Subtribus 8. 
_ Ba 
eystis basilaribus: 9. Desmonema 
Berk. et Thwait. 
Cystocoleae Hansg. Fila saepius 
pluria vel bina, in vagina communi 
inclusa, submoniliformia; heterocystis 
intercalaribus. 10. Hydrocoryne 
Schwabe. 
Subtribus 9. DiplocoloneaeHansg. Fila repetite 
pseudoramosa, in vagina communi plu- 
ria, flexuoso curvata, subnostochacea; 
pseudoramis in intervallum hetero- 
cystarum, rarius sub heterocystis 
egredientibus 11. Diplocolon Näg. 
Fam. 2. Rivulariaceae (Stiz.) Rabh. 
Subfam. 3. 
Tribus 5. 
Tribus 6. 
Subfam. 4. 
Tribus 7. 
Tribus 8. 
Subfam. 5. 
Fam. 3. 
Subfam. 6. 
Subfam. 7. 
Rivularieae Kiz. 
Eurivularieae Born. et Flah. 12. Isac- 
&is Thur.,; 13. Zirvularia (Rabh.) Ag.; 
14. Gloeotrichta J. Ag. 
Brachytrichieae Bor. et Flah. 15. Bra- 
chytrichia Zanard. 
Mastichotrichieae Ktz. 
Eucalotricheae Hansg. Fila ramosa, 
vaginis firmis, arctis, fills subeylindrieis: 
16. Calothrüx Ag. (Subg.: Homoeothrix 
Born. et Flah.; Euealothrex Born. et Flah.; 
Dichothrix |Born. et Flah.]; Polythrix 
|Born. et Flah.]). 
Sacconemeae Hansg. Vaginae filo- 
rum gelatinosae saccato-ampliatae, filis 
moniliformibus: 17. Sacconema Bai. 
Leptochaeteae Born. et Flah.: 18. Lepto- 
chaete Bzi.: 19. Amphithrix (Ktz.) Born, et 
Flah.; 20. Mecrochaete Thur. 
Nostoceae Bzi. 
Eunostoceae Hansg. Trichomata flexu- 
0so -curvata, submoniliformia, vaginis gela- 
tinosis vel indistinctis, cellulis vegetativis 
globosis, oblongis, subquadrangularibus, 
subeylindraceis rarius depresso-quadratis: 
21. Nostoc Vauch.; 22. Andbaena (Bory.) 
Ktz. (Subg.: Trechormus |Allm.|; Dolicho- 
spermum Thwait; Sphaerozyga [Ag.]; 
Uylindrospermum |Ktz.]) 
Nodularieae Hansg.: Fila subrecta vel 
leviter flexuosa, vaginis membranaceis vel 
mucosis, cellulis vegetativis subeylindrieis, 
