P L A T E X X V I I .
Zygnema rivulare.
P L A T E X X V I I I .
Figs. 1 and 2. Zygnema quininum. — Figs. 3 and 4. Zygnema
cestivum. — Figs. 5 and 6. Zygnema commune.
P L A T E X X IX .
Zygnema varians.
P L A T E X X X .
Figs. la n d 2. Zygnema malformatum. — Figs. 3 and 4. Zyg-
\ema catenaforme. — Figs. 5 and 6. Zygnema gracile. —
Figs. 7 and 8. Zygnema parvum. — Figs. 9 and 10. Zygnema
flavescens.
P L A T E X X X I .
Figs. 1 and 2. Zygnema Grevilleanum. — Y\gs,. 3 and 4. Z yg nema
longatum.
P L A T E X X X I I .
Figs. 1 and 2. Zygnema inequale. — Figs. 3 and 4. Zygnema
^suhventricosum. — Fig. 5. Zygnema suhventricosum var. —
Figs. 6 and 7. Zygnema inflatum. — Fig. 8. Zygnema in-
flatum var. — Figs. 9 and 10. Zygnema tenuissimum.
P L A T E X X X I I I .
Fig. 1. Zygnema rostratum. — Y \g .‘¿. Zygnema Woodsii.—
Fig. 3. Zygnema rever sum.
P L A T E X X X IV .
Figs. 1, 2, 3. Zygnema angulare. — Fig. 4. Zygnema abbre-
%iatum. — F ig. 5. Zygnema malleola. — Fig. 6. Zygnema
affine.
P L A T E X X X V .
Zygnema mirabile.
P L A T E X X X V I .
Zygnema Hassallii.
P L A T E X X X V I I .
Figs. 1 and 2. Zygnema quadratum. — Fig. 3. Zygnema intermedium.
— F ig. 4. Zygnema diductum. — Fig. 5. Zygnema
vesicatum. — Fig. 6 and 9. Zygnema Jenneri.— Fig. 7.
Zygnema dubium. — Fig. 8. Zygnema minimum.
P L A T E X X X V I I I .
Fig. 1. Tyndaridea cruciata. — Figs. 2 and 3. Tyndaridea
anomala. — Fig. 4. Tyndaridea lutescens. — Fig. 5. T yn daridea
bicornis. — Figs. 6 and 7. Tyndaridea insignis. —
Fig. 8. Tyndaridea ovalis. — Fig. 10. Tyndaridea stag-
nalis. — Fig. 9. Tyndaridea stagnalis var. ?
P L A T E X X X IX .
Figs. 1 and 2. Tyndaridea conspicua. — Fig. 3. Tyndaridea
immersa. — Figs. 4 and 5. Tyndaridea Ralfsii. — Fig. 6.
Tyndaridea decussata.
P L A T E X L .
Fig. 1. Mougeotia major. — Fig. 2. Mougeotia yenuflexa.
P L A T E X L I.
Fig. 1. Zygogonium ericetorum in its terrestrial condition.
Fig. 2. Aquatic form of the same.
P L A T E X L I I .
Fig. 1. Mesocarpus scalaris.—Fig. 2. Mesocarpus scalarisvar.
P L A T E X L I I I .
Fig. 1. Mesocarpus intricatus. — Fig. 2. Mesocarpus recurvus.
P L A T F X L IV .
Fig. 1. Mesocarpus depressus. —^Fig. 2. Mesocarpus ovalis.