— 657 — 
tum coalita. — 21. Gen. Nostoc Vauch. cum Subgen. seu Sect. in Bor. 
et Flah. l. c, IV. p. 183. 
Xili. Trib. Nodularieae Hansg. in Notarisia, 1888, N. 12, p. 
587 sub 7. Subfam. ampi, adile : Trichomata plus minus paralleliter ag- 
gregata, in stratum peridermide propria non cinclum coalita. 
22. Gen. Anabaena (Bory) Ktz. adde : — 3. Subgen. Sphaerozyga 
(Ag.) Balfs [incl. Sphaerodermus Corda, 1839 sub gen.]. — 4. Subgen. 
Wollea (Bor. et Fiali.) L c. IV, p. 223 subgen. — 5. Subgen. Cylin- 
drospermum (Ktz.) Ra'fs in Bor. et Flah. IV, p. 249 sub gen. — 23. 
Gen. Nodularia Mert. 
7. Subfam. Aulosîreae Bor. et Flah. /. c. IV, p. 180. 
24. Gen. Aulosira Krch. — 64. Gen. Hormothamnion Grun. 
4. Fam. Lyngbyaceae (Thr.) Hansg. Jam cl. Fischer [Beitràge z. 
Kennlniss der Nostochaceeri, 1853, p. 12] familiam Oscillarieae Fis h. — 
Lyngbyaceae Nostochaceis (Gloeosipheis) adjunxit. 
Ad 25. Gen. Microcoleus Desmaz. pertinet Gen. Dasygloea Thw. conf. 
Wolle, Algae of the United States^ p. 304. 
27. Gen. Symploca (Ktz.) Rbh. — 1. Subgen. Symphyotlirix (Ktz.) 
Rabenhorst, Flora europ. alg. II, p. 153. — 2. Subgen. Eusymploca 
(Rbh. /. c. p. 154) Hansg. [Symploca Ktz.]. 
28. Gen. Lyngbya (Ag.) Thr. — 3. Subgen. Oscillaria (Bosc) Hansg. 
— 4. Subgen. Spirulina (Turp.) Zopf cui Gen. Ophiothrix Corda (Ahn. 
d. Carlsb. 1839, p. 217) (non Ophiothrix Nag. iii Kützing, Species alga- 
rum^ 1849, p. 237 = Ophiocytium Nag.) proximum. 
5. Fam. Limnoghlideae (Ktz. Phycolog. generalis, 1843, p. 203) 
Hansg. — 30. Gen. Aphanizomenon Morren non Thompson in Ann. a. 
mag. of nat. history, 1840, p. 83. — Bornet et Flahault L c. IV, 
p. 241 hoc genus ad Fam. Nostoceae referunt et gen. Anabaenae Bory pro- 
ximum esse putant (rpiia sporae iii intervalio helerocystarum formatae) ; 
Rails autem [On the Nostochineae, 1850, p. 331, 340] existentiam he- 
tcrocystarum in hoc genere negat, qua de causa auclor cum cl. Borzi 
genus Aphanhomenen et gen. Isocystis Bzi. ad Isocysteas Bzi. refert (1). 
(1) Etsi in quibiisdam formis sporiferis generis Aphanizomenon Mor- 
ren heterocystae invenientur (conf. Magnus, Berichte, d. deutsch. bot. GeselL 
Berlin, 1883, p. 130) hoc genus non solum heterocystarura inopia in mul- 
tis formis sporiferis, sed etiam organisatione sua propria ab omnibus No- 
stocaceis heterocystatis valde dissimile ad Fam. Limnochlideae (non ad 
Nostoceas) adnumeratum esse debet. 
