15 



39. Nodularia : (spumigera.) 



V,".i >..'.">■ '."!' '' 



Triohomata breviter artioulata; articuli comprcssi diseiformes ; sporae 

 (x, x, x) globosae vel compressae intcrjcctae, demum fuscae. 



40. Cylindrospermum : (macrospermum.) 



a. Spora oblonga singula ante cellulam terminalem (c.) ; b. cellulae 



vcgetativae. 



41. Sphaerozyga : (Carmichaelii.) 



Sporae (a. a.) cylindraceae, singulae inter cellulas interstitiales binas (b.). 



42. Limnochlide : (flos aquae.) 



6 



Sporae cylindraceae plus minus elongatae (b, c, d) ; a. cellulae 



vegetativae. 



Incertae sedis. 

 43. Chaetococcus : (violaceus.) 



Trichomata rigida, spiniformia , a substrato celluloso radiatim exeuntia. 



