (rarely in some
cells 2) 5
4. Vegetative cells usually with more than i chromatophore
(i-) 2-16 46
5. Median spore wall smooth (outer walls scrobiculate in Nos.
II, 40, and 41) 6
5. Median spore wall punctate, scrobiculate, reticulate, or ver-
rucose
6. Spores rather uniform (in optical section may appear
variable because seen at different angles in different
cells) 7
6. Spores distinctly polymorphic when seen from the same
angle (ellipsoid, ovoid, globose, and irregular) 33
7. Spores ellipsoid 9
7. Spores ovoid to cylindric-ovoid 24
7. Spores globose or compressed-globose 8
8. Spores compressed-globose, diam-
eter 55-65;^^ 152. S. discoidea
8. Spores globose, or compressed-
globose, diameter 85-95 /a i53- '^- sphaerospora
ONE CHROMATOPHORE
SPORES USUALLY ELLIPSOID, MEDIAN WALL SMOOTH
9. Sporangia cylindric, or enlarged 10
9. Sporangia inflated on both sides (larger than the spores) ... 19
9. Sporangia inflated mostly or only, on the conjugative side. .
35
14
9. Sporangia inflated mostly or only, on the outer side 23
10. Diameter vegetative cells less than 40/14 11
10. Diameter vegetative cells more
than 40/4, spore diameter 34-38/u. 6. S.condensata
10. Diameter vegetative cells more
than 40 /x, spore diameter ju. 42 or
more 7. 5. varijormis
10. Diameter vegetative cells more
than 60/1, spore diameter 60-66/1 33. S.gallica