xiv ZYGNEMATACEAE 



Plate Page 



XXIV. Spirogyra 292 



XXV. Spirogyra 294 



XXVI. Spirogyra 296 



XXVII. Spirogyra 298 



XXVIII. spirogyra 300 



XXIX. Spirogyra 302 



XXX. Spirogyra 304 



XXXI. Spirogyra 306 



XXXII. Spirogyra 308 



XXXIII. Spirogyra 310 



XXXIV. Spirogyra 312 



XXXV. Spirogyra 314 



XXXVI. Spirogyra 316 



XXXVII. Spirogyra 318 



XXXVIII. Spirogyra 320 



XXXIX. spirogyra 322 



XL. Sirogonium 324 



XLI. Zygogonium, Zygnema, and Spirogyra 326 



Illustrations in Text 



Figure Page 



A Zygnema ellipsoideum 44 



B-C Zygnema mirificum 44 



D-E Zygnema l{hannae 45 



F Spirogyra crassa 193 



G Sirogonium sticticum 233 



H-K Sirogonium phacosporum 236 



